The foehn effect during easterly flow over Svalbard
This article presents a comprehensive analysis of the foehn episode which occurred over Svalbard on 30–31 May 2017. This episode is well documented by multiplatform measurements carried out during the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and Physical feedba...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-22-1529-2022 https://doaj.org/article/aff980309f9c4903b244f769ac15972a |
id |
ftdoajarticles:oai:doaj.org/article:aff980309f9c4903b244f769ac15972a |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:aff980309f9c4903b244f769ac15972a 2023-05-15T13:05:46+02:00 The foehn effect during easterly flow over Svalbard A. A. Shestakova D. G. Chechin C. Lüpkes J. Hartmann M. Maturilli 2022-02-01T00:00:00Z https://doi.org/10.5194/acp-22-1529-2022 https://doaj.org/article/aff980309f9c4903b244f769ac15972a EN eng Copernicus Publications https://acp.copernicus.org/articles/22/1529/2022/acp-22-1529-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-1529-2022 1680-7316 1680-7324 https://doaj.org/article/aff980309f9c4903b244f769ac15972a Atmospheric Chemistry and Physics, Vol 22, Pp 1529-1548 (2022) Physics QC1-999 Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.5194/acp-22-1529-2022 2022-12-31T16:15:38Z This article presents a comprehensive analysis of the foehn episode which occurred over Svalbard on 30–31 May 2017. This episode is well documented by multiplatform measurements carried out during the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and Physical feedbacks of Arctic PBL, Sea ice, Cloud And AerosoL (PASCAL) campaigns. Both orographic wind modification and foehn warming are considered here. The latter is found to be primarily produced by the isentropic drawdown, which is evident from observations and mesoscale numerical modeling. The structure of the observed foehn warming was in many aspects very similar to that for foehns over the Antarctic Peninsula. In particular, it is found that the warming was proportional to the height of the mountain ridges and propagated far downstream. Also, a strong spatial heterogeneity of the foehn warming was observed with a clear cold footprint associated with gap flows along the mountain valleys and fjords. On the downstream side, a shallow stably stratified boundary layer below a well-mixed layer formed over the snow-covered land and cold open water. The foehn warming downwind of Svalbard strengthened the north–south horizontal temperature gradient across the ice edge near the northern tip of Svalbard. This suggests that the associated baroclinicity might have strengthened the observed northern tip jet. A positive daytime radiative budget on the surface, increased by the foehn clearance, along with the downward sensible heat flux provoked accelerated snowmelt in the mountain valleys in Ny-Ålesund and Adventdalen, which suggests a potentially large effect of the frequently observed Svalbard foehns on the snow cover and the glacier heat and mass balance. Article in Journal/Newspaper Adventdalen Antarc* Antarctic Antarctic Peninsula Arctic glacier Ny Ålesund Ny-Ålesund Sea ice Svalbard Directory of Open Access Journals: DOAJ Articles Adventdalen ENVELOPE(16.264,16.264,78.181,78.181) Antarctic Antarctic Peninsula Arctic Ny-Ålesund Svalbard The Antarctic Atmospheric Chemistry and Physics 22 2 1529 1548 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 A. A. Shestakova D. G. Chechin C. Lüpkes J. Hartmann M. Maturilli The foehn effect during easterly flow over Svalbard |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
This article presents a comprehensive analysis of the foehn episode which occurred over Svalbard on 30–31 May 2017. This episode is well documented by multiplatform measurements carried out during the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and Physical feedbacks of Arctic PBL, Sea ice, Cloud And AerosoL (PASCAL) campaigns. Both orographic wind modification and foehn warming are considered here. The latter is found to be primarily produced by the isentropic drawdown, which is evident from observations and mesoscale numerical modeling. The structure of the observed foehn warming was in many aspects very similar to that for foehns over the Antarctic Peninsula. In particular, it is found that the warming was proportional to the height of the mountain ridges and propagated far downstream. Also, a strong spatial heterogeneity of the foehn warming was observed with a clear cold footprint associated with gap flows along the mountain valleys and fjords. On the downstream side, a shallow stably stratified boundary layer below a well-mixed layer formed over the snow-covered land and cold open water. The foehn warming downwind of Svalbard strengthened the north–south horizontal temperature gradient across the ice edge near the northern tip of Svalbard. This suggests that the associated baroclinicity might have strengthened the observed northern tip jet. A positive daytime radiative budget on the surface, increased by the foehn clearance, along with the downward sensible heat flux provoked accelerated snowmelt in the mountain valleys in Ny-Ålesund and Adventdalen, which suggests a potentially large effect of the frequently observed Svalbard foehns on the snow cover and the glacier heat and mass balance. |
format |
Article in Journal/Newspaper |
author |
A. A. Shestakova D. G. Chechin C. Lüpkes J. Hartmann M. Maturilli |
author_facet |
A. A. Shestakova D. G. Chechin C. Lüpkes J. Hartmann M. Maturilli |
author_sort |
A. A. Shestakova |
title |
The foehn effect during easterly flow over Svalbard |
title_short |
The foehn effect during easterly flow over Svalbard |
title_full |
The foehn effect during easterly flow over Svalbard |
title_fullStr |
The foehn effect during easterly flow over Svalbard |
title_full_unstemmed |
The foehn effect during easterly flow over Svalbard |
title_sort |
foehn effect during easterly flow over svalbard |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-1529-2022 https://doaj.org/article/aff980309f9c4903b244f769ac15972a |
long_lat |
ENVELOPE(16.264,16.264,78.181,78.181) |
geographic |
Adventdalen Antarctic Antarctic Peninsula Arctic Ny-Ålesund Svalbard The Antarctic |
geographic_facet |
Adventdalen Antarctic Antarctic Peninsula Arctic Ny-Ålesund Svalbard The Antarctic |
genre |
Adventdalen Antarc* Antarctic Antarctic Peninsula Arctic glacier Ny Ålesund Ny-Ålesund Sea ice Svalbard |
genre_facet |
Adventdalen Antarc* Antarctic Antarctic Peninsula Arctic glacier Ny Ålesund Ny-Ålesund Sea ice Svalbard |
op_source |
Atmospheric Chemistry and Physics, Vol 22, Pp 1529-1548 (2022) |
op_relation |
https://acp.copernicus.org/articles/22/1529/2022/acp-22-1529-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-1529-2022 1680-7316 1680-7324 https://doaj.org/article/aff980309f9c4903b244f769ac15972a |
op_doi |
https://doi.org/10.5194/acp-22-1529-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
2 |
container_start_page |
1529 |
op_container_end_page |
1548 |
_version_ |
1766393477820579840 |