Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations
The analysis of surface heat fluxes and sounding profiles from SHEBA indicated possible significant effects of subsidence on the structure of stably-stratified ABLs (Mirocha et al. 2005). In this study the influence of the large-scale subsidence rate on the stably stratified atmospheric boundary lay...
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ftosti:oai:osti.gov:885125 2023-07-30T04:01:14+02:00 Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations Mirocha, J D Kosovic, B 2021-04-26 application/pdf http://www.osti.gov/servlets/purl/885125 https://www.osti.gov/biblio/885125 unknown http://www.osti.gov/servlets/purl/885125 https://www.osti.gov/biblio/885125 54 ENVIRONMENTAL SCIENCES ARCTIC OCEAN BOUNDARY LAYERS CLIMATES FORECASTING HEATING RATE SHEAR SIMULATION SKY TRANSPORT TURBULENCE WEATHER 2021 ftosti 2023-07-11T08:43:18Z The analysis of surface heat fluxes and sounding profiles from SHEBA indicated possible significant effects of subsidence on the structure of stably-stratified ABLs (Mirocha et al. 2005). In this study the influence of the large-scale subsidence rate on the stably stratified atmospheric boundary layer (ABL) over the Arctic Ocean during clear sky, winter conditions is investigated using a large-eddy simulation model. Simulations are conducted while varying the subsidence rate between 0, 0.001 and 0.002 ms{sup -1}, and the resulting quasi-equilibrium ABL structure and evolution are examined. Simulations conducted without subsidence yield ABLs that are deeper, more strongly mixed, and cool much more rapidly than were observed. The addition of a small subsidence rate significantly improves agreement between the simulations and observations regarding the ABL height, potential temperature profiles and bulk heating rates. Subsidence likewise alters the shapes of the surface-layer flux, stress and shear profiles, resulting in increased vertical transport of heat while decreasing vertical momentum transport. A brief discussion of the relevance of these results to parameterization of the stable ABL under subsiding conditions in large-scale numerical weather and climate prediction models is presented. Other/Unknown Material Arctic Arctic Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES ARCTIC OCEAN BOUNDARY LAYERS CLIMATES FORECASTING HEATING RATE SHEAR SIMULATION SKY TRANSPORT TURBULENCE WEATHER |
spellingShingle |
54 ENVIRONMENTAL SCIENCES ARCTIC OCEAN BOUNDARY LAYERS CLIMATES FORECASTING HEATING RATE SHEAR SIMULATION SKY TRANSPORT TURBULENCE WEATHER Mirocha, J D Kosovic, B Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations |
topic_facet |
54 ENVIRONMENTAL SCIENCES ARCTIC OCEAN BOUNDARY LAYERS CLIMATES FORECASTING HEATING RATE SHEAR SIMULATION SKY TRANSPORT TURBULENCE WEATHER |
description |
The analysis of surface heat fluxes and sounding profiles from SHEBA indicated possible significant effects of subsidence on the structure of stably-stratified ABLs (Mirocha et al. 2005). In this study the influence of the large-scale subsidence rate on the stably stratified atmospheric boundary layer (ABL) over the Arctic Ocean during clear sky, winter conditions is investigated using a large-eddy simulation model. Simulations are conducted while varying the subsidence rate between 0, 0.001 and 0.002 ms{sup -1}, and the resulting quasi-equilibrium ABL structure and evolution are examined. Simulations conducted without subsidence yield ABLs that are deeper, more strongly mixed, and cool much more rapidly than were observed. The addition of a small subsidence rate significantly improves agreement between the simulations and observations regarding the ABL height, potential temperature profiles and bulk heating rates. Subsidence likewise alters the shapes of the surface-layer flux, stress and shear profiles, resulting in increased vertical transport of heat while decreasing vertical momentum transport. A brief discussion of the relevance of these results to parameterization of the stable ABL under subsiding conditions in large-scale numerical weather and climate prediction models is presented. |
author |
Mirocha, J D Kosovic, B |
author_facet |
Mirocha, J D Kosovic, B |
author_sort |
Mirocha, J D |
title |
Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations |
title_short |
Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations |
title_full |
Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations |
title_fullStr |
Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations |
title_full_unstemmed |
Consequences of the Large-Scale Subsidence Rate on the Stably Stratified Atmospheric Boundary Layer Over the Arctic Ocean, as seen in Large-Eddy Simulations |
title_sort |
consequences of the large-scale subsidence rate on the stably stratified atmospheric boundary layer over the arctic ocean, as seen in large-eddy simulations |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/885125 https://www.osti.gov/biblio/885125 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
http://www.osti.gov/servlets/purl/885125 https://www.osti.gov/biblio/885125 |
_version_ |
1772811986923421696 |