Evolution of a storm-driven cloudy boundary layer in the Arctic
The cloudy boundary layer under stormy conditions during the summertime Arctic has been studied using observation from the SHEBA experiment and large-eddy simulations (LES). On 29 July 1998, a stable Arctic cloudy boundary layer event was observed after passage of a synoptic low. The local dynamic a...
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Lawrence Livermore National Laboratory
2003
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ftunivnotexas:info:ark/67531/metadc879308 2023-05-15T14:55:38+02:00 Evolution of a storm-driven cloudy boundary layer in the Arctic Inoue, J Kosovic, B Curry, J A United States. Department of Energy. 2003-10-24 PDF-file: 30 pages; size: 0.7 Mbytes Text http://digital.library.unt.edu/ark:/67531/metadc879308/ English eng Lawrence Livermore National Laboratory rep-no: UCRL-JRNL-201139 grantno: W-7405-ENG-48 osti: 894329 http://digital.library.unt.edu/ark:/67531/metadc879308/ ark: ark:/67531/metadc879308 Journal Name: Boundary-Layer Meteorology, vol. 117, no. 2, November 1, 2005, pp. 213-230 Turbulence Clouds Radiations Sensitivity 58 Geosciences Thermodynamics 71 Classical And Quantum Mechanics General Physics Production Aircraft 54 Environmental Sciences Advection Kinetic Energy Radiative Cooling Boundary Layers Shear Article 2003 ftunivnotexas 2016-12-03T23:11:48Z The cloudy boundary layer under stormy conditions during the summertime Arctic has been studied using observation from the SHEBA experiment and large-eddy simulations (LES). On 29 July 1998, a stable Arctic cloudy boundary layer event was observed after passage of a synoptic low. The local dynamic and thermodynamic structure of the boundary layer was determined from aircraft measurement including analysis of turbulence, cloud microphysics and radiative properties. After the upper cloud layer advected over the existing cloud layer, the turbulent kinetic energy budget indicated that the cloud layer below 200 m was maintained predominantly by shear production. Observations of longwave radiation showed that cloud top cooling at the lower cloud top has been suppressed by radiative effects of the upper cloud layer. Our LES results demonstrate the importance of the combination of shear mixing near the surface and radiative cooling at the cloud top in the storm-driven cloudy boundary layer. Once the low-level cloud reaches a certain height, depending on the amount of cloud-top cooling, the two sources of TKE production begin to separate in space under continuous stormy conditions, suggesting one possible mechanism for the cloud layering. The sensitivity tests suggest that the storm-driven cloudy boundary layer is flexibly switched to the shear-driven system due to the advection of upper clouds or the buoyantly driven system due to the lack of the wind shear. A comparison is made of this storm-driven boundary layer with the buoyantly driven boundary layer previously described in the literature. Article in Journal/Newspaper Arctic University of North Texas: UNT Digital Library Arctic |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Turbulence Clouds Radiations Sensitivity 58 Geosciences Thermodynamics 71 Classical And Quantum Mechanics General Physics Production Aircraft 54 Environmental Sciences Advection Kinetic Energy Radiative Cooling Boundary Layers Shear |
spellingShingle |
Turbulence Clouds Radiations Sensitivity 58 Geosciences Thermodynamics 71 Classical And Quantum Mechanics General Physics Production Aircraft 54 Environmental Sciences Advection Kinetic Energy Radiative Cooling Boundary Layers Shear Inoue, J Kosovic, B Curry, J A Evolution of a storm-driven cloudy boundary layer in the Arctic |
topic_facet |
Turbulence Clouds Radiations Sensitivity 58 Geosciences Thermodynamics 71 Classical And Quantum Mechanics General Physics Production Aircraft 54 Environmental Sciences Advection Kinetic Energy Radiative Cooling Boundary Layers Shear |
description |
The cloudy boundary layer under stormy conditions during the summertime Arctic has been studied using observation from the SHEBA experiment and large-eddy simulations (LES). On 29 July 1998, a stable Arctic cloudy boundary layer event was observed after passage of a synoptic low. The local dynamic and thermodynamic structure of the boundary layer was determined from aircraft measurement including analysis of turbulence, cloud microphysics and radiative properties. After the upper cloud layer advected over the existing cloud layer, the turbulent kinetic energy budget indicated that the cloud layer below 200 m was maintained predominantly by shear production. Observations of longwave radiation showed that cloud top cooling at the lower cloud top has been suppressed by radiative effects of the upper cloud layer. Our LES results demonstrate the importance of the combination of shear mixing near the surface and radiative cooling at the cloud top in the storm-driven cloudy boundary layer. Once the low-level cloud reaches a certain height, depending on the amount of cloud-top cooling, the two sources of TKE production begin to separate in space under continuous stormy conditions, suggesting one possible mechanism for the cloud layering. The sensitivity tests suggest that the storm-driven cloudy boundary layer is flexibly switched to the shear-driven system due to the advection of upper clouds or the buoyantly driven system due to the lack of the wind shear. A comparison is made of this storm-driven boundary layer with the buoyantly driven boundary layer previously described in the literature. |
author2 |
United States. Department of Energy. |
format |
Article in Journal/Newspaper |
author |
Inoue, J Kosovic, B Curry, J A |
author_facet |
Inoue, J Kosovic, B Curry, J A |
author_sort |
Inoue, J |
title |
Evolution of a storm-driven cloudy boundary layer in the Arctic |
title_short |
Evolution of a storm-driven cloudy boundary layer in the Arctic |
title_full |
Evolution of a storm-driven cloudy boundary layer in the Arctic |
title_fullStr |
Evolution of a storm-driven cloudy boundary layer in the Arctic |
title_full_unstemmed |
Evolution of a storm-driven cloudy boundary layer in the Arctic |
title_sort |
evolution of a storm-driven cloudy boundary layer in the arctic |
publisher |
Lawrence Livermore National Laboratory |
publishDate |
2003 |
url |
http://digital.library.unt.edu/ark:/67531/metadc879308/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Journal Name: Boundary-Layer Meteorology, vol. 117, no. 2, November 1, 2005, pp. 213-230 |
op_relation |
rep-no: UCRL-JRNL-201139 grantno: W-7405-ENG-48 osti: 894329 http://digital.library.unt.edu/ark:/67531/metadc879308/ ark: ark:/67531/metadc879308 |
_version_ |
1766327657198256128 |