Spatial structures in the heat budget of the Antarctic atmospheric boundary layer
Output from the regional climate model RACMO2/ANT is used to calculate the heat budget of the Antarctic atmospheric boundary layer (ABL). The main feature of the wintertime Antarctic ABL is a persistent temperature deficit compared to the free atmosphere. The magnitude of this deficit is controlled...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:82cdcafcd0ff42ba9e010e0b437f050e 2023-05-15T13:44:50+02:00 Spatial structures in the heat budget of the Antarctic atmospheric boundary layer W. J. van de Berg M. R. van den Broeke E. van Meijgaard 2008-01-01 http://www.the-cryosphere.net/2/1/2008/tc-2-1-2008.pdf https://doaj.org/article/82cdcafcd0ff42ba9e010e0b437f050e en eng Copernicus Publications 1994-0416 1994-0424 http://www.the-cryosphere.net/2/1/2008/tc-2-1-2008.pdf https://doaj.org/article/82cdcafcd0ff42ba9e010e0b437f050e undefined The Cryosphere, Vol 2, Iss 1, Pp 1-12 (2008) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2008 fttriple 2023-01-22T18:19:04Z Output from the regional climate model RACMO2/ANT is used to calculate the heat budget of the Antarctic atmospheric boundary layer (ABL). The main feature of the wintertime Antarctic ABL is a persistent temperature deficit compared to the free atmosphere. The magnitude of this deficit is controlled by the heat budget. During winter, transport of heat towards the surface by turbulence and net longwave emission are the primary ABL cooling terms. These processes show horizontal spatial variability only on continental scales. Vertical and horizontal, i.e. along-slope, advection of heat are the main warming terms. Over regions with convex ice sheet topography, i.e. domes and ridges, warming by downward vertical advection is enhanced due to divergence of the ABL wind field. Horizontal advection balances excess warming caused by vertical advection, hence the temperature deficit in the ABL weakens over domes and ridges along the prevailing katabatic wind. Conversely, vertical advection is reduced in regions with concave topography, i.e. valleys, where the ABL temperature deficit enlarges along the katabatic wind. Along the coast, horizontal and vertical advection is governed by the inability of the large-scale circulation to adapt to small scale topographic features. Meso-scale topographic structures have thus a strong impact on the ABL winter temperature, besides latitude and surface elevation. During summer, this mechanism is much weaker, and the horizontal variability of ABL temperatures is smaller. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet The Cryosphere Unknown Antarctic The Antarctic |
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English |
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geo envir W. J. van de Berg M. R. van den Broeke E. van Meijgaard Spatial structures in the heat budget of the Antarctic atmospheric boundary layer |
topic_facet |
geo envir |
description |
Output from the regional climate model RACMO2/ANT is used to calculate the heat budget of the Antarctic atmospheric boundary layer (ABL). The main feature of the wintertime Antarctic ABL is a persistent temperature deficit compared to the free atmosphere. The magnitude of this deficit is controlled by the heat budget. During winter, transport of heat towards the surface by turbulence and net longwave emission are the primary ABL cooling terms. These processes show horizontal spatial variability only on continental scales. Vertical and horizontal, i.e. along-slope, advection of heat are the main warming terms. Over regions with convex ice sheet topography, i.e. domes and ridges, warming by downward vertical advection is enhanced due to divergence of the ABL wind field. Horizontal advection balances excess warming caused by vertical advection, hence the temperature deficit in the ABL weakens over domes and ridges along the prevailing katabatic wind. Conversely, vertical advection is reduced in regions with concave topography, i.e. valleys, where the ABL temperature deficit enlarges along the katabatic wind. Along the coast, horizontal and vertical advection is governed by the inability of the large-scale circulation to adapt to small scale topographic features. Meso-scale topographic structures have thus a strong impact on the ABL winter temperature, besides latitude and surface elevation. During summer, this mechanism is much weaker, and the horizontal variability of ABL temperatures is smaller. |
format |
Article in Journal/Newspaper |
author |
W. J. van de Berg M. R. van den Broeke E. van Meijgaard |
author_facet |
W. J. van de Berg M. R. van den Broeke E. van Meijgaard |
author_sort |
W. J. van de Berg |
title |
Spatial structures in the heat budget of the Antarctic atmospheric boundary layer |
title_short |
Spatial structures in the heat budget of the Antarctic atmospheric boundary layer |
title_full |
Spatial structures in the heat budget of the Antarctic atmospheric boundary layer |
title_fullStr |
Spatial structures in the heat budget of the Antarctic atmospheric boundary layer |
title_full_unstemmed |
Spatial structures in the heat budget of the Antarctic atmospheric boundary layer |
title_sort |
spatial structures in the heat budget of the antarctic atmospheric boundary layer |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
http://www.the-cryosphere.net/2/1/2008/tc-2-1-2008.pdf https://doaj.org/article/82cdcafcd0ff42ba9e010e0b437f050e |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 2, Iss 1, Pp 1-12 (2008) |
op_relation |
1994-0416 1994-0424 http://www.the-cryosphere.net/2/1/2008/tc-2-1-2008.pdf https://doaj.org/article/82cdcafcd0ff42ba9e010e0b437f050e |
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_version_ |
1766207313635442688 |