Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions
The size and shape of snow grains directly impacts the reflection by a snowpack. In this article, different approaches to retrieve the optical-equivalent snow grain size (ropt) or, alternatively, the specific surface area (SSA) using satellite, airborne, and ground-based observations are compared an...
Published in: | Remote Sensing |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | http://hdl.handle.net/10852/91728 http://urn.nb.no/URN:NBN:no-94287 https://doi.org/10.3390/rs13234904 |
id |
ftoslouniv:oai:www.duo.uio.no:10852/91728 |
---|---|
record_format |
openpolar |
spelling |
ftoslouniv:oai:www.duo.uio.no:10852/91728 2024-09-30T14:21:56+00:00 Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions Jäkel, Evelyn Carlsen, Tim Ehrlich, André Wendisch, Manfred Schäfer, Michael Rosenburg, Sophie Nakoudi, Konstantina Zanatta, Marco Birnbaum, Gerit Helm, Veit Herber, Andreas Istomina, Larysa Mei, Linlu Rohde, Anika 2022-02-05T13:45:04Z http://hdl.handle.net/10852/91728 http://urn.nb.no/URN:NBN:no-94287 https://doi.org/10.3390/rs13234904 EN eng http://urn.nb.no/URN:NBN:no-94287 Jäkel, Evelyn Carlsen, Tim Ehrlich, André Wendisch, Manfred Schäfer, Michael Rosenburg, Sophie Nakoudi, Konstantina Zanatta, Marco Birnbaum, Gerit Helm, Veit Herber, Andreas Istomina, Larysa Mei, Linlu Rohde, Anika . Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions. Remote Sensing. 2021 http://hdl.handle.net/10852/91728 1998078 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Remote Sensing&rft.volume=&rft.spage=&rft.date=2021 Remote Sensing 13 23 https://doi.org/10.3390/rs13234904 URN:NBN:no-94287 Fulltext https://www.duo.uio.no/bitstream/handle/10852/91728/1/remotesensing-13-04904-v2.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 2072-4292 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2022 ftoslouniv https://doi.org/10.3390/rs13234904 2024-09-12T05:44:04Z The size and shape of snow grains directly impacts the reflection by a snowpack. In this article, different approaches to retrieve the optical-equivalent snow grain size (ropt) or, alternatively, the specific surface area (SSA) using satellite, airborne, and ground-based observations are compared and used to evaluate ICON-ART (ICOsahedral Nonhydrostatic—Aerosols and Reactive Trace gases) simulations. The retrieval methods are based on optical measurements and rely on the ropt-dependent absorption of solar radiation in snow. The measurement data were taken during a three-week campaign that was conducted in the North of Greenland in March/April 2018, such that the retrieval methods and radiation measurements are affected by enhanced uncertainties under these low-Sun conditions. An adjusted airborne retrieval method is applied which uses the albedo at 1700 nm wavelength and combines an atmospheric and snow radiative transfer model to account for the direct-to-global fraction of the solar radiation incident on the snow. From this approach, we achieved a significantly improved uncertainty (<25%) and a reduced effect of atmospheric masking compared to the previous method. Ground-based in situ measurements indicated an increase of ropt of 15 µm within a five-day period after a snowfall event which is small compared to previous observations under similar temperature regimes. ICON-ART captured the observed change of ropt during snowfall events, but systematically overestimated the subsequent snow grain growth by about 100%. Adjusting the growth rate factor to 0.012 µm2 s−1 minimized the difference between model and observations. Satellite-based and airborne retrieval methods showed higher ropt over sea ice (<300 µm) than over land surfaces (<100 µm) which was reduced by data filtering of surface roughness features. Moderate-Resolution Imaging Spectroradiometer (MODIS) retrievals revealed a large spread within a series of subsequent individual overpasses, indicating their limitations in observing the snow grain ... Article in Journal/Newspaper albedo Arctic Arctic Greenland Sea ice Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Greenland Remote Sensing 13 23 4904 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The size and shape of snow grains directly impacts the reflection by a snowpack. In this article, different approaches to retrieve the optical-equivalent snow grain size (ropt) or, alternatively, the specific surface area (SSA) using satellite, airborne, and ground-based observations are compared and used to evaluate ICON-ART (ICOsahedral Nonhydrostatic—Aerosols and Reactive Trace gases) simulations. The retrieval methods are based on optical measurements and rely on the ropt-dependent absorption of solar radiation in snow. The measurement data were taken during a three-week campaign that was conducted in the North of Greenland in March/April 2018, such that the retrieval methods and radiation measurements are affected by enhanced uncertainties under these low-Sun conditions. An adjusted airborne retrieval method is applied which uses the albedo at 1700 nm wavelength and combines an atmospheric and snow radiative transfer model to account for the direct-to-global fraction of the solar radiation incident on the snow. From this approach, we achieved a significantly improved uncertainty (<25%) and a reduced effect of atmospheric masking compared to the previous method. Ground-based in situ measurements indicated an increase of ropt of 15 µm within a five-day period after a snowfall event which is small compared to previous observations under similar temperature regimes. ICON-ART captured the observed change of ropt during snowfall events, but systematically overestimated the subsequent snow grain growth by about 100%. Adjusting the growth rate factor to 0.012 µm2 s−1 minimized the difference between model and observations. Satellite-based and airborne retrieval methods showed higher ropt over sea ice (<300 µm) than over land surfaces (<100 µm) which was reduced by data filtering of surface roughness features. Moderate-Resolution Imaging Spectroradiometer (MODIS) retrievals revealed a large spread within a series of subsequent individual overpasses, indicating their limitations in observing the snow grain ... |
format |
Article in Journal/Newspaper |
author |
Jäkel, Evelyn Carlsen, Tim Ehrlich, André Wendisch, Manfred Schäfer, Michael Rosenburg, Sophie Nakoudi, Konstantina Zanatta, Marco Birnbaum, Gerit Helm, Veit Herber, Andreas Istomina, Larysa Mei, Linlu Rohde, Anika |
spellingShingle |
Jäkel, Evelyn Carlsen, Tim Ehrlich, André Wendisch, Manfred Schäfer, Michael Rosenburg, Sophie Nakoudi, Konstantina Zanatta, Marco Birnbaum, Gerit Helm, Veit Herber, Andreas Istomina, Larysa Mei, Linlu Rohde, Anika Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions |
author_facet |
Jäkel, Evelyn Carlsen, Tim Ehrlich, André Wendisch, Manfred Schäfer, Michael Rosenburg, Sophie Nakoudi, Konstantina Zanatta, Marco Birnbaum, Gerit Helm, Veit Herber, Andreas Istomina, Larysa Mei, Linlu Rohde, Anika |
author_sort |
Jäkel, Evelyn |
title |
Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions |
title_short |
Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions |
title_full |
Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions |
title_fullStr |
Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions |
title_full_unstemmed |
Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions |
title_sort |
measurements and modeling of optical-equivalent snow grain sizes under arctic low-sun conditions |
publishDate |
2022 |
url |
http://hdl.handle.net/10852/91728 http://urn.nb.no/URN:NBN:no-94287 https://doi.org/10.3390/rs13234904 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
albedo Arctic Arctic Greenland Sea ice |
genre_facet |
albedo Arctic Arctic Greenland Sea ice |
op_source |
2072-4292 |
op_relation |
http://urn.nb.no/URN:NBN:no-94287 Jäkel, Evelyn Carlsen, Tim Ehrlich, André Wendisch, Manfred Schäfer, Michael Rosenburg, Sophie Nakoudi, Konstantina Zanatta, Marco Birnbaum, Gerit Helm, Veit Herber, Andreas Istomina, Larysa Mei, Linlu Rohde, Anika . Measurements and Modeling of Optical-Equivalent Snow Grain Sizes under Arctic Low-Sun Conditions. Remote Sensing. 2021 http://hdl.handle.net/10852/91728 1998078 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Remote Sensing&rft.volume=&rft.spage=&rft.date=2021 Remote Sensing 13 23 https://doi.org/10.3390/rs13234904 URN:NBN:no-94287 Fulltext https://www.duo.uio.no/bitstream/handle/10852/91728/1/remotesensing-13-04904-v2.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs13234904 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
23 |
container_start_page |
4904 |
_version_ |
1811646337287979008 |