An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets
Low-level atmospheric jets have been observed to occur frequently in marginal ice zones (MIZs), but little research has been done on the dynamics of these features. In the fall of 2015, during the Office of Naval Research Sea State cruise in the Beaufort Sea, the research team used radiosondes and s...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/AD1031493 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1031493 |
id |
ftdtic:AD1031493 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:AD1031493 2023-05-15T15:12:22+02:00 An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets Price,David M Naval Postgraduate School Monterey United States 2016-12-01 text/html http://www.dtic.mil/docs/citations/AD1031493 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1031493 en eng http://www.dtic.mil/docs/citations/AD1031493 Approved For Public Release; Snow Ice and Permafrost meteorology temperature gradients weather forecasting boundary layer geostrophic wind high pressure pressure gradients arctic ocean sea breeze wind direction dew point marginal ice zones temperature inversion DROPSONDES naval research low level jet atmospheric jets Text 2016 ftdtic 2017-10-15T14:48:40Z Low-level atmospheric jets have been observed to occur frequently in marginal ice zones (MIZs), but little research has been done on the dynamics of these features. In the fall of 2015, during the Office of Naval Research Sea State cruise in the Beaufort Sea, the research team used radiosondes and shipboard instrumentation to detect several atmospheric jets in the atmospheric boundary layer or in the capping temperature inversion just above. The three strongest jets had maximum wind speeds at elevations near 350 m to 400 m elevation; one of these jets had a secondary maximum wind height at 900 m. Different theories have been suggested as reasons for the existence of MIZ jets, but in all the cases examined it appeared that the primary cause of the low-level jets was a thermal wind effect where the thermal wind opposes the geostrophic wind due to horizontal temperature changes in the atmospheric boundary layer and capping inversion. The jets were detected using rawinsonde measurements, complemented by daily runs of the ECMWF model. By comparing soundings that were perpendicular to the thermal gradients, it was possible to calculate how the geostrophic wind would vary with elevation. In most cases, the comparisons of the calculated thermal wind matched well with the observed winds in the upper part of the boundary layer, thus indicating that the low-level jets were primarily a result of a thermal wind opposing the background geostrophic wind. At the lowest levels, the observed winds speeds were less than the calculated geostrophic wind, as expected, due to friction. Text Arctic Arctic Ocean Beaufort Sea Ice permafrost Defense Technical Information Center: DTIC Technical Reports database Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost meteorology temperature gradients weather forecasting boundary layer geostrophic wind high pressure pressure gradients arctic ocean sea breeze wind direction dew point marginal ice zones temperature inversion DROPSONDES naval research low level jet atmospheric jets |
spellingShingle |
Snow Ice and Permafrost meteorology temperature gradients weather forecasting boundary layer geostrophic wind high pressure pressure gradients arctic ocean sea breeze wind direction dew point marginal ice zones temperature inversion DROPSONDES naval research low level jet atmospheric jets Price,David M An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets |
topic_facet |
Snow Ice and Permafrost meteorology temperature gradients weather forecasting boundary layer geostrophic wind high pressure pressure gradients arctic ocean sea breeze wind direction dew point marginal ice zones temperature inversion DROPSONDES naval research low level jet atmospheric jets |
description |
Low-level atmospheric jets have been observed to occur frequently in marginal ice zones (MIZs), but little research has been done on the dynamics of these features. In the fall of 2015, during the Office of Naval Research Sea State cruise in the Beaufort Sea, the research team used radiosondes and shipboard instrumentation to detect several atmospheric jets in the atmospheric boundary layer or in the capping temperature inversion just above. The three strongest jets had maximum wind speeds at elevations near 350 m to 400 m elevation; one of these jets had a secondary maximum wind height at 900 m. Different theories have been suggested as reasons for the existence of MIZ jets, but in all the cases examined it appeared that the primary cause of the low-level jets was a thermal wind effect where the thermal wind opposes the geostrophic wind due to horizontal temperature changes in the atmospheric boundary layer and capping inversion. The jets were detected using rawinsonde measurements, complemented by daily runs of the ECMWF model. By comparing soundings that were perpendicular to the thermal gradients, it was possible to calculate how the geostrophic wind would vary with elevation. In most cases, the comparisons of the calculated thermal wind matched well with the observed winds in the upper part of the boundary layer, thus indicating that the low-level jets were primarily a result of a thermal wind opposing the background geostrophic wind. At the lowest levels, the observed winds speeds were less than the calculated geostrophic wind, as expected, due to friction. |
author2 |
Naval Postgraduate School Monterey United States |
format |
Text |
author |
Price,David M |
author_facet |
Price,David M |
author_sort |
Price,David M |
title |
An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets |
title_short |
An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets |
title_full |
An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets |
title_fullStr |
An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets |
title_full_unstemmed |
An Observational and Analytical Study of Marginal Ice Zone Atmospheric Jets |
title_sort |
observational and analytical study of marginal ice zone atmospheric jets |
publishDate |
2016 |
url |
http://www.dtic.mil/docs/citations/AD1031493 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1031493 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Beaufort Sea Ice permafrost |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Ice permafrost |
op_relation |
http://www.dtic.mil/docs/citations/AD1031493 |
op_rights |
Approved For Public Release; |
_version_ |
1766343060862533632 |