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...
Main Authors: | , , , , , , , |
---|---|
Other Authors: | , , , |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://dspace.library.uu.nl/handle/1874/412330 |
id |
ftunivutrecht:oai:dspace.library.uu.nl:1874/412330 |
---|---|
record_format |
openpolar |
spelling |
ftunivutrecht:oai:dspace.library.uu.nl:1874/412330 2023-12-10T09:49:06+01:00 Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect van Tiggelen, Maurice Smeets, Paul Reijmer, Carleen Wouters, Bert Steiner, Jakob Nieuwstraten, Emile Immerzeel, Walter van den Broeke, Michiel Marine and Atmospheric Research Sub Dynamics Meteorology Landscape functioning, Geocomputation and Hydrology Hydrologie 2021-06-11 application/pdf https://dspace.library.uu.nl/handle/1874/412330 eng eng https://dspace.library.uu.nl/handle/1874/412330 info:eu-repo/semantics/OpenAccess 2021 ftunivutrecht 2023-11-15T23:17:25Z 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 spatiooral 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. Other/Unknown Material Greenland Ice Sheet Utrecht University Repository Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
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 spatiooral 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. |
author2 |
Marine and Atmospheric Research Sub Dynamics Meteorology Landscape functioning, Geocomputation and Hydrology Hydrologie |
author |
van Tiggelen, Maurice Smeets, Paul Reijmer, Carleen Wouters, Bert Steiner, Jakob Nieuwstraten, Emile Immerzeel, Walter van den Broeke, Michiel |
spellingShingle |
van Tiggelen, Maurice Smeets, Paul Reijmer, Carleen Wouters, Bert Steiner, Jakob Nieuwstraten, Emile Immerzeel, Walter van den Broeke, Michiel Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: evaluation over the K-transect |
author_facet |
van Tiggelen, Maurice Smeets, Paul Reijmer, Carleen Wouters, Bert Steiner, Jakob Nieuwstraten, Emile Immerzeel, Walter van den Broeke, Michiel |
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 |
publishDate |
2021 |
url |
https://dspace.library.uu.nl/handle/1874/412330 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://dspace.library.uu.nl/handle/1874/412330 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784893397632286720 |