The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica
The McMurdo Dry Valleys (MDV) are a polar desert, where glacial melt is the main source of water to streams and the ecosystem. Summer air temperatures are typically close to zero, and therefore foehn events can have a large impact on the meltwater production. A 14-month record of automatic weather s...
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ftdoajarticles:oai:doaj.org/article:c410f6fe08aa4136bc7fd0428edd24d1 2023-05-15T13:38:04+02:00 The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica M. G. Hofsteenge N. J. Cullen C. H. Reijmer M. van den Broeke M. Katurji J. F. Orwin 2022-12-01T00:00:00Z https://doi.org/10.5194/tc-16-5041-2022 https://doaj.org/article/c410f6fe08aa4136bc7fd0428edd24d1 EN eng Copernicus Publications https://tc.copernicus.org/articles/16/5041/2022/tc-16-5041-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-5041-2022 1994-0416 1994-0424 https://doaj.org/article/c410f6fe08aa4136bc7fd0428edd24d1 The Cryosphere, Vol 16, Pp 5041-5059 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/tc-16-5041-2022 2022-12-30T19:33:43Z The McMurdo Dry Valleys (MDV) are a polar desert, where glacial melt is the main source of water to streams and the ecosystem. Summer air temperatures are typically close to zero, and therefore foehn events can have a large impact on the meltwater production. A 14-month record of automatic weather station (AWS) data on Joyce Glacier is used to force a 1D surface energy balance model to study the impact of foehn events on the energy balance. AWS data and output of the Antarctic Mesoscale Prediction System (AMPS) on a 1.7 km grid are used to detect foehn events at the AWS site. Foehn events at Joyce Glacier occur under the presence of cyclones over the Ross Sea. The location of Joyce Glacier on the leeward side of the Royal Society Range during these synoptic events causes foehn warming through isentropic drawdown. This mechanism differs from the foehn warming through gap flow that was earlier found for other regions in the MDV and highlights the complex interaction of synoptic flow with local topography of the MDV. Shortwave radiation is the primary control on melt at Joyce Glacier, and melt often occurs with subzero air temperatures. During foehn events, melt rates are enhanced, contributing to 23 % of the total annual melt. Foehn winds cause a switch from a diurnal stability regime in the atmospheric surface layer to a continuous energy input from sensible heat flux throughout the day. The sensible heating during foehn, through an increase in turbulent mixing resulting from gustier and warmer wind conditions, is largely compensated for by extra heat losses through sublimation. Melt rates are enhanced through an additional energy surplus from a reduced albedo during foehn. Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Dry Valleys polar desert Ross Sea The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Ross Sea McMurdo Dry Valleys Royal Society Range ENVELOPE(162.667,162.667,-78.167,-78.167) Joyce Glacier ENVELOPE(163.700,163.700,-78.017,-78.017) The Cryosphere 16 12 5041 5059 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 M. G. Hofsteenge N. J. Cullen C. H. Reijmer M. van den Broeke M. Katurji J. F. Orwin The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The McMurdo Dry Valleys (MDV) are a polar desert, where glacial melt is the main source of water to streams and the ecosystem. Summer air temperatures are typically close to zero, and therefore foehn events can have a large impact on the meltwater production. A 14-month record of automatic weather station (AWS) data on Joyce Glacier is used to force a 1D surface energy balance model to study the impact of foehn events on the energy balance. AWS data and output of the Antarctic Mesoscale Prediction System (AMPS) on a 1.7 km grid are used to detect foehn events at the AWS site. Foehn events at Joyce Glacier occur under the presence of cyclones over the Ross Sea. The location of Joyce Glacier on the leeward side of the Royal Society Range during these synoptic events causes foehn warming through isentropic drawdown. This mechanism differs from the foehn warming through gap flow that was earlier found for other regions in the MDV and highlights the complex interaction of synoptic flow with local topography of the MDV. Shortwave radiation is the primary control on melt at Joyce Glacier, and melt often occurs with subzero air temperatures. During foehn events, melt rates are enhanced, contributing to 23 % of the total annual melt. Foehn winds cause a switch from a diurnal stability regime in the atmospheric surface layer to a continuous energy input from sensible heat flux throughout the day. The sensible heating during foehn, through an increase in turbulent mixing resulting from gustier and warmer wind conditions, is largely compensated for by extra heat losses through sublimation. Melt rates are enhanced through an additional energy surplus from a reduced albedo during foehn. |
format |
Article in Journal/Newspaper |
author |
M. G. Hofsteenge N. J. Cullen C. H. Reijmer M. van den Broeke M. Katurji J. F. Orwin |
author_facet |
M. G. Hofsteenge N. J. Cullen C. H. Reijmer M. van den Broeke M. Katurji J. F. Orwin |
author_sort |
M. G. Hofsteenge |
title |
The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica |
title_short |
The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica |
title_full |
The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica |
title_fullStr |
The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica |
title_full_unstemmed |
The surface energy balance during foehn events at Joyce Glacier, McMurdo Dry Valleys, Antarctica |
title_sort |
surface energy balance during foehn events at joyce glacier, mcmurdo dry valleys, antarctica |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-5041-2022 https://doaj.org/article/c410f6fe08aa4136bc7fd0428edd24d1 |
long_lat |
ENVELOPE(162.667,162.667,-78.167,-78.167) ENVELOPE(163.700,163.700,-78.017,-78.017) |
geographic |
Antarctic The Antarctic Ross Sea McMurdo Dry Valleys Royal Society Range Joyce Glacier |
geographic_facet |
Antarctic The Antarctic Ross Sea McMurdo Dry Valleys Royal Society Range Joyce Glacier |
genre |
Antarc* Antarctic Antarctica McMurdo Dry Valleys polar desert Ross Sea The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Dry Valleys polar desert Ross Sea The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 5041-5059 (2022) |
op_relation |
https://tc.copernicus.org/articles/16/5041/2022/tc-16-5041-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-5041-2022 1994-0416 1994-0424 https://doaj.org/article/c410f6fe08aa4136bc7fd0428edd24d1 |
op_doi |
https://doi.org/10.5194/tc-16-5041-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
12 |
container_start_page |
5041 |
op_container_end_page |
5059 |
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1766101124447731712 |