Articles | Volume 9, issue 1
https://doi.org/10.5194/amt-9-93-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/amt-9-93-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
18 Jan 2016
Research article |
| 18 Jan 2016
Mesospheric gravity wave characteristics and identification of their sources around spring equinox over Indian low latitudes
M. Sivakandan
National Atmospheric Research Laboratory (NARL), Gadanki,
517112, India
I. Paulino
Universidade Federal de Campina Grande (UFCG), Campina
Grande, Brazil
National Atmospheric Research Laboratory (NARL), Gadanki,
517112, India
now at: National Remote Sensing Center (NRSC), Hyderabad,
500037, India
K. Niranjan
Department of Physics, Andhra University, Visakhapatnam,
530003, India
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A. F. Medeiros, I. Paulino, M. J. Taylor, J. Fechine, H. Takahashi, R. A. Buriti, L. M. Lima, and C. M. Wrasse
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N. Parihar and A. Taori
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This study investigates the long-distance propagation (~ 1200–2000km) of gravity waves in the Indian subcontinent using coordinated nightglow measurements at Allahabad and Gadanki (separated by ~ 12º latitude). On few occasions, an identical wave (period in range ~ 2.2–4.5h) was seen at both sites that shared a common source. Waves had large horizontal wavelength (~ 1194–2746km) and phase speed (77–331m/s). The m2 profile analysis suggests the ducted propagation of the common waves.
M. Pramitha, M. Venkat Ratnam, A. Taori, B. V. Krishna Murthy, D. Pallamraju, and S. Vijaya Bhaskar Rao
Atmos. Chem. Phys., 15, 2709–2721, https://doi.org/10.5194/acp-15-2709-2015, https://doi.org/10.5194/acp-15-2709-2015, 2015
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Sources and propagation characteristics of high-frequency gravity waves observed in the mesosphere using airglow emissions from Gadanki and Hyderabad, India, are investigated using reverse ray tracing. Wave amplitudes are also traced back, including both radiative and diffusive damping. Interestingly, large vertical shears in the horizontal wind are noticed near the ray terminal points (at 10-12km altitude) and are thus identified to be the source for generating the observed gravity waves.
M. Sivakandan, D. Kapasi, and A. Taori
Ann. Geophys., 32, 967–974, https://doi.org/10.5194/angeo-32-967-2014, https://doi.org/10.5194/angeo-32-967-2014, 2014
D. P. Nade, A. K. Sharma, S. S. Nikte, P. T. Patil, R. N. Ghodpage, M. V. Rokade, S. Gurubaran, A. Taori, and Y. Sahai
Ann. Geophys., 31, 2077–2084, https://doi.org/10.5194/angeo-31-2077-2013, https://doi.org/10.5194/angeo-31-2077-2013, 2013
N. Parihar, A. Taori, S. Gurubaran, and G. K. Mukherjee
Ann. Geophys., 31, 197–208, https://doi.org/10.5194/angeo-31-197-2013, https://doi.org/10.5194/angeo-31-197-2013, 2013
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We study how the spectral characteristics of a solid-state laser in an atmospheric temperature profiling lidar using the Raman technique impact the temperature retrieval accuracy. We find that the spectral widening, with respect to a seeded laser, has virtually no impact, while crystal-rod temperature variations in the laser must be kept within a range of 1 K for the uncertainty in the atmospheric temperature below 1 K. The study is carried out through spectroscopy simulations.
Robert Reichert, Natalie Kaifler, and Bernd Kaifler
Atmos. Meas. Tech., 17, 4659–4673, https://doi.org/10.5194/amt-17-4659-2024, https://doi.org/10.5194/amt-17-4659-2024, 2024
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Imagine you want to determine how quickly the pitch of a passing ambulance’s siren changes. If the vehicle is traveling slowly, the pitch changes only slightly, but if it is traveling fast, the pitch also changes rapidly. In a similar way, the wind in the middle atmosphere modulates the wavelength of atmospheric gravity waves. We have investigated the question of how strong the maximum wind may be so that the change in wavelength can still be determined with the help of wavelet transformation.
Qiang Guo, Yuning Liu, Xin Wang, and Wen Hui
Atmos. Meas. Tech., 17, 4613–4627, https://doi.org/10.5194/amt-17-4613-2024, https://doi.org/10.5194/amt-17-4613-2024, 2024
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Non-linearity (NL) correction is a critical procedure to guarantee that the calibration accuracy of a spaceborne sensor approaches a reasonable level. Different from the classical method, a new NL correction method for a spaceborne Fourier transform spectrometer is proposed. To overcome the inaccurate linear coefficient from two-point calibration influencing NL correction, an iteration algorithm is established that is suitable for NL correction of both infrared and microwave sensors.
Yuanxin Pan, Grzegorz Kłopotek, Laura Crocetti, Rudi Weinacker, Tobias Sturn, Linda See, Galina Dick, Gregor Möller, Markus Rothacher, Ian McCallum, Vicente Navarro, and Benedikt Soja
Atmos. Meas. Tech., 17, 4303–4316, https://doi.org/10.5194/amt-17-4303-2024, https://doi.org/10.5194/amt-17-4303-2024, 2024
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Crowdsourced smartphone GNSS data were processed with a dedicated data processing pipeline and could produce millimeter-level accurate estimates of zenith total delay (ZTD) – a critical atmospheric variable. This breakthrough not only demonstrates the feasibility of using ubiquitous devices for high-precision atmospheric monitoring but also underscores the potential for a global, cost-effective tropospheric monitoring network.
Almudena Velázquez Blázquez, Edward Baudrez, Nicolas Clerbaux, and Carlos Domenech
Atmos. Meas. Tech., 17, 4245–4256, https://doi.org/10.5194/amt-17-4245-2024, https://doi.org/10.5194/amt-17-4245-2024, 2024
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The Broadband Radiometer measures shortwave and total-wave radiances filtered by the spectral response of the instrument. To obtain unfiltered solar and thermal radiances, the effect of the spectral response needs to be corrected for, done within the BM-RAD processor. Errors in the unfiltering are propagated into fluxes; thus, accurate unfiltering is required for their proper estimation (within BMA-FLX). Unfiltering errors are estimated to be <0.5 % for the shortwave and <0.1 % for the longwave.
Qihou Zhou, Yanlin Li, and Yun Gong
Atmos. Meas. Tech., 17, 4197–4209, https://doi.org/10.5194/amt-17-4197-2024, https://doi.org/10.5194/amt-17-4197-2024, 2024
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We discuss several robust estimators to compute the variance of a normally distributed random variable to deal with interference. Compared to rank-based estimators, the methods based on the geometric mean are more accurate and are computationally more efficient. We apply three robust estimators to incoherent scatter power and velocity processing, along with the traditional sample mean estimator. The best estimator is a hybrid estimator that combines the sample mean and a robust estimator.
Zhao Shi, Yuxiang Wen, and Jianxin He
Atmos. Meas. Tech., 17, 4121–4135, https://doi.org/10.5194/amt-17-4121-2024, https://doi.org/10.5194/amt-17-4121-2024, 2024
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The squall line is a type of convective system. Squall lines are often associated with damaging weather, so identifying and tracking squall lines plays an important role in early meteorological disaster warnings. A clustering-based method is proposed in this article. It can identify the squall lines within the radar scanning range with an accuracy rate of 95.93 %. It can also provide the three-dimensional structure and movement tracking results for each squall line.
Elizabeth N. Smith and Jacob T. Carlin
Atmos. Meas. Tech., 17, 4087–4107, https://doi.org/10.5194/amt-17-4087-2024, https://doi.org/10.5194/amt-17-4087-2024, 2024
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Boundary-layer height observations remain sparse in time and space. In this study we create a new fuzzy logic method for synergistically combining boundary-layer height estimates from a suite of instruments. These estimates generally compare well to those from radiosondes; plus, the approach offers near-continuous estimates through the entire diurnal cycle. Suspected reasons for discrepancies are discussed. The code for the newly presented fuzzy logic method is provided for the community to use.
Lev D. Labzovskii, Gerd-Jan van Zadelhoff, David P. Donovan, Jos de Kloe, L. Gijsbert Tilstra, Ad Stoffelen, Damien Josset, and Piet Stammes
EGUsphere, https://doi.org/10.5194/egusphere-2024-1926, https://doi.org/10.5194/egusphere-2024-1926, 2024
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The Atmospheric Laser Doppler Instrument (ALADIN) on the Aeolus satellite was the first of its kind to measure high-resolution vertical profiles of aerosols and cloud properties from space. We present an algorithm, producing Aeolus lidar surface returns (LSR) containing useful information for measuring UV reflectivity. Aeolus LSR matched well with existing UV reflectivity data from other satellites like GOME-2 and TROPOMI and demonstrated excellent sensitivity to modelled snow cover.
Laura Bianco, Bianca Adler, Ludovic Bariteau, Irina V. Djalalova, Timothy Myers, Sergio Pezoa, David D. Turner, and James M. Wilczak
Atmos. Meas. Tech., 17, 3933–3948, https://doi.org/10.5194/amt-17-3933-2024, https://doi.org/10.5194/amt-17-3933-2024, 2024
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The Tropospheric Remotely Observed Profiling via Optimal Estimation physical retrieval is used to retrieve temperature and humidity profiles from various combinations of passive and active remote sensing instruments, surface platforms, and numerical weather prediction models. The retrieved profiles are assessed against collocated radiosonde in non-cloudy conditions to assess the sensitivity of the retrievals to different input combinations. Case studies with cloudy conditions are also inspected.
Björn Linder, Peter Preusse, Qiuyu Chen, Ole Martin Christensen, Lukas Krasauskas, Linda Megner, Manfred Ern, and Jörg Gumbel
Atmos. Meas. Tech., 17, 3829–3841, https://doi.org/10.5194/amt-17-3829-2024, https://doi.org/10.5194/amt-17-3829-2024, 2024
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The Swedish research satellite MATS (Mesospheric Airglow/Aerosol Tomography and Spectroscopy) is designed to study atmospheric waves in the mesosphere and lower thermosphere. These waves perturb the temperature field, and thus, by observing three-dimensional temperature fluctuations, their properties can be quantified. This pre-study uses synthetic MATS data generated from a general circulation model to investigate how well wave properties can be retrieved.
Gia Huan Pham, Shu-Chih Yang, Chih-Chien Chang, Shu-Ya Chen, and Cheng Yung Huang
Atmos. Meas. Tech., 17, 3605–3623, https://doi.org/10.5194/amt-17-3605-2024, https://doi.org/10.5194/amt-17-3605-2024, 2024
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This research examines the characteristics of low-level GNSS radio occultation (RO) refractivity bias over ocean and land and its dependency on the RO retrieval uncertainty, atmospheric temperature, and moisture. We propose methods for estimating the region-dependent refractivity bias. Our methods can be applied to calibrate the refractivity bias under different atmospheric conditions and thus improve the applications of the GNSS RO data in the deep troposphere.
Sanja Dmitrovic, Johnathan W. Hair, Brian L. Collister, Ewan Crosbie, Marta A. Fenn, Richard A. Ferrare, David B. Harper, Chris A. Hostetler, Yongxiang Hu, John A. Reagan, Claire E. Robinson, Shane T. Seaman, Taylor J. Shingler, Kenneth L. Thornhill, Holger Vömel, Xubin Zeng, and Armin Sorooshian
Atmos. Meas. Tech., 17, 3515–3532, https://doi.org/10.5194/amt-17-3515-2024, https://doi.org/10.5194/amt-17-3515-2024, 2024
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This study introduces and evaluates a new ocean surface wind speed product from the NASA Langley Research Center (LARC) airborne High-Spectral-Resolution Lidar – Generation 2 (HSRL-2) during the NASA ACTIVATE mission. We show that HSRL-2 surface wind speed data are accurate when compared to ground-truth dropsonde measurements. Therefore, the HSRL-2 instrument is able obtain accurate, high-resolution surface wind speed data in airborne field campaigns.
Almudena Velázquez Blázquez, Carlos Domenech, Edward Baudrez, Nicolas Clerbaux, Carla Salas Molar, and Nils Madenach
EGUsphere, https://doi.org/10.5194/egusphere-2024-1539, https://doi.org/10.5194/egusphere-2024-1539, 2024
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This paper focuses on the BMA-FLX processor, in which thermal and solar top-of-atmosphere radiative fluxes are obtained from longwave and shortwave radiances measured along-track by the EarthCARE Broadband Radiometer (BBR). The BBR measurements, at three fixed viewing angles (fore, nadir, aft) are co-registered either at the surface or at a reference level. A combined flux from the three BRR views is obtained. The algorithm has been successfully validated against test scenes.
Laura M. Tomkins, Sandra E. Yuter, and Matthew A. Miller
Atmos. Meas. Tech., 17, 3377–3399, https://doi.org/10.5194/amt-17-3377-2024, https://doi.org/10.5194/amt-17-3377-2024, 2024
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We have created a new method to better identify enhanced features in radar data from winter storms. Unlike the clear-cut features seen in warm-season storms, features in winter storms are often fuzzier with softer edges. Our technique is unique because it uses two adaptive thresholds that change based on the background radar values. It can identify both strong and subtle features in the radar data and takes into account uncertainties in the detection process.
Bernat Puigdomènech Treserras and Pavlos Kollias
EGUsphere, https://doi.org/10.5194/egusphere-2024-1546, https://doi.org/10.5194/egusphere-2024-1546, 2024
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The manuscript presents a comprehensive approach to improve the geolocation accuracy of spaceborne radar and lidar systems, crucial for the successful interpretation of data from the upcoming EarthCARE mission. The manuscript details the technical background of the presented methods and various examples of geolocation analysis, including a short period of CloudSat observations when the star tracker was not operating properly and lifetime statistics from the CloudSat and CALIPSO missions.
Eileen Päschke and Carola Detring
Atmos. Meas. Tech., 17, 3187–3217, https://doi.org/10.5194/amt-17-3187-2024, https://doi.org/10.5194/amt-17-3187-2024, 2024
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Little noise in radial velocity Doppler lidar measurements can contribute to large errors in retrieved turbulence variables. In order to distinguish between plausible and erroneous measurements we developed new filter techniques that work independently of the choice of a specific threshold for the signal-to-noise ratio. The performance of these techniques is discussed both by means of assessing the filter results and by comparing retrieved turbulence variables versus independent measurements.
Luuk D. van der Valk, Miriam Coenders-Gerrits, Rolf W. Hut, Aart Overeem, Bas Walraven, and Remko Uijlenhoet
Atmos. Meas. Tech., 17, 2811–2832, https://doi.org/10.5194/amt-17-2811-2024, https://doi.org/10.5194/amt-17-2811-2024, 2024
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Microwave links, often part of mobile phone networks, can be used to measure rainfall along the link path by determining the signal loss caused by rainfall. We use high-frequency data of multiple microwave links to recreate commonly used sampling strategies. For time intervals up to 1 min, the influence of sampling strategies on estimated rainfall intensities is relatively little, while for intervals longer than 5–15 min, the sampling strategy can have significant influences on the estimates.
Martin Lainer, Killian P. Brennan, Alessandro Hering, Jérôme Kopp, Samuel Monhart, Daniel Wolfensberger, and Urs Germann
Atmos. Meas. Tech., 17, 2539–2557, https://doi.org/10.5194/amt-17-2539-2024, https://doi.org/10.5194/amt-17-2539-2024, 2024
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This study uses deep learning (the Mask R-CNN model) on drone-based photogrammetric data of hail on the ground to estimate hail size distributions (HSDs). Traditional hail sensors' limited areas complicate the full HSD retrieval. The HSD of a supercell event on 20 June 2021 is retrieved and contains > 18 000 hailstones. The HSD is compared to automatic hail sensor measurements and those of weather-radar-based MESHS. Investigations into ground hail melting are performed by five drone flights.
Bianca Adler, David D. Turner, Laura Bianco, Irina V. Djalalova, Timothy Myers, and James M. Wilczak
EGUsphere, https://doi.org/10.5194/egusphere-2024-714, https://doi.org/10.5194/egusphere-2024-714, 2024
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Profiles of temperature and humidity in the atmospheric boundary layer can be retrieved from passive ground-based remote sensors such as microwave radiometers and infrared spectrometers. In this work, we present improvements to the optimal estimation physical retrieval framework TROPoe, which increase the availability of retrieved profiles and temporal consistency and enhance the value of TROPoe for the study of atmospheric processes.
Andreas Foth, Moritz Lochmann, Pablo Saavedra Garfias, and Heike Kalesse-Los
EGUsphere, https://doi.org/10.5194/egusphere-2024-919, https://doi.org/10.5194/egusphere-2024-919, 2024
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Microwave radiometers are usually not able to provide atmospheric quantities such as temperature profiles during rain. Here, we present a method based on a selection of specific frequencies and elevation angles from the microwave radiometer observation. A comparison with a numerical weather prediction model shows that the presented method allows to resolve temperature profiles during rain with rain rates up to 2 mm h−1 which was not possible before with state-of-the-art retrievals.
Andrea Camplani, Daniele Casella, Paolo Sanò, and Giulia Panegrossi
Atmos. Meas. Tech., 17, 2195–2217, https://doi.org/10.5194/amt-17-2195-2024, https://doi.org/10.5194/amt-17-2195-2024, 2024
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The paper describes a new machine-learning-based snowfall retrieval algorithm for Advanced Technology Microwave Sounder observations developed to retrieve high-latitude snowfall events. The main novelty of the approach is the radiometric characterization of the background surface at the time of the overpass, which is ancillary to the retrieval process. The algorithm shows a unique capability to retrieve snowfall in the environmental conditions typical of high latitudes.
Lusheng Liang, Wenying Su, Sergio Sejas, Zachary Eitzen, and Norman G. Loeb
Atmos. Meas. Tech., 17, 2147–2163, https://doi.org/10.5194/amt-17-2147-2024, https://doi.org/10.5194/amt-17-2147-2024, 2024
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This paper describes an updated process to obtain unfiltered radiation from CERES satellite instruments by incorporating the most recent developments in radiative transfer modeling and ancillary input datasets (e.g., realistic representation of land surface radiation and climatology of surface temperatures and aerosols) during the past 20 years. The resulting global mean of instantaneous SW and LW fluxes is changed by less than 0.5 W m−2 with regional differences as large as 2.0 W m−2.
Maximilian Graf, Andreas Wagner, Julius Polz, Llorenç Lliso, José Alberto Lahuerta, Harald Kunstmann, and Christian Chwala
Atmos. Meas. Tech., 17, 2165–2182, https://doi.org/10.5194/amt-17-2165-2024, https://doi.org/10.5194/amt-17-2165-2024, 2024
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Commercial microwave links (CMLs) can be used for rainfall retrieval. The detection of rainy periods in their attenuation time series is a crucial processing step. We investigate the usage of rainfall data from MSG SEVIRI for this task, compare this approach with existing methods, and introduce a novel combined approach. The results show certain advantages for SEVIRI-based methods, particularly for CMLs where existing methods perform poorly. Our novel combination yields the best performance.
Lieuwe G. Tilstra, Martin de Graaf, Victor J. H. Trees, Pavel Litvinov, Oleg Dubovik, and Piet Stammes
Atmos. Meas. Tech., 17, 2235–2256, https://doi.org/10.5194/amt-17-2235-2024, https://doi.org/10.5194/amt-17-2235-2024, 2024
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This paper introduces a new surface albedo climatology of directionally dependent Lambertian-equivalent reflectivity (DLER) observed by TROPOMI on the Sentinel-5 Precursor satellite. The database contains monthly fields of DLER for 21 wavelength bands at a relatively high spatial resolution of 0.125 by 0.125 degrees. The anisotropy of the surface reflection is handled by parameterisation of the viewing angle dependence.
Bing Cao and Alan Z. Liu
Atmos. Meas. Tech., 17, 2123–2146, https://doi.org/10.5194/amt-17-2123-2024, https://doi.org/10.5194/amt-17-2123-2024, 2024
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A narrow-band sodium lidar measures atmospheric waves but is limited to vertical variations. We propose to utilize phase shifts among observations from different laser beams to derive horizontal wave information. Two gravity wave packets were identified by this method. Both waves were found to interact with thin evanescent layers, partially reflected, but transmitted energy to higher altitudes. The method can detect more medium-frequency gravity waves for similar lidar systems worldwide.
Thomas Hocking, Thorsten Mauritsen, and Linda Megner
EGUsphere, https://doi.org/10.5194/egusphere-2024-356, https://doi.org/10.5194/egusphere-2024-356, 2024
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The imbalance between the energy the Earth absorbs from the Sun and the energy the Earth emits back to space gives rise to climate change, but measuring the small imbalance is challenging. We simulate satellites in various orbits to investigate how well they sample the imbalance, and find that the best option is to combine at least two satellites that see complementary parts of the Earth and cover the daily and annual cycles. This information is useful when planning future satellite missions.
Xiaozhen Xiong, Xu Liu, Robert Spurr, Ming Zhao, Qiguang Yang, Wan Wu, and Liqiao Lei
Atmos. Meas. Tech., 17, 1965–1978, https://doi.org/10.5194/amt-17-1965-2024, https://doi.org/10.5194/amt-17-1965-2024, 2024
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The term “hotspot” refers to the sharp increase in reflectance occurring when incident (solar) and reflected (viewing) directions coincide in the backscatter direction. The accurate simulation of hotspot directional signatures is important for many remote sensing applications, but current models typically require large values of computations to represent the hotspot accurately. This paper provides a numerically improved hotspot BRDF model that converges much faster and is used in VLIDORT.
Daniel Zawada, Kimberlee Dubé, Taran Warnock, Adam Bourassa, Susann Tegtmeier, and Douglas Degenstein
Atmos. Meas. Tech., 17, 1995–2010, https://doi.org/10.5194/amt-17-1995-2024, https://doi.org/10.5194/amt-17-1995-2024, 2024
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There remain large uncertainties in long-term changes of stratospheric–atmospheric temperatures. We have produced a time series of more than 20 years of satellite-based temperature measurements from the OSIRIS instrument in the upper–middle stratosphere. The dataset is publicly available and intended to be used for a better understanding of changes in stratospheric temperatures.
Natalie E. Theeuwes, Janet F. Barlow, Antti Mannisenaho, Denise Hertwig, Ewan O'Connor, and Alan Robins
EGUsphere, https://doi.org/10.5194/egusphere-2024-937, https://doi.org/10.5194/egusphere-2024-937, 2024
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A doppler lidar was placed in highly built-up area in London to measure wakes from tall buildings during a period of one year. We were able to detect wakes and assess their dependence on wind speed, wind direction, and atmospheric stability.
Alban Philibert, Marie Lothon, Julien Amestoy, Pierre-Yves Meslin, Solène Derrien, Yannick Bezombes, Bernard Campistron, Fabienne Lohou, Antoine Vial, Guylaine Canut-Rocafort, Joachim Reuder, and Jennifer K. Brooke
Atmos. Meas. Tech., 17, 1679–1701, https://doi.org/10.5194/amt-17-1679-2024, https://doi.org/10.5194/amt-17-1679-2024, 2024
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We present a new algorithm, CALOTRITON, for the retrieval of the convective boundary layer depth with ultra-high-frequency radar measurements. CALOTRITON is partly based on the principle that the top of the convective boundary layer is associated with an inversion and a decrease in turbulence. It is evaluated using ceilometer and radiosonde data. It is able to qualify the complexity of the vertical structure of the low troposphere and detect internal or residual layers.
Kamil Mroz, Alessandro Battaglia, and Ann M. Fridlind
Atmos. Meas. Tech., 17, 1577–1597, https://doi.org/10.5194/amt-17-1577-2024, https://doi.org/10.5194/amt-17-1577-2024, 2024
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In this study, we examine the extent to which radar measurements from space can inform us about the properties of clouds and precipitation. Surprisingly, our analysis showed that the amount of ice turning into rain was lower than expected in the current product. To improve on this, we came up with a new way to extract information about the size and concentration of particles from radar data. As long as we use this method in the right conditions, we can even estimate how dense the ice is.
Wolf Knöller, Gholamhossein Bagheri, Philipp von Olshausen, and Michael Wilczek
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2023-184, https://doi.org/10.5194/amt-2023-184, 2024
Revised manuscript accepted for AMT
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Three-dimensional (3D) wind velocity measurements are of major importance for the characterization of atmospheric turbulence. This paper presents a detailed study of the measurement uncertainty of a three-beam wind-LiDAR designed for mounting on airborne platforms. Considering the geometrical constraints, the analysis provides quantitative estimates for the measurement uncertainty of all components of the 3D wind vector. As a result, we propose an optimized post-processing for error reduction.
Volker Wulfmeyer, Christoph Senff, Florian Späth, Andreas Behrendt, Diego Lange, Robert M. Banta, W. Alan Brewer, Andreas Wieser, and David D. Turner
Atmos. Meas. Tech., 17, 1175–1196, https://doi.org/10.5194/amt-17-1175-2024, https://doi.org/10.5194/amt-17-1175-2024, 2024
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A simultaneous deployment of Doppler, temperature, and water-vapor lidar systems is used to provide profiles of molecular destruction rates and turbulent kinetic energy (TKE) dissipation in the convective boundary layer (CBL). The results can be used for the parameterization of turbulent variables, TKE budget analyses, and the verification of weather forecast and climate models.
Daisuke Hotta, Katrin Lonitz, and Sean Healy
Atmos. Meas. Tech., 17, 1075–1089, https://doi.org/10.5194/amt-17-1075-2024, https://doi.org/10.5194/amt-17-1075-2024, 2024
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Global Navigation Satellite System (GNSS) polarimetric radio occultation (PRO) is a new type of GNSS observations that can detect heavy precipitation along the ray path between the emitter and receiver satellites. As a first step towards using these observations in numerical weather prediction (NWP), we developed a computer code that simulates GNSS-PRO observations from forecast fields produced by an NWP model. The quality of the developed simulator is evaluated with a number of case studies.
Mohamed Mossad, Irina Strelnikova, Robin Wing, and Gerd Baumgarten
Atmos. Meas. Tech., 17, 783–799, https://doi.org/10.5194/amt-17-783-2024, https://doi.org/10.5194/amt-17-783-2024, 2024
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This numerical study addresses observational gaps' impact on atmospheric gravity wave spectra. Three methods, fast Fourier transform (FFT), generalized Lomb–Scargle periodogram (GLS), and Haar structure function (HSF), were tested on synthetic data. HSF is best for spectra with negative slopes. GLS excels for flat and positive slopes and identifying dominant frequencies. Accurately estimating these aspects is crucial for understanding gravity wave dynamics and energy transfer in the atmosphere.
Kuo-Nung Wang, Chi O. Ao, Mary G. Morris, George A. Hajj, Marcin J. Kurowski, Francis J. Turk, and Angelyn W. Moore
Atmos. Meas. Tech., 17, 583–599, https://doi.org/10.5194/amt-17-583-2024, https://doi.org/10.5194/amt-17-583-2024, 2024
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In this article, we described a joint retrieval approach combining two techniques, RO and MWR, to obtain high vertical resolution and solve for temperature and moisture independently. The results show that the complicated structure in the lower troposphere can be better resolved with much smaller biases, and the RO+MWR combination is the most stable scenario in our sensitivity analysis. This approach is also applied to real data (COSMIC-2/Suomi-NPP) to show the promise of joint RO+MWR retrieval.
Filippo Emilio Scarsi, Alessandro Battaglia, Frederic Tridon, Paolo Martire, Ranvir Dhillon, and Anthony Illingworth
Atmos. Meas. Tech., 17, 499–514, https://doi.org/10.5194/amt-17-499-2024, https://doi.org/10.5194/amt-17-499-2024, 2024
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The WIVERN mission, one of the two candidates to be the ESA's Earth Explorer 11 mission, aims at providing measurements of horizontal winds in cloud and precipitation systems through a conically scanning W-band Doppler radar. This work discusses four methods that can be used to characterize and correct the Doppler velocity error induced by the antenna mispointing. The proposed methodologies can be extended to other Doppler concepts featuring conically scanning or slant viewing Doppler systems.
Luis Ackermann, Joshua Soderholm, Alain Protat, Rhys Whitley, Lisa Ye, and Nina Ridder
Atmos. Meas. Tech., 17, 407–422, https://doi.org/10.5194/amt-17-407-2024, https://doi.org/10.5194/amt-17-407-2024, 2024
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The paper addresses the crucial topic of hail damage quantification using radar observations. We propose a new radar-derived hail product that utilizes a large dataset of insurance hail damage claims and radar observations. A deep neural network was employed, trained with local meteorological variables and the radar observations, to better quantify hail damage. Key meteorological variables were identified to have the most predictive capability in this regard.
Christos Gatidis, Marc Schleiss, and Christine Unal
Atmos. Meas. Tech., 17, 235–245, https://doi.org/10.5194/amt-17-235-2024, https://doi.org/10.5194/amt-17-235-2024, 2024
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A common method to retrieve important information about the microphysical structure of rain (DSD retrievals) requires a constrained relationship between the drop size distribution parameters. The most widely accepted empirical relationship is between μ and Λ. The relationship shows variability across the different types of rainfall (convective or stratiform). The new proposed power-law model to represent the μ–Λ relation provides a better physical interpretation of the relationship coefficients.
Liqin Jin, Jakob Mann, Nikolas Angelou, and Mikael Sjöholm
Atmos. Meas. Tech., 16, 6007–6023, https://doi.org/10.5194/amt-16-6007-2023, https://doi.org/10.5194/amt-16-6007-2023, 2023
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By sampling the spectra from continuous-wave Doppler lidars very fast, the rain-induced Doppler signal can be suppressed and the bias in the wind velocity estimation can be reduced. The method normalizes 3 kHz spectra by their peak values before averaging them down to 50 Hz. Over 3 h, we observe a significant reduction in the bias of the lidar data relative to the reference sonic data when the largest lidar focus distance is used. The more it rains, the more the bias is reduced.
Florian Günzkofer, Gunter Stober, Dimitry Pokhotelov, Yasunobu Miyoshi, and Claudia Borries
Atmos. Meas. Tech., 16, 5897–5907, https://doi.org/10.5194/amt-16-5897-2023, https://doi.org/10.5194/amt-16-5897-2023, 2023
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Electric currents in the ionosphere can impact both satellite and ground-based infrastructure. These currents depend strongly on the collisions of ions and neutral particles. Measuring ion–neutral collisions is often only possible via certain assumptions. The direct measurement of ion–neutral collision frequencies is possible with multifrequency incoherent scatter radar measurements. This paper presents one analysis method of such measurements and discusses its advantages and disadvantages.
Cited articles
Alexander, M. J.: A simulated spectrum of convectively generated gravity
waves: Propagation from the tropopause to the mesopause and effects on the
middle atmosphere, J. Geophys. Res., 101, 1571–1588, https://doi.org/10.1029/95JD02046, 1996.
Ding, F., Yuan, H., Wan, W., Reid, I. M., and Woithe, J. M.: Occurrence
characteristics of medium-scale gravity waves observed in OH and OI
nightglow over Adelaide (34.5° S, 138.5° E), J. Geophys. Res. D Atmos., 109, 1–10,
https://doi.org/10.1029/2003JD004096, 2004.
Drob, D. P., Emmert, J. T., Crowley, G., Picone, J. M., Shepherd, G. G.,
Skinner, W., Hays, P., Niciejewski, R. J., Larsen, M., She, C.Y., Meriwether, J. W., Hernandez,
G., Jarvis, M. J., Sipler, D. P., Tepley, C. A., O'Brien, M. S., Bowman, J. R.,
Wu, Q., Murayama, Y., Kawamura, S., Reid, I. M., and Vincent, R. A.: An empirical
model of the Earth's horizontal wind fields: HWM07. J. Geophys. Res., 113, 12304, https://doi.org/10.1029/2008JA013668, 2008.
Ejiri, M. K., Shiokawa, K., Ogawa, T., Igarashi, K., Nakamura, T., and Tsuda,
T.: Statistical study of short-period gravity waves in OH and OI nightglow
images at two separated sites, J. Geophys. Res., 108, 4679, https://doi.org/10.1029/2002JD002795,
2003.
Fritts, D. C. and Alexander, M. J.: Gravity wave dynamics and effects in the
middle atmosphere, Rev. Geophys., 41, 1003, https://doi.org/10.1029/2001RG000106, 2003.
Holton, J. R. and Alexander, M. J.: Gravity waves in the mesosphere
generated by tropospheric convection, Tellus, Ser. B Chem. Phys. Meteorol., 51, 45–58,
https://doi.org/10.3402/tellusa.v51i1.12305, 1999.
Horinouchi, T., Pawson, S., Shibata, K., Langematz, U., Manzini, E.,
Giorgetta, M. A., Sassi, F., Wilson, R. J., Hamilton, K., de Grandpré, J., and Scaife, A. A.: Tropical
cumulus convection and upward-propagating waves in middle-atmospheric GCMs,
J. Atmos. Sci., 60, 2765–2782, https://doi.org/10.1175/1520-0469(2003)060<2765:TCCAUW>2.0.CO;2, 2003.
Kim, Y. H., Lee, C., Chung, J.-K., Kim, J.-H., and Chun, H.-Y.: Seasonal
variations of mesospheric gravity waves observed with an airglow all-sky
camera at Mt. Bohyun, Korea (36° N), J. Astron. Sp. Sci., 27, 181–188,
https://doi.org/10.5140/JASS.2010.27.3.181, 2010.
Lakshmi Narayanan, V. and Gurubaran, S.: Statistical characteristics of high
frequency gravity waves observed by OH airglow imaging from Tirunelveli
(8.7° N), J. Atmos. Solar-Terrestrial Phys., 92, 43–50, https://doi.org/10.1016/j.jastp.2012.09.002, 2013.
Li, Q., Xu, J., Yue, J., Yuan, W., and Liu, X.: Statistical characteristics
of gravity wave activities observed by an OH airglow imager at Xinglong, in
northern China, Ann. Geophys., 29, 1401–1410,
https://doi.org/10.5194/angeo-29-1401-2011, 2011.
Li, Z., Liu, A. Z., Lu, X., Swenson, G. R. and Franke, S. J.: Gravity wave
characteristics from OH airglow imager over Maui, J. Geophys. Res. Atmos.,
116, D22115,
https://doi.org/10.1029/2011JD015870, 2011.
Lighthill, J.: Waves in Fluids, Cambridge University Press, New York,
504 pp.,
1978.
Liu, A. Z. and Swenson, G. R.: A modeling study of O2 and OH airglow
perturbations induced by atmospheric gravity waves, J. Geophys. Res., 108, 4151, https://doi.org/10.1029/2002JD002474,
2003.
Marks, C. J. and Eckermann, S. D.: A three-dimensional nonhydrostatic ray-tracing
model for gravity waves: formulation and preliminary results for the middle
atmosphere, J. Atmos. Sci., 52, 1959–1984, 1995.
Matsuda, T. S., Nakamura, T., Ejiri, M. K., Tsutsumi, M., and Shiokawa, K.:
New statistical analysis of the horizontal phase velocity distribution of
gravity waves observed by airglow imaging, J. Geophys. Res. Atmos., 119, 9707–9718,
https://doi.org/10.1002/2014JD021543, 2014.
Medeiros, A. F., Taylor, M. J., Takahashi, H., Batista, P. P., and Gobbi, D.: An
investigation of gravity wave activity in the low-latitude upper mesosphere:
Propagation direction and wind filtering, J. Geophys. Res., 108, 4411, https://doi.org/10.1029/2002JD002593, 2003.
Medeiros, A. F., Takahashi, H., Buriti, R. A., Fechine, J., Wrasse, C. M.,
and Gobbi, D.: MLT gravity wave climatology in the South America equatorial
region observed by airglow imager, Ann. Geophys., 25, 399–406,
https://doi.org/10.5194/angeo-25-399-2007, 2007.
Mukherjee, G. K.: The signature of short-period gravity waves imaged in the
OI 557.7 nm and near infrared OH nightglow emissions over Panhala, J. Atmos. Solar-Terr. Phys., 65,
1329–1335, 2003.
Mukherjee, G. K., Pragati Sikha, R., Parihar, N., Ghodpage, R., and Patil,
P. T.: Studies of the wind filtering effect of gravity waves observed at
Allahabad (25.45° N, 81.85° E) in India, Earth Planets Space, 62, 309–318, 2010.
Nakamura, T., Higashikawa, A., and Tsuda, T.: Seasonal variation of gravity
waves observed with an OH CCD imager at Shigaraki (35° N, 136° E), Japan, Adv. Sp. Res., 24, 561–564,
https://doi.org/10.1016/S0273-1177(99)00201-X, 1999.
Nakamura, T., Aono, T., Tsuda, T., Admiranto, A. G., Achmad, E., and
Suranto, E.:
Mesospheric gravity waves over a tropical convective region observed by OH
airglow imaging in Indonesia, Geophys. Res. Lett., 30, 1882, https://doi.org/10.1029/2003GL017619,
2003.
Pandya, R. E. and Alexander, M. J.: Linear stratospheric gravity waves above
convective thermal forcing, J. Atmos. Sci., 56, 2434–2446,
https://doi.org/10.1175/1520-0469(1999)056<2434:LSGWAC>2.0.CO;2, 1999.
Parihar, N. and Taori, A.: An investigation of long-distance propagation of
gravity waves under CAWSES India Phase II Programme, Ann. Geophys., 33,
547–560, https://doi.org/10.5194/angeo-33-547-2015, 2015.
Paulino, I., Takahashi, H., Vadas, S. L., Wrasse, C. M., Sobral, J. H. A.,
Medeiros, A. F., Buriti, R. A., and Gobbi, D.: Forward ray-tracing for
medium-scale gravity waves observed during the COPEX campaign, J. Atmos. Solar-Terr. Phys., 90–91,
117–123, https://doi.org/10.1016/j.jastp.2012.08.006, 2012.
Pautet, P. D., Taylor, M. J., Liu, A. Z., and Swenson, G. R.: Climatology of
short-period gravity waves observed over northern Australia during the
Darwin Area Wave Experiment (DAWEX) and their dominant source regions, J. Geophys. Res.-Atmos.,
110, 1–13, https://doi.org/10.1029/2004JD004954, 2005.
Piani, C., Durran, D., Alexander, M. J., and Holton, J. R.: A numerical study
of three-dimensional gravity waves triggered by deep tropical convection and
their role in the dynamics of the QBO, J. Atmos. Sci., 57, 3689–3702,
https://doi.org/10.1175/1520-0469(2000)057<3689:ANSOTD>2.0.CO;2,
2000.
Picone, J. M., Hedin, A. E., Drob, D. P., and Aikin, A. C.: NRLMSISE-00 empirical
model of the atmosphere: statistical comparisons and scientific issues, J. Geophys. Res.,
107, 1468, https://doi.org/10.1029/2002JA009430, 2002.
Pragati, R. S., Parihar, N., Ghodpage, R., and Mukherjee, G. K.:
Characteristics of gravity waves in the upper mesospheric region observed by
OH airglow, Current Science 98, 392–397, 2010.
Pramitha, M., Venkat Ratnam, M., Taori, A., Krishna Murthy, B. V.,
Pallamraju, D., and Vijaya Bhaskar Rao, S.: Evidence for tropospheric wind
shear excitation of high-phase-speed gravity waves reaching the mesosphere
using the ray-tracing technique, Atmos. Chem. Phys., 15, 2709–2721,
https://doi.org/10.5194/acp-15-2709-2015, 2015.
Sivakandan, M., Taori, A., Sathishkumar, S., and Jayaraman, A.: Multi-instrument
investigation of a mesospheric gravity wave event absorbed into background,
J. Geophys. Res., 120, 3150–3159,, https://doi.org/10.1002/2014JA020896, 2015.
Smith, A. K.: Global Dynamics of the MLT, Surv. Geophys, 33, 1177–1230, https://doi.org/10.1007/s10712-012-9196-9, 2012.
Suzuki, S., Shiokawa, K., Hosokawa, K., Nakamura, K., and Hocking, W. K.:
Statistical characteristics of polar cap mesospheric gravity waves observed
by an all-sky airglow imager at Resolute Bay, Canada, J. Geophys. Res. Sp. Phys., 114, 1–8,
https://doi.org/10.1029/2008JA013652, 2009a.
Suzuki, S., Shiokawa, K., Liu, A. Z., Otsuka, Y., Ogawa, T., and Nakamura,
T.: Characteristics of equatorial gravity waves derived from mesospheric
airglow imaging observations, Ann. Geophys., 27, 1625–1629,
https://doi.org/10.5194/angeo-27-1625-2009, 2009b.
Taori, A., Raizada, S., Ratnam, M. V., Tepley, C. A., Nath, D., and
Jayaraman, A.: Role of Tropical Convective Cells in the Observed Middle
Atmospheric Gravity Wave Properties from Two Distant Low Latitude Stations,
Earth Sci. Res., 1, 87–97, https://doi.org/10.5539/esr.v1n1p87, 2012.
Taori, A., Jayaraman, A., and Kamalakar, V.: Imaging of
mesosphere-thermosphere airglow emissions over Gadanki (13.5° N,
79.2° E) – first results, J. Atmos. Solar-Terrestrial Phys., 93, 21–28,
https://doi.org/10.1016/j.jastp.2012.11.007, 2013.
Taylor, M. J. and Hapgood, M. A.: Identification of a thunderstorm as a
source of short period gravity waves in the upper atmospheric nightglow
emissions, Planet. Space Sci., 36, 975–985, https://doi.org/10.1016/0032-0633(88)90035-9, 1988.
Vadas, S. L. and Fritts, D. C.: Thermospheric responses to gravity waves:
influences of increasing viscosity and thermal diffusivity, J. Geophys. Res., 110, 15103,
https://doi.org/10.1029/2004JD005574, 2005.
Vadas, S. L. and Fritts, D. C.: Reconstruction of the gravity wave field from
convective plumes via ray tracing, Ann. Geophys., 27, 147–177, https://doi.org/10.5194/angeo-27-147-2009, 2009.
Vadas, S. L. and Liu, H.-L.: Generation of large-scale gravity waves and neutral
winds in the thermosphere from the dissipation of convectively generated
gravity waves, J. Geophys. Res., 114, A10310, https://doi.org/10.1029/2009JA014108, 2009.
Walterscheid, R. L., Hecht, J. H., Vincent, R. A., Reid, I. M., Woithe, J., and
Hickey, M. P.: Analysis and interpretation of airglow and radar observations
of quasi-monochromatic gravity waves in the upper mesosphere and lower
thermosphere over Adelaide, Australia (35° S, 138° E),
J. Atmos. Solar-Terrestrial Phys., 61, 461–478, https://doi.org/10.1016/S1364-6826(99)00002-4, 1999.
Wrasse, C. M., Nakamura, T., Takahashi, H., Medeiros, A. F., Taylor, M. J.,
Gobbi, D., Denardini, C. M., Fechine, J., Buriti, R. A., Salatun, A.,
Suratno, Achmad, E., and Admiranto, A. G.: Mesospheric gravity waves observed
near equatorial and low-middle latitude stations: wave characteristics and
reverse ray tracing results, Ann. Geophys., 24, 3229–3240,
https://doi.org/10.5194/angeo-24-3229-2006, 2006.
Short summary
The small-scale gravity waves are the least understood processes in the middle-atmospheric variability. Using airglow imaging, we provide new measurements of gravity wave propagation over equatorial latitudes in India. We find that propagation of waves is often in the opposite direction to the tropospheric convective regions. These waves are found to have horizontal wavelengths ranging from 12 to 42 km, with the phase velocities in the 20 to 90 km range.
The small-scale gravity waves are the least understood processes in the middle-atmospheric...
