Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Preprints
https://doi.org/10.5194/amt-2020-58
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-58
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Apr 2020

09 Apr 2020

Review status
A revised version of this preprint is currently under review for the journal AMT.

On the retrieval of snow grain morphology, the accuracy of simulated reflectance over snow using airborne measurements in the Arctic

Soheila Jafariserajehlou1, Vladimir V. Rozanov1, Marco Vountas1, Charles K. Gatebe2,3, and John P. Burrows1 Soheila Jafariserajehlou et al.
  • 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 2Universities Space Research Association (USRA), Columbia, MD, USA
  • 3NASA Goddard Space Flight Center, Greenbelt, MD, USA

Abstract. Accurate knowledge of the reflectance from snow/ice covered surface is of fundamental importance for the investigation and retrieval of snow parameters and atmospheric constituents. This is a prerequisite for identifying and quantifying changes in the environment and climate in Polar Regions. However, the current differences between simulated and measured reflectance in a coupled snow-atmosphere system, leads to systematic errors in the determination of the amount of trace gases, aerosol and cloud parameters from space based and airborne passive remote sensing observations.

In this paper, we describe studies of the retrieval of snow grain morphologies, also called habits, and their use to determine reflectance and test the accuracy of our radiative transfer model simulations of reflectance by comparison with measurements. Firstly we report on a sensitivity study. This addresses the requirement for adequate a priori knowledge about snow models and ancillary information about the atmosphere; the objective being to minimize differences between measurements and simulation. For this aim we use the well-validated phenomenological radiative transfer model SCIATRAN. Secondly and more importantly, we present a novel two-stage snow grain morphology (i.e. size and shape of ice crystals in the snow) retrieval algorithm. We then describe the use of this new retrieval to estimate the most representative snow model, using different types of snow morphologies, for the airborne observation conditions, performed by NASA's Cloud Absorption Radiometer (CAR). The results show that the retrieved ice crystal shapes are consistent with the expected snow morphology (estimated from temperature information) in the measurement area over Barrow/Utqiaġvik, Alaska in 2008.

Thirdly, we present a comprehensive comparison of the simulated reflectance (using retrieved snow grain size and shape as well as independent atmospheric data) with that from airborne CAR measurements in the visible and NIR wavelength range. The results of this comparison are used to assess the quality and accuracy of the radiative transfer model in the simulation of the reflectance in a coupled snow-atmosphere system.

Assuming that that snow layer consists of ice crystals with aggregates of 8 column ice habit having an effective radius ~ 98.83 μm, we find that for a surface covered by old snow, the Pearson correlation coefficient, R, between measurements and simulations to be 0.98 (R2 ~ 0.96). For freshly fallen snow on areas having surface inhomogenity, the correlation is ~ 0.97 (R2 ~ 0.94) in the infrared and 0.88 (R2 ~ 0.77) in the visible wavelengths assuming that snow layer consists of aggregate of 5 plate ice habit with effective radius ~ 83.41 μm. Largest differences between simulated and measured values are observed in glint, i.e. in the angular regions of specular and near-specular reflection, with relative azimuth angles < ± 40° in forward scattering direction. The absolute difference between the modeled results and measurements in off-glint regions with viewing zenith angle less than 50° is generally small ~ ± 0.025 and does not exceed ± 0.05. These results will help to improve snow surface reflectance in the snow-atmosphere system algorithms designed to retrieve atmospheric parameters such as aerosol optical thickness in the Polar Regions.

Soheila Jafariserajehlou et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

Soheila Jafariserajehlou et al.

Soheila Jafariserajehlou et al.

Viewed

Total article views: 339 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
243 88 8 339 8 9
  • HTML: 243
  • PDF: 88
  • XML: 8
  • Total: 339
  • BibTeX: 8
  • EndNote: 9
Views and downloads (calculated since 09 Apr 2020)
Cumulative views and downloads (calculated since 09 Apr 2020)

Viewed (geographical distribution)

Total article views: 275 (including HTML, PDF, and XML) Thereof 272 with geography defined and 3 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 24 Oct 2020
Publications Copernicus
Download
Short summary
In this work, we study the retrieval of snow grain morphologies and their impact on the reflectance in a coupled snow-atmosphere system. We present a sensitivity study to highlight the importance of having adequate information about snow and atmosphere. A novel two-stage algorithm to retrieve the size and shape of snow grains is presented. The reflectance simulation results are compared with that of airborne measurements; the high correlation of 0.98 at IR and 0.88–98 at VIS channel is achieved.
In this work, we study the retrieval of snow grain morphologies and their impact on the...
Citation