Articles | Volume 11, issue 2
https://doi.org/10.5194/amt-11-763-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-11-763-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Feb 2018
Research article |
| 08 Feb 2018
| 08 Feb 2018
Sensitivity of airborne radio occultation to tropospheric properties over ocean and land
Department of Physical and Environmental Sciences, Texas A&M University – Corpus Christi, Corpus Christi, Texas, USA
Loknath Adhikari
Department of Physical and Environmental Sciences, Texas A&M University – Corpus Christi, Corpus Christi, Texas, USA
Jennifer S. Haase
Scripps Institution of Oceanography, University of California, San
Diego, California, USA
Brian Murphy
Department of Earth, Atmospheric, and Planetary Sciences, Purdue
University, West Lafayette, Indiana, USA
now at: Edison State Community College, Piqua, Ohio, USA
Kuo-Nung Wang
Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, California, USA
James L. Garrison
School of Aeronautics and Astronautics, Purdue University, West
Lafayette, Indiana, USA
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Atmospheric observations from GPS receiver satellites offer uniform spatial coverage over the Arctic. The GPS profiles sensing deep into the lowest 300 m of the atmosphere only reach 50–60 % in summer but over 70 % in other seasons. The profile uncertainty due to different data centers is within 0.07 % in refractivity, 0.72 K in temperature, and 0.05 g kg-1 in humidity below 10 km. A systematic negative bias of 1 % in refractivity below 2 km is only seen in the summer due to moisture impact.
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Global Positioning System (GPS) radio occultation (RO) signals can be inverted to provide profiles of temperature. Earlier inversion method that used geometric optics were observed to have large errors in the few kilometers of the atmosphere. Different theoretical methods were developed to address the deficiencies of the GO methods. In this study, we implement the full-spectrum inversion (FSI) method for inversion of GPSRO signal received by a receiver placed on an aircraft.
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Subject: Others (Wind, Precipitation, Temperature, etc.) | Technique: Remote Sensing | Topic: Validation and Intercomparisons
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Observations of vertical wind in regions with complex terrain are essential, but they are always sparse and have poor representation. Data verification and quality control are conducted on the wind profile radar and Aeolus wind products in this study, trying to compensate for the limitations of wind field observations. The results shed light on the comprehensive applications of multi-source wind profile data in complicated terrain regions with sparse ground-based wind observations.
Timothy J. Wagner, Thomas August, Tim Hultberg, and Ralph A. Petersen
Atmos. Meas. Tech., 17, 1–14, https://doi.org/10.5194/amt-17-1-2024, https://doi.org/10.5194/amt-17-1-2024, 2024
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Commercial passenger and freight aircraft need to know the temperature and pressure of the environments they fly through in order to safely operate. In this paper, we investigate how these observations can be used to evaluate and monitor the performance of satellite observations. Normally weather balloons are used for this, but in places like the United States there are many more airplane flights than weather balloon launches. This makes it much easier to compare them to satellites.
Maria Lívia L. M. Gava, Simone M. S. Costa, and Anthony C. S. Porfírio
Atmos. Meas. Tech., 16, 5429–5441, https://doi.org/10.5194/amt-16-5429-2023, https://doi.org/10.5194/amt-16-5429-2023, 2023
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This study assesses the effectiveness of two geostationary satellite-based sunshine duration datasets over Brazil. Statistical parameters were used to evaluate the performance of the products. The results showed generally good agreement between satellite and ground observations, with some regional discrepancies. Overall, both satellite products offer reliable data for various applications, which benefit from their high spatial resolution and low time latency.
Hubert Luce, Lakshmi Kantha, and Hiroyuki Hashiguchi
Atmos. Meas. Tech., 16, 5091–5101, https://doi.org/10.5194/amt-16-5091-2023, https://doi.org/10.5194/amt-16-5091-2023, 2023
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The potential ability of clear air radars to measure turbulence kinetic energy (TKE) dissipation rate ε in the atmosphere is a major asset of these instruments because of their continuous measurements. In the present work, we successfully tested the relevance of a model relating ε to the width of the Doppler spectrum peak and wind shear for shear-generated turbulence and we provide a physical interpretation of an empirical model in this context.
Sheila Kirkwood, Evgenia Belova, Peter Voelger, Sourav Chatterjee, and Karathazhiyath Satheesan
Atmos. Meas. Tech., 16, 4215–4227, https://doi.org/10.5194/amt-16-4215-2023, https://doi.org/10.5194/amt-16-4215-2023, 2023
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We compared 2 years of wind measurements by the Aeolus satellite with winds from two wind-profiler radars in Arctic Sweden and coastal Antarctica. Biases are similar in magnitude to results from other locations. They are smaller than in earlier studies due to more comparison points and improved criteria for data rejection. On the other hand, the standard deviation is somewhat higher because of degradation of the Aeolus lidar.
Haichen Zuo and Charlotte Bay Hasager
Atmos. Meas. Tech., 16, 3901–3913, https://doi.org/10.5194/amt-16-3901-2023, https://doi.org/10.5194/amt-16-3901-2023, 2023
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Aeolus is a satellite equipped with a Doppler wind lidar to detect global wind profiles. This study evaluates the impact of Aeolus winds on surface wind forecasts over tropical oceans and high-latitude regions based on the ECMWF observing system experiments. We find that Aeolus can slightly improve surface wind forecasts for the region > 60° N, especially from day 5 onwards. For other study regions, the impact of Aeolus is nearly neutral or limited, which requires further investigation.
Holger Baars, Joshua Walchester, Elizaveta Basharova, Henriette Gebauer, Martin Radenz, Johannes Bühl, Boris Barja, Ulla Wandinger, and Patric Seifert
Atmos. Meas. Tech., 16, 3809–3834, https://doi.org/10.5194/amt-16-3809-2023, https://doi.org/10.5194/amt-16-3809-2023, 2023
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In 2018, the Aeolus satellite of the European Space Agency (ESA) was launched to improve weather forecasts through global measurements of wind profiles. Given the novel lidar technique onboard, extensive validation efforts have been needed to verify the observations. For this reason, we performed long-term validation measurements in Germany and Chile. We found significant improvement in the data products due to a new algorithm version and can confirm the general validity of Aeolus observations.
Hubert Luce, Lakshmi Kantha, Hiroyuki Hashiguchi, Dale Lawrence, Abhiram Doddi, Tyler Mixa, and Masanori Yabuki
Atmos. Meas. Tech., 16, 3561–3580, https://doi.org/10.5194/amt-16-3561-2023, https://doi.org/10.5194/amt-16-3561-2023, 2023
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Doppler radars can be used to estimate turbulence kinetic energy dissipation rates in the atmosphere. The performance of various models is evaluated from comparisons between UHF wind profiler and in situ measurements with UAVs. For the first time, we assess a model supposed to be valid for weak stratification or strong shear conditions. This model provides better agreements with in situ measurements than the classical model based on the hypothesis of a stable stratification.
Chengfeng Feng and Zhaoxia Pu
Atmos. Meas. Tech., 16, 2691–2708, https://doi.org/10.5194/amt-16-2691-2023, https://doi.org/10.5194/amt-16-2691-2023, 2023
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This study demonstrates the positive impacts of assimilating Aeolus Mie-cloudy and Rayleigh-clear near-real-time horizontal line-of-sight winds on the analysis and forecasts of Hurricane Ida (2021) and a mesoscale convective system associated with an African easterly wave using the mesoscale community Weather Research and Forecasting model and the NCEP Gridpoint Statistical Interpolation-based three-dimensional ensemble-variational hybrid data assimilation system.
Tim Trent, Richard Siddans, Brian Kerridge, Marc Schröder, Noëlle A. Scott, and John Remedios
Atmos. Meas. Tech., 16, 1503–1526, https://doi.org/10.5194/amt-16-1503-2023, https://doi.org/10.5194/amt-16-1503-2023, 2023
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Modern weather satellites provide essential information on our lower atmosphere's moisture content and temperature structure. This measurement record will span over 40 years, making it a valuable resource for climate studies. This study characterizes atmospheric temperature and humidity profiles from a European Space Agency climate project. Using weather balloon measurements, we demonstrated the performance of this dataset was within the tolerances required for future climate studies.
Benjamin Witschas, Christian Lemmerz, Alexander Geiß, Oliver Lux, Uwe Marksteiner, Stephan Rahm, Oliver Reitebuch, Andreas Schäfler, and Fabian Weiler
Atmos. Meas. Tech., 15, 7049–7070, https://doi.org/10.5194/amt-15-7049-2022, https://doi.org/10.5194/amt-15-7049-2022, 2022
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In August 2018, the first wind lidar Aeolus was launched into space and has since then been providing data of the global wind field. The primary goal of Aeolus was the improvement of numerical weather prediction. To verify the quality of Aeolus wind data, DLR performed four airborne validation campaigns with two wind lidar systems. In this paper, we report on results from the two later campaigns, performed in Iceland and the tropics.
Olivier Bock, Pierre Bosser, and Carl Mears
Atmos. Meas. Tech., 15, 5643–5665, https://doi.org/10.5194/amt-15-5643-2022, https://doi.org/10.5194/amt-15-5643-2022, 2022
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Integrated water vapour measurements are often compared for the calibration and validation of instruments or techniques. Measurements made at different altitudes must be corrected to account for the vertical variation of water vapour. This paper shows that the widely used empirical correction model has severe limitations that are overcome using the proposed model. The method is applied to the inter-comparison of GPS and satellite microwave radiometer data in a tropical mountainous area.
Anthony J. Mannucci, Chi O. Ao, Byron A. Iijima, Thomas K. Meehan, Panagiotis Vergados, E. Robert Kursinski, and William S. Schreiner
Atmos. Meas. Tech., 15, 4971–4987, https://doi.org/10.5194/amt-15-4971-2022, https://doi.org/10.5194/amt-15-4971-2022, 2022
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The Global Positioning System (GPS) radio occultation (RO) technique is a satellite-based method for producing highly accurate vertical profiles of atmospheric temperature and pressure. RO profiles are used to monitor global climate trends, particularly in that region of the atmosphere that includes the lower stratosphere. Two data sets spanning 1995–1997 that were produced from the first RO satellite are highly accurate and can be used to assess global atmospheric models.
Ze Chen, Yufang Tian, Yinan Wang, Yongheng Bi, Xue Wu, Juan Huo, Linjun Pan, Yong Wang, and Daren Lü
Atmos. Meas. Tech., 15, 4785–4800, https://doi.org/10.5194/amt-15-4785-2022, https://doi.org/10.5194/amt-15-4785-2022, 2022
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Small-scale turbulence plays a vital role in the vertical exchange of heat, momentum and mass in the atmosphere. There are currently three models that can use spectrum width data of MST radar to calculate turbulence parameters. However, few studies have explored the applicability of the three calculation models. We compared and analysed the turbulence parameters calculated by three models. These results can provide a reference for the selection of models for calculating turbulence parameters.
Damao Zhang, Jennifer Comstock, and Victor Morris
Atmos. Meas. Tech., 15, 4735–4749, https://doi.org/10.5194/amt-15-4735-2022, https://doi.org/10.5194/amt-15-4735-2022, 2022
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The planetary boundary layer is the lowest part of the atmosphere. Its structure and depth (PBLHT) significantly impact air quality, global climate, land–atmosphere interactions, and a wide range of atmospheric processes. To test the robustness of the ceilometer-estimated PBLHT under different atmospheric conditions, we compared ceilometer- and radiosonde-estimated PBLHTs using multiple years of U.S. DOE ARM measurements at various ARM observatories located around the world.
Rachel Robey and Julie K. Lundquist
Atmos. Meas. Tech., 15, 4585–4622, https://doi.org/10.5194/amt-15-4585-2022, https://doi.org/10.5194/amt-15-4585-2022, 2022
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Our work investigates the behavior of errors in remote-sensing wind lidar measurements due to turbulence. Using a virtual instrument, we measured winds in simulated atmospheric flows and decomposed the resulting error. Dominant error mechanisms, particularly vertical velocity variations and interactions with shear, were identified in ensemble data over three test cases. By analyzing the underlying mechanisms, the response of the error behavior to further varying flow conditions may be projected.
Donato Summa, Fabio Madonna, Noemi Franco, Benedetto De Rosa, and Paolo Di Girolamo
Atmos. Meas. Tech., 15, 4153–4170, https://doi.org/10.5194/amt-15-4153-2022, https://doi.org/10.5194/amt-15-4153-2022, 2022
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The evolution of the atmospheric boundary layer height (ABLH) has an important impact on meteorology. However, the complexity of the phenomena occurring within the ABL and the influence of advection and local accumulation processes often prevent an unambiguous determination of the ABLH. The paper reports results from an inter-comparison effort involving different sensors and techniques to measure the ABLH. Correlations between the ABLH and other atmospheric variables are also assessed.
Haichen Zuo, Charlotte Bay Hasager, Ioanna Karagali, Ad Stoffelen, Gert-Jan Marseille, and Jos de Kloe
Atmos. Meas. Tech., 15, 4107–4124, https://doi.org/10.5194/amt-15-4107-2022, https://doi.org/10.5194/amt-15-4107-2022, 2022
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The Aeolus satellite was launched in 2018 for global wind profile measurement. After successful operation, the error characteristics of Aeolus wind products have not yet been studied over Australia. To complement earlier validation studies, we evaluated the Aeolus Level-2B11 wind product over Australia with ground-based wind profiling radar measurements and numerical weather prediction model equivalents. The results show that the Aeolus can detect winds with sufficient accuracy over Australia.
Carmen González, José M. Vilaplana, José A. Bogeat, and Antonio Serrano
Atmos. Meas. Tech., 15, 4125–4133, https://doi.org/10.5194/amt-15-4125-2022, https://doi.org/10.5194/amt-15-4125-2022, 2022
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Monitoring ultraviolet (UV) radiation is important since it can have harmful effects on the biosphere. Array spectroradiometers are increasingly used to measure UV as they are more versatile than scanning spectroradiometers. In this study, the long-term performance of the BTS-2048-UV-S-WP array spectroradiometer was assessed. The results show that the BTS can reliably measure both the UV index and UV radiation in the 300–360 nm range. Moreover, the BTS was stable and showed no seasonal behavior.
Charlotte Rahlves, Frank Beyrich, and Siegfried Raasch
Atmos. Meas. Tech., 15, 2839–2856, https://doi.org/10.5194/amt-15-2839-2022, https://doi.org/10.5194/amt-15-2839-2022, 2022
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Lidars can measure the wind profile in the lower part of the atmosphere, provided that the wind field is horizontally uniform and does not change during the time of the measurement. These requirements are mostly not fulfilled in reality, and the lidar wind measurement will thus hold a certain error. We investigate different strategies for lidar wind profiling using a lidar simulator implemented in a numerical simulation of the wind field. Our findings can help to improve wind measurements.
Katherine E. Lukens, Kayo Ide, Kevin Garrett, Hui Liu, David Santek, Brett Hoover, and Ross N. Hoffman
Atmos. Meas. Tech., 15, 2719–2743, https://doi.org/10.5194/amt-15-2719-2022, https://doi.org/10.5194/amt-15-2719-2022, 2022
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Winds that are crucial to weather forecasting derived from two different techniques – tracking satellite images (AMVs) and direct measurement of molecular and aerosol motions by Doppler lidar (Aeolus satellite winds) – are compared. We find that AMVs and Aeolus winds are highly correlated. Aeolus Mie-cloudy winds have great potential value as a comparison standard for AMVs. Larger differences are found in the Southern Hemisphere related to higher wind speed and higher vertical variation in wind.
Marijn Floris van Dooren, Anantha Padmanabhan Kidambi Sekar, Lars Neuhaus, Torben Mikkelsen, Michael Hölling, and Martin Kühn
Atmos. Meas. Tech., 15, 1355–1372, https://doi.org/10.5194/amt-15-1355-2022, https://doi.org/10.5194/amt-15-1355-2022, 2022
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The remote sensing technique lidar is widely used for wind speed measurements for both industrial and academic applications. Lidars can measure wind statistics accurately but cannot fully capture turbulent fluctuations in the high-frequency range, since they are partly filtered out. This paper therefore investigates the turbulence spectrum measured by a continuous-wave lidar and analytically models the lidar's measured spectrum with a Lorentzian filter function and a white noise term.
Alain Protat, Valentin Louf, Joshua Soderholm, Jordan Brook, and William Ponsonby
Atmos. Meas. Tech., 15, 915–926, https://doi.org/10.5194/amt-15-915-2022, https://doi.org/10.5194/amt-15-915-2022, 2022
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This study uses collocated ship-based, ground-based, and spaceborne radar observations to validate the concept of using the GPM spaceborne radar observations to calibrate national weather radar networks to the accuracy required for operational severe weather applications such as rainfall and hail nowcasting.
Wagner Wolff, Aart Overeem, Hidde Leijnse, and Remko Uijlenhoet
Atmos. Meas. Tech., 15, 485–502, https://doi.org/10.5194/amt-15-485-2022, https://doi.org/10.5194/amt-15-485-2022, 2022
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The existing infrastructure for cellular communication is promising for ground-based rainfall remote sensing. Rain-induced signal attenuation is used in dedicated algorithms for retrieving rainfall depth along commercial microwave links (CMLs) between cell phone towers. This processing is a source of many uncertainties about input data, algorithm structures, parameters, CML network, and local climate. Application of a stochastic optimization method leads to improved CML rainfall estimates.
Songhua Wu, Kangwen Sun, Guangyao Dai, Xiaoye Wang, Xiaoying Liu, Bingyi Liu, Xiaoquan Song, Oliver Reitebuch, Rongzhong Li, Jiaping Yin, and Xitao Wang
Atmos. Meas. Tech., 15, 131–148, https://doi.org/10.5194/amt-15-131-2022, https://doi.org/10.5194/amt-15-131-2022, 2022
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During the VAL-OUC campaign, we established a coherent Doppler lidar (CDL) network over China to verify the Level 2B (L2B) products from Aeolus. By the simultaneous wind measurements with CDLs at 17 stations, the L2B products from Aeolus are compared with those from CDLs. To our knowledge, the VAL-OUC campaign is the most extensive so far between CDLs and Aeolus in the lower troposphere for different atmospheric scenes. The vertical velocity impact on the HLOS retrieval from Aeolus is evaluated.
Karina Wilgan, Galina Dick, Florian Zus, and Jens Wickert
Atmos. Meas. Tech., 15, 21–39, https://doi.org/10.5194/amt-15-21-2022, https://doi.org/10.5194/amt-15-21-2022, 2022
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The assimilation of GNSS data in weather models has a positive impact on the forecasts. The impact is still limited due to using only the GPS zenith direction parameters. We calculate and validate more advanced tropospheric products from three satellite systems: the US American GPS, Russian GLONASS and European Galileo. The quality of all the solutions is comparable; however, combining more GNSS systems enhances the observations' geometry and improves the quality of the weather forecasts.
Hironori Iwai, Makoto Aoki, Mitsuru Oshiro, and Shoken Ishii
Atmos. Meas. Tech., 14, 7255–7275, https://doi.org/10.5194/amt-14-7255-2021, https://doi.org/10.5194/amt-14-7255-2021, 2021
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The first space-based Doppler wind lidar on board the Aeolus satellite was launched on 22 August 2018 to obtain global horizontal wind profiles. In this study, wind profilers, ground-based coherent Doppler wind lidars, and GPS radiosondes were used to validate the quality of Aeolus Level 2B wind products over Japan during three different periods. The results show that Aeolus can measure the horizontal winds over Japan accurately.
Tim A. van Kempen, Filippo Oggionni, and Richard M. van Hees
Atmos. Meas. Tech., 14, 6711–6722, https://doi.org/10.5194/amt-14-6711-2021, https://doi.org/10.5194/amt-14-6711-2021, 2021
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Validation of the instrument stability of the TROPOMI-SWIR module is done by monitoring a group of very stable and remote locations in the Saharan and Arabian deserts. These results confirm the excellent stability and lack of degradation of the TROPOMI-SWIR module derived from the internal calibration sources. The method was done for the first time on a spectrometer in the short-wave infrared and ensures TROPOMI-SWIR can be used for atmospheric research for years to come.
Susanna Hagelin, Roohollah Azad, Magnus Lindskog, Harald Schyberg, and Heiner Körnich
Atmos. Meas. Tech., 14, 5925–5938, https://doi.org/10.5194/amt-14-5925-2021, https://doi.org/10.5194/amt-14-5925-2021, 2021
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In this paper we study the impact of using wind observations from the Aeolus satellite, which provides wind speed profiles globally, in our numerical weather prediction system using a regional model covering the Nordic countries. The wind speed profiles from Aeolus are assimilated by the model, and we see that they have an impact on both the model analysis and forecast, though given the relatively few observations available the impact is often small.
Yuefei Zeng, Tijana Janjic, Yuxuan Feng, Ulrich Blahak, Alberto de Lozar, Elisabeth Bauernschubert, Klaus Stephan, and Jinzhong Min
Atmos. Meas. Tech., 14, 5735–5756, https://doi.org/10.5194/amt-14-5735-2021, https://doi.org/10.5194/amt-14-5735-2021, 2021
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Observation errors (OEs) of radar measurements are correlated. The Desroziers method has been often used to estimate statistics of OE in data assimilation. However, the resulting statistics consist of contributions from different sources and are difficult to interpret. Here, we use an approach based on samples for truncation error to approximate the representation error due to unresolved scales and processes (RE) and compare its statistics with OE statistics estimated by the Desroziers method.
Evgenia Belova, Sheila Kirkwood, Peter Voelger, Sourav Chatterjee, Karathazhiyath Satheesan, Susanna Hagelin, Magnus Lindskog, and Heiner Körnich
Atmos. Meas. Tech., 14, 5415–5428, https://doi.org/10.5194/amt-14-5415-2021, https://doi.org/10.5194/amt-14-5415-2021, 2021
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Wind measurements from two radars (ESRAD in Arctic Sweden and MARA at the Indian Antarctic station Maitri) are compared with lidar winds from the ESA satellite Aeolus, for July–December 2019. The aim is to check if Aeolus data processing is adequate for the sunlit conditions of polar summer. Agreement is generally good with bias in Aeolus winds < 1 m/s in most circumstances. The exception is a large bias (7 m/s) when the satellite has crossed a sunlit Antarctic ice cap before passing MARA.
Ramashray Yadav, Ram Kumar Giri, and Virendra Singh
Atmos. Meas. Tech., 14, 4857–4877, https://doi.org/10.5194/amt-14-4857-2021, https://doi.org/10.5194/amt-14-4857-2021, 2021
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We performed an intercomparison of seasonal and annual studies of retrievals of integrated precipitable water vapor (IPWV) carried out by INSAT-3DR satellite-borne infrared radiometer sounding and CAMS reanalysis data with ground-based Indian GNSS data. The magnitude and sign of the bias of INSAT-3DR and CAMS with respect to GNSS IPWV differs from station to station and season to season. A statistical evaluation of the collocated data sets was done to improve day-to-day weather forecasting.
Matic Šavli, Vivien Pourret, Christophe Payan, and Jean-François Mahfouf
Atmos. Meas. Tech., 14, 4721–4736, https://doi.org/10.5194/amt-14-4721-2021, https://doi.org/10.5194/amt-14-4721-2021, 2021
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The ESA's Aeolus satellite wind retrieval is provided through a series of processors. It depends on the temperature and pressure specification, which, however, are not measured by the satellite. The numerical weather predicted values are used instead, but these are erroneous. This article studies the sensitivity of the wind retrieval by introducing errors in temperature and pressure. This has been found to be small for Aeolus but is expected to be more crucial for future missions.
Kristopher M. Bedka, Amin R. Nehrir, Michael Kavaya, Rory Barton-Grimley, Mark Beaubien, Brian Carroll, James Collins, John Cooney, G. David Emmitt, Steven Greco, Susan Kooi, Tsengdar Lee, Zhaoyan Liu, Sharon Rodier, and Gail Skofronick-Jackson
Atmos. Meas. Tech., 14, 4305–4334, https://doi.org/10.5194/amt-14-4305-2021, https://doi.org/10.5194/amt-14-4305-2021, 2021
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This paper demonstrates the Doppler Aerosol WiNd (DAWN) lidar and High Altitude Lidar Observatory (HALO) measurement capabilities across a range of atmospheric conditions, compares DAWN and HALO measurements with Aeolus satellite Doppler wind lidar to gain an initial perspective of Aeolus performance, and discusses how atmospheric dynamic processes can be resolved and better understood through simultaneous observations of wind, water vapour, and aerosol profile observations.
Cited articles
Adhikari, L., Xie, F., and Haase, J. S.: Application of the full spectrum
inversion algorithm to simulated airborne GPS radio occultation signals,
Atmos. Meas. Tech., 9, 5077–5087, https://doi.org/10.5194/amt-9-5077-2016,
2016.
Anthes, R. A.: Exploring Earth's atmosphere with radio occultation:
contributions to weather, climate and space weather, Atmos. Meas. Tech., 4,
1077–1103, https://doi.org/10.5194/amt-4-1077-2011, 2011.
Anthes, R. A., Bernhardt, P. A., Chen, Y., Cucurull, L., Dymond, K. F.,
Ector, D., Healy, S. B., Ho, S. P., Hunt, D. C., Kuo, Y.-H., Liu, H.,
Manning, K., McCormick, C., Meehan, T. K., Randel, W. J., Rocken, C.,
Schreiner,W. S., Sokolovskiy, S. V., Syndergaard, S., Thompson, D. C.,
Trenberth, K. E., Wee, T. K., Yen, N. L., and Zeng, Z.: The COSMIC/FORMOSAT-3
Mission-Early results, B. Am. Meteorol. Soc., 89, 313–333,
https://doi.org/10.1175/BAMS-89-3-313, 2008.
Ao, C. O.: Effect of ducting on radio occultation measurements: An
assessment based on high-resolution radiosonde soundings, Radio Sci., 42,
RS2008, https://doi.org/10.1029/2006RS003485, 2007.
Ao, C. O., Meehan, T. K., Hajj, G. A., Mannucci, A. J., and Beyerle, G.:
Lower troposphere refractivity bias in GPS occultation retrievals, J.
Geophys. Res., 108, 4577, https://doi.org/10.1029/2002JD003216, 2003.
Ao, C. O., Hajj, G. A., Meehan, T. K., Dong, D., Iijima, B. A., Mannucci, A.
J., and Kursinski, E. R.: Rising and setting GPS occultations by use of
open-loop tracking, J. Geophys. Res., 114, D04101, https://doi.org/10.1029/2008JD010483,
2009.
Beyerle, G., Schmidt, T., Wickert, J., Heise, S., Rotacher, M.,
König-Langlo, G., and Lauritsen, K. B.: Observations and simulations of
receiver-induced refractivity biases in GPS radio occultation, J. Geophys.
Res., 111, D12101, https://doi.org/10.1029/2005JD006673, 2006.
Cucurull, L. and Derber, J. C.: Operational implementation of COSMIC
observations into NCEP's Global Data Assimilation System, Weather Forecast.,
23, 702–711, https://doi.org/10.1175/2008WAF2007070.1, 2008.
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P.,
Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P.,
Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N.,
Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S.
B., Hersbach, H., Hólm, E. V., Isaksen, L., Kållberg, P., Köhler, M.,
Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park,
B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart,
F.:
The ERA-Interim reanalysis: Configuration and performance
of the data assimilation system, Q. J. Roy. Meteor. Soc., 137, 553–597,
https://doi.org/10.1002/qj.828, 2011.
Garrison, J. L., Walker, M., Haase, J., Lulich, T., Xie, F., Ventre, B. D.,
Boehme, M. H., Wilmhoff, B., and Katzberg S. J.: Development and testing of
the GISMOS instrument, Geoscience and Remote Sensing Symposium, IGARSS 2007,
IEEE International, 5105–5108, 23–28 July 2007,
https://doi.org/10.1109/IGARSS.2007.4424010, 2007.
Haase, J. S., Murphy, B. J., Muradyan, P., Nievinski, F. G., Larson, K. M.,
Garrison, J. L., and Wang, K.-N.: First results from an airborne GPS radio
occultation system for atmospheric profiling, Geophys. Res. Lett., 40,
1759–1765, https://doi.org/10.1002/2013GL058681, 2014.
Healy, S. B., Haase, J., and Lesne, O.: Letter to the Editor Abel
transform inversion of radio occultation measurements made with a receiver
inside the Earth's atmosphere, Ann. Geophys., 20, 1253–1256,
https://doi.org/10.5194/angeo-20-1253-2002, 2002.
Healy, S. and Thépaut, J. N.: Assimilation experiments with CHAMP GPS
radio occultation measurements, Q. J. Roy. Meteorol. Soc., 132, 605–623,
https://doi.org/10.1256/qj.04.182, 2006.
Healy, S. B.: Refractivity coefficients used in the assimilation of GPS
radio occultation measurements, J. Geophys. Res., 116, D01106,
https://doi.org/10.1029/2010JD014013, 2011.
Jensen, A. S., Lohmann, M. S., Benzon, H.-H., and Nielsen, A. S.: Full
Spectrum Inversion of radio occultation signals, Radio Sci., 38, 1040,
https://doi.org/10.1029/2002RS002763, 2003.
Jensen, A. S., Lohmann, M. S., Nielsen, A. S., and Benzon, H.-H.:
Geometrical optics phase matching of radio occultation signals, Radio Sci.,
39, RS3009, https://doi.org/10.1029/2003RS002899, 2004.
Kirchengast, G., Hafner, J., and Poetzi, W.: The CIRA86aQ_UoG
model: An extension of the CIRA-86 monthly tables including humidity tables
and a Fortran95 global moist air climatology model, IMG/UoG Techn. Rep. for
ESA/ESTEC, 8, Eur. Space Agency, Paris, France, 1999.
Kursinski, E. R., Hajj, G. A., Hardy, K. R., Schofield, J. T., and Linfield,
R.: Observing Earth's atmosphere with radio occultation measurements, J.
Geophys. Res., 102, 23429–23465, 1997.
Lesne, O., Haase, J., Kirchengast, G., Ramsauer, J., and Poetzi, W.:
Sensitivity Analysis of GNSS radio occultation for airborne sounding of the
troposphere, Phys. Chem. Earth, 27, 291–299, 2002.
Lulich, T. D., Garrison, J. L., Haase, J. S., Yang, Y. M., Voo, J., Xie,
F., and Muradyan, P.: Open loop tracking of radio occultation signals from an
airborne platform, Proceedings of the 23rd International Technical Meeting of
the Satellite Division of the Institute of Navigation, ION GNSS 2010,
21–24 September, Portland, OR, 2010.
Luntama, J.-P., Kirchengast, G., Borsche, M., Foelsche, U., Steiner, A.,
Healy, S., von Engeln, A., O'Clerigh, E., and Marquardt, C.: Prospects of the
EPS GRAS mission for operational atmospheric applications, B. Am. Meteorol.
Soc., 89, 1863–1875, https://doi.org/10.1175/2008BAMS2399.1, 2008.
Montgomery, M. T., Davis, C., Dunkerton, T., Wang, Z., Valden, C., Torn, R.,
Majumdar, S. J., Zhang, F., Smith, R. K., Bosart, L., Bell, M. M., Haase, J.
S., Heymsfield, A., Jensen, J., Campos, T., and Boothe, M. A.: The
Pre-Depression Investigation of Cloud systems in the Tropics (PREDICT)
experiment: Scientific basis, new analysis tools, and some first results, B.
Am. Meteorol. Soc., 92, 153–172, https://doi.org/10.1175/BAMS-D-11-00046.1, 2012.
Muradyan, P.: GPS/INS navigation precision and its effect on airborne radio
occultation, MS thesis, Purdue University, West Lafayette, Indiana, USA, 93
pp., 2009.
Muradyan, P.: Profiling the atmosphere with the airborne GPS radio
occultation technique using open-loop tracking, PhD thesis, Purdue
University, West Lafayette, Indiana, 196 pp., 2012.
Muradyan, P., Haase, J. S., Xie, F., Garrison, J. L., Lulich, T., and Voo,
J.: GPS/INS navigation precision and its effect on airborne radio occultation
retrieval accuracy, GPS Solutions, 15, 207–218,
https://doi.org/10.1007/s10291-010-0183-7, 2010.
Murphy, B., Haase, J. S., Muradyan, P., Garrison, J. L., and Wang, K.-N.:
Airborne GPS radio occultation refractivity profiles observed in tropical
storm environments, J. Geophys. Res., 120, 1690–1709,
https://doi.org/10.1002/2014JD022931, 2015.
Rocken, C., Anthes, R., Exner, M., Hunt, D., Sokolovskiy, S., Ware, R.,
Gorbunov, M., Schreiner, W., Feng, D., Herman, B., Kuo, Y.-H., and Zou, X.:
Analysis and validation of GPS/MET data in the neutral atmosphere, J.
Geophys. Res., 102, 29849–29866, https://doi.org/10.1029/97JD02400, 1997.
Smith, E. K. and Weintraub, S.: The constants in the equation for
atmospheric refractive index at radio frequencies, Proc. Inst. Radio Eng.,
41, 1035–1037, 1953.
Sokolovskiy, S., Rocken, C., Schreiner, W., and Hunt, D.: On the uncertainty
of radio occultation inversions in the lower troposphere, J. Geophys. Res.,
115, D22111, https://doi.org/10.1029/2010JD014058, 2010.
Sokolovskiy, S. V.: Effect of superrefraction on inversions of radio
occultation signals in the lower troposphere, Radio Sci., 38, 1058,
https://doi.org/10.1029/2002RS002728, 2003.
Voo, J. K., Garrison, J. L., Haase, J. S., and Lulich, T. D.: Recent
experiments in ocean remote sensing with bistatic radar using global
navigation satellite signals, in 2009 IEEE Radar Conference, Pasadena,
Calif., IEEE, New York, p. 5, https://doi.org/10.1109/RADAR.2009.4977115, 2009.
Wang, K.-N., Garrison, J. L., Acikoz, U., Haase, J. S., Murphy, B. J.,
Muradyan, P., and Lulich, T.: Open-loop tracking of rising and setting GPS
radio-occultation signals from an airborne platform: Signal model and error
analysis, IEEE T. Geosci. Remote, 54, 3967–3984,
https://doi.org/10.1109/TGRS.2016.2532346, 2016.
Wang, K.-N., Garrison, J. L., Haase, J. S., and Murphy, B. J.: Improvements to
the GPS airborne radio occultation in the lower troposphere through
implementation of the phase matching method, J. Geophys. Res., 122,
10266–10281, https://doi.org/10.1002/2017JD026568, 2017.
Ware, R., Rocken, C., Solheim, F., Exner, M., Schreiner, W., Anthes, R.,
Feng, D., Herman, B., Gorbunov, M., Sokolovskiy, S., Hardy, K., Kuo, Y., Zou,
X., Trenberth, K., Meehan, T., Melbourne, W., and Businger, S.: GPS sounding
of the Atmosphere from Low Earth Orbit, Preliminary Results, B. Am. Meteorol.
Soc., 77, 19–40, https://doi.org/10.1175/1520-0477(1996)077<0019:GSOTAF>2.0.CO;2,
1996.
Xie, F., Syndergaard, S., Kursinski, E. R., and Herman, B. M.: An Approach
for Retrieving Marine Boundary Layer Refractivity from GPS Occultation Data
in the Presence of Super-refraction, J. Atmos. Ocean. Tech., 23, 1629–1644,
2006.
Xie, F., Haase, J. S., and Syndergaard, S.: Profiling the Atmosphere using the
Airborne GPS Radio Occultation Technique: A Sensitivity Study, IEEE T.
Geosci. Remote, 46, 3424–3435, https://doi.org/10.1109/TGRS.2008.2004713, 2008.
Xie, F., Wu, D. L., Ao, C. O., Kursinski, E. R., Mannucci, A., and
Syndergaard, S.: Super-refraction effects on GPS radio occultation
refractivity in marine boundary layers, Geophys. Res. Lett., 37, L11805,
https://doi.org/10.1029/2010GL043299, 2010.
Yoshihara, T., Fujii, N., Saitoh, S., Sakai, T., Matsunaga, K., Hoshinoo,
K., Tsuda, T., Aoyama, Y., and Danno, S.: Airborne-based downwardlooking GPS
occultation experiments, IEICE Trans. Commun. JPN Eddition, J89-B(7),
1233–1241, 2006 (in Japanese).
Zuffada, C., Hajj, G. A., and Kursinski, E. R.: A novel approach to atmospheric
profiling with a mountain-based or airborne receiver, J. Geophys. Res., 104,
24435–24447, https://doi.org/10.1029/1999JD900766, 1999.
Short summary
The GPS signal going through the atmosphere will experience refraction or bending, which can be precisely measured and used to infer the atmospheric properties. This paper demonstrates that high-quality atmospheric measurement with less than ~ 0.4 K is achievable from a GPS recording system with a simple antenna mounted on top of an aircraft cruising at ~ 13 km. Such a simple airborne GPS system can be implemented on commercial aircraft to provide valuable data for weather models in the future.
The GPS signal going through the atmosphere will experience refraction or bending, which can be...
