Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic
Abstract The modeling of the atmospheric boundary layer over sea ice is still challenging because of the complex interaction between clouds, radiation and turbulence over the often inhomogeneous sea ice cover. There is still much uncertainty concerning sea ice roughness, near‐surface thermal stabili...
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ftdoajarticles:oai:doaj.org/article:6c9067fff1544f5cb9aba6c3f08a8ae4 2023-05-15T14:41:20+02:00 Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic Thea Schneider Christof Lüpkes Wolfgang Dorn Dmitry Chechin Dörthe Handorf Sara Khosravi Vladimir M. Gryanik Irina Makhotina Annette Rinke 2022-01-01T00:00:00Z https://doi.org/10.1002/asl.1066 https://doaj.org/article/6c9067fff1544f5cb9aba6c3f08a8ae4 EN eng Wiley https://doi.org/10.1002/asl.1066 https://doaj.org/toc/1530-261X 1530-261X doi:10.1002/asl.1066 https://doaj.org/article/6c9067fff1544f5cb9aba6c3f08a8ae4 Atmospheric Science Letters, Vol 23, Iss 1, Pp n/a-n/a (2022) Arctic atmospheric boundary layer regional climate modeling Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.1002/asl.1066 2022-12-31T12:40:46Z Abstract The modeling of the atmospheric boundary layer over sea ice is still challenging because of the complex interaction between clouds, radiation and turbulence over the often inhomogeneous sea ice cover. There is still much uncertainty concerning sea ice roughness, near‐surface thermal stability and related processes, and their accurate parameterization. Here, a regional Arctic climate model forced by ERA‐Interim data was used to test the sensitivity of climate simulations to a modified surface flux parameterization for wintertime conditions over the Arctic. The reference parameterization as well as the modified one is based on Monin–Obukhov similarity theory, but different roughness lengths were prescribed and the stability dependence of the transfer coefficients for momentum, heat and moisture differed from each other. The modified parameterization accounts for the most comprehensive observations that are presently available over sea ice in the inner Arctic. Independent of the parameterization used, the model was able to reproduce the two observed dominant winter states with respect to cloud cover and longwave radiation. A stepwise use of the different parameterization assumptions showed that modifications of both surface roughness and stability dependence had a considerable impact on quantities such as air pressure, wind and near‐surface turbulent fluxes. However, the reduction of surface roughness to values agreeing with those observed during the Surface Heat Budget of the Arctic Ocean campaign led to an improvement in the western Arctic, while the modified stability parameterization had only a minor impact. The latter could be traced back to the model's underestimation of the strength of stability over sea ice. Future work should concentrate on possible reasons for this underestimation and on the question of generality of the results for other climate models. Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Surface Heat Budget of the Arctic Ocean Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Atmospheric Science Letters 23 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic atmospheric boundary layer regional climate modeling Meteorology. Climatology QC851-999 |
spellingShingle |
Arctic atmospheric boundary layer regional climate modeling Meteorology. Climatology QC851-999 Thea Schneider Christof Lüpkes Wolfgang Dorn Dmitry Chechin Dörthe Handorf Sara Khosravi Vladimir M. Gryanik Irina Makhotina Annette Rinke Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic |
topic_facet |
Arctic atmospheric boundary layer regional climate modeling Meteorology. Climatology QC851-999 |
description |
Abstract The modeling of the atmospheric boundary layer over sea ice is still challenging because of the complex interaction between clouds, radiation and turbulence over the often inhomogeneous sea ice cover. There is still much uncertainty concerning sea ice roughness, near‐surface thermal stability and related processes, and their accurate parameterization. Here, a regional Arctic climate model forced by ERA‐Interim data was used to test the sensitivity of climate simulations to a modified surface flux parameterization for wintertime conditions over the Arctic. The reference parameterization as well as the modified one is based on Monin–Obukhov similarity theory, but different roughness lengths were prescribed and the stability dependence of the transfer coefficients for momentum, heat and moisture differed from each other. The modified parameterization accounts for the most comprehensive observations that are presently available over sea ice in the inner Arctic. Independent of the parameterization used, the model was able to reproduce the two observed dominant winter states with respect to cloud cover and longwave radiation. A stepwise use of the different parameterization assumptions showed that modifications of both surface roughness and stability dependence had a considerable impact on quantities such as air pressure, wind and near‐surface turbulent fluxes. However, the reduction of surface roughness to values agreeing with those observed during the Surface Heat Budget of the Arctic Ocean campaign led to an improvement in the western Arctic, while the modified stability parameterization had only a minor impact. The latter could be traced back to the model's underestimation of the strength of stability over sea ice. Future work should concentrate on possible reasons for this underestimation and on the question of generality of the results for other climate models. |
format |
Article in Journal/Newspaper |
author |
Thea Schneider Christof Lüpkes Wolfgang Dorn Dmitry Chechin Dörthe Handorf Sara Khosravi Vladimir M. Gryanik Irina Makhotina Annette Rinke |
author_facet |
Thea Schneider Christof Lüpkes Wolfgang Dorn Dmitry Chechin Dörthe Handorf Sara Khosravi Vladimir M. Gryanik Irina Makhotina Annette Rinke |
author_sort |
Thea Schneider |
title |
Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic |
title_short |
Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic |
title_full |
Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic |
title_fullStr |
Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic |
title_full_unstemmed |
Sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: A case study with a regional climate model over the Arctic |
title_sort |
sensitivity to changes in the surface‐layer turbulence parameterization for stable conditions in winter: a case study with a regional climate model over the arctic |
publisher |
Wiley |
publishDate |
2022 |
url |
https://doi.org/10.1002/asl.1066 https://doaj.org/article/6c9067fff1544f5cb9aba6c3f08a8ae4 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice Surface Heat Budget of the Arctic Ocean |
genre_facet |
Arctic Arctic Ocean Sea ice Surface Heat Budget of the Arctic Ocean |
op_source |
Atmospheric Science Letters, Vol 23, Iss 1, Pp n/a-n/a (2022) |
op_relation |
https://doi.org/10.1002/asl.1066 https://doaj.org/toc/1530-261X 1530-261X doi:10.1002/asl.1066 https://doaj.org/article/6c9067fff1544f5cb9aba6c3f08a8ae4 |
op_doi |
https://doi.org/10.1002/asl.1066 |
container_title |
Atmospheric Science Letters |
container_volume |
23 |
container_issue |
1 |
_version_ |
1766313122026487808 |