Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect
The aerodynamic roughness of heat, moisture, and momentum of a natural surface are important parameters in atmospheric models, as they co-determine the intensity of turbulent transfer between the atmosphere and the surface. Unfortunately this parameter is often poorly known, especially in remote are...
Published in: | The Cryosphere |
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Copernicus Publications
2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00056937 2023-05-15T16:28:13+02:00 Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Wouters, Bert Steiner, Jakob F. Nieuwstraten, Emile J. Immerzeel, Walter W. van den Broeke, Michiel R. 2021-06 electronic https://doi.org/10.5194/tc-15-2601-2021 https://noa.gwlb.de/receive/cop_mods_00056937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056587/tc-15-2601-2021.pdf https://tc.copernicus.org/articles/15/2601/2021/tc-15-2601-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-2601-2021 https://noa.gwlb.de/receive/cop_mods_00056937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056587/tc-15-2601-2021.pdf https://tc.copernicus.org/articles/15/2601/2021/tc-15-2601-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-2601-2021 2022-02-08T22:33:49Z The aerodynamic roughness of heat, moisture, and momentum of a natural surface are important parameters in atmospheric models, as they co-determine the intensity of turbulent transfer between the atmosphere and the surface. Unfortunately this parameter is often poorly known, especially in remote areas where neither high-resolution elevation models nor eddy-covariance measurements are available. In this study we adapt a bulk drag partitioning model to estimate the aerodynamic roughness length (z0m) such that it can be applied to 1D (i.e. unidirectional) elevation profiles, typically measured by laser altimeters. We apply the model to a rough ice surface on the K-transect (west Greenland Ice Sheet) using UAV photogrammetry, and we evaluate the modelled roughness against in situ eddy-covariance observations. We then present a method to estimate the topography at 1 m horizontal resolution using the ICESat-2 satellite laser altimeter, and we demonstrate the high precision of the satellite elevation profiles against UAV photogrammetry. The currently available satellite profiles are used to map the aerodynamic roughness during different time periods along the K-transect, that is compared to an extensive dataset of in situ observations. We find a considerable spatio-temporal variability in z0m, ranging between 10−4 m for a smooth snow surface and 10−1 m for rough crevassed areas, which confirms the need to incorporate a variable aerodynamic roughness in atmospheric models over ice sheets. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Niedersächsisches Online-Archiv NOA Greenland The Cryosphere 15 6 2601 2621 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Wouters, Bert Steiner, Jakob F. Nieuwstraten, Emile J. Immerzeel, Walter W. van den Broeke, Michiel R. Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
topic_facet |
article Verlagsveröffentlichung |
description |
The aerodynamic roughness of heat, moisture, and momentum of a natural surface are important parameters in atmospheric models, as they co-determine the intensity of turbulent transfer between the atmosphere and the surface. Unfortunately this parameter is often poorly known, especially in remote areas where neither high-resolution elevation models nor eddy-covariance measurements are available. In this study we adapt a bulk drag partitioning model to estimate the aerodynamic roughness length (z0m) such that it can be applied to 1D (i.e. unidirectional) elevation profiles, typically measured by laser altimeters. We apply the model to a rough ice surface on the K-transect (west Greenland Ice Sheet) using UAV photogrammetry, and we evaluate the modelled roughness against in situ eddy-covariance observations. We then present a method to estimate the topography at 1 m horizontal resolution using the ICESat-2 satellite laser altimeter, and we demonstrate the high precision of the satellite elevation profiles against UAV photogrammetry. The currently available satellite profiles are used to map the aerodynamic roughness during different time periods along the K-transect, that is compared to an extensive dataset of in situ observations. We find a considerable spatio-temporal variability in z0m, ranging between 10−4 m for a smooth snow surface and 10−1 m for rough crevassed areas, which confirms the need to incorporate a variable aerodynamic roughness in atmospheric models over ice sheets. |
format |
Article in Journal/Newspaper |
author |
van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Wouters, Bert Steiner, Jakob F. Nieuwstraten, Emile J. Immerzeel, Walter W. van den Broeke, Michiel R. |
author_facet |
van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Wouters, Bert Steiner, Jakob F. Nieuwstraten, Emile J. Immerzeel, Walter W. van den Broeke, Michiel R. |
author_sort |
van Tiggelen, Maurice |
title |
Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
title_short |
Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
title_full |
Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
title_fullStr |
Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
title_full_unstemmed |
Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
title_sort |
mapping the aerodynamic roughness of the greenland ice sheet surface using icesat-2: evaluation over the k-transect |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-2601-2021 https://noa.gwlb.de/receive/cop_mods_00056937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056587/tc-15-2601-2021.pdf https://tc.copernicus.org/articles/15/2601/2021/tc-15-2601-2021.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-2601-2021 https://noa.gwlb.de/receive/cop_mods_00056937 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056587/tc-15-2601-2021.pdf https://tc.copernicus.org/articles/15/2601/2021/tc-15-2601-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-15-2601-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
6 |
container_start_page |
2601 |
op_container_end_page |
2621 |
_version_ |
1766017852946513920 |