A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer
The influence of the large-scale subsidence rate, S, on the stably stratified atmospheric boundary layer (ABL) over the Arctic Ocean snow/ice pack during clear-sky, winter conditions is investigated using a large-eddy simulation model. Simulations of two 24-h periods are conducted while varying S be...
Published in: | Boundary-Layer Meteorology |
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Language: | English |
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ftcdlib:qt3jk874f5 2023-05-15T14:57:43+02:00 A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer Mirocha, Jeffrey D. Kosović, Branko pp 1-21 2010-01-01 application/pdf http://www.escholarship.org/uc/item/3jk874f5 english eng eScholarship, University of California http://www.escholarship.org/uc/item/3jk874f5 qt3jk874f5 public Mirocha, Jeffrey D.; & Kosović, Branko. (2010). A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer. Boundary-Layer Meteorology: An International Journal of Physical, Chemical and Biological Processes in the Atmospheric Boundary Layer, 134(1), pp 1-21. doi:10.1007/s10546-009-9449-4. Retrieved from: http://www.escholarship.org/uc/item/3jk874f5 Earth Sciences Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology Arctic Ocean Large-eddy simulation Stable boundary layer Subsidence article 2010 ftcdlib https://doi.org/10.1007/s10546-009-9449-4 2016-04-02T18:46:58Z The influence of the large-scale subsidence rate, S, on the stably stratified atmospheric boundary layer (ABL) over the Arctic Ocean snow/ice pack during clear-sky, winter conditions is investigated using a large-eddy simulation model. Simulations of two 24-h periods are conducted while varying S between 0, 0.001 and 0.002 ms−1, and the resulting quasi-equilibrium ABL structures and evolutions are examined. Simulations conducted with S = 0 yield a boundary layer that is deeper, more strongly mixed and cools more rapidly than the observations. Simulations conducted with S > 0 yield improved agreement with the observations in the ABL height, potential temperature gradients and bulk heating rates. We also demonstrate that S > 0 limits the continuous growth of the ABL observed during quasi-steady conditions, leading to the formation of a nearly steady ABL of approximately uniform depth and temperature. Subsidence reduces the magnitudes of the stresses, as well as the implied eddy-diffusivity coefficients for momentum and heat, while increasing the vertical heat fluxes considerably. Subsidence is also observed to increases the Richardson number to values in excess of unity well below the ABL top. Article in Journal/Newspaper Arctic Arctic Ocean University of California: eScholarship Arctic Arctic Ocean Boundary-Layer Meteorology 134 1 1 21 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Earth Sciences Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology Arctic Ocean Large-eddy simulation Stable boundary layer Subsidence |
spellingShingle |
Earth Sciences Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology Arctic Ocean Large-eddy simulation Stable boundary layer Subsidence Mirocha, Jeffrey D. Kosović, Branko A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer |
topic_facet |
Earth Sciences Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology Arctic Ocean Large-eddy simulation Stable boundary layer Subsidence |
description |
The influence of the large-scale subsidence rate, S, on the stably stratified atmospheric boundary layer (ABL) over the Arctic Ocean snow/ice pack during clear-sky, winter conditions is investigated using a large-eddy simulation model. Simulations of two 24-h periods are conducted while varying S between 0, 0.001 and 0.002 ms−1, and the resulting quasi-equilibrium ABL structures and evolutions are examined. Simulations conducted with S = 0 yield a boundary layer that is deeper, more strongly mixed and cools more rapidly than the observations. Simulations conducted with S > 0 yield improved agreement with the observations in the ABL height, potential temperature gradients and bulk heating rates. We also demonstrate that S > 0 limits the continuous growth of the ABL observed during quasi-steady conditions, leading to the formation of a nearly steady ABL of approximately uniform depth and temperature. Subsidence reduces the magnitudes of the stresses, as well as the implied eddy-diffusivity coefficients for momentum and heat, while increasing the vertical heat fluxes considerably. Subsidence is also observed to increases the Richardson number to values in excess of unity well below the ABL top. |
format |
Article in Journal/Newspaper |
author |
Mirocha, Jeffrey D. Kosović, Branko |
author_facet |
Mirocha, Jeffrey D. Kosović, Branko |
author_sort |
Mirocha, Jeffrey D. |
title |
A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer |
title_short |
A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer |
title_full |
A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer |
title_fullStr |
A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer |
title_full_unstemmed |
A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer |
title_sort |
large-eddy simulation study of the influence of subsidence on the stably stratified atmospheric boundary layer |
publisher |
eScholarship, University of California |
publishDate |
2010 |
url |
http://www.escholarship.org/uc/item/3jk874f5 |
op_coverage |
pp 1-21 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Mirocha, Jeffrey D.; & Kosović, Branko. (2010). A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer. Boundary-Layer Meteorology: An International Journal of Physical, Chemical and Biological Processes in the Atmospheric Boundary Layer, 134(1), pp 1-21. doi:10.1007/s10546-009-9449-4. Retrieved from: http://www.escholarship.org/uc/item/3jk874f5 |
op_relation |
http://www.escholarship.org/uc/item/3jk874f5 qt3jk874f5 |
op_rights |
public |
op_doi |
https://doi.org/10.1007/s10546-009-9449-4 |
container_title |
Boundary-Layer Meteorology |
container_volume |
134 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
21 |
_version_ |
1766329845763014656 |