Low-Level Baroclinic Jets Over the New Arctic Ocean
The article of record as published may be found at https://doi.org/10.1002/2018JC013778 During the Sea State cruise in the fall of 2015, in the Chukchi/Beaufort Sea region, there were five strong (>10 m s21) surface wind events associated with low-level atmospheric jets. These jets were ana- lyze...
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ftnavalpschool:oai:calhoun.nps.edu:10945/60236 2024-06-09T07:42:19+00:00 Low-Level Baroclinic Jets Over the New Arctic Ocean Guest, Peter Persson, P. Ola Wang, Shouping Jordan, Mary Jin, Yi Blomquist, Byron Fairall, Christopher Meteorology 2018-06 application/pdf https://hdl.handle.net/10945/60236 en_US eng Wiley Guest, Peter, et al. "Low‐Level Baroclinic Jets Over the New Arctic Ocean." Journal of Geophysical Research: Oceans (2018). DTIC Id124655 https://hdl.handle.net/10945/60236 Article 2018 ftnavalpschool 2024-05-15T00:16:48Z The article of record as published may be found at https://doi.org/10.1002/2018JC013778 During the Sea State cruise in the fall of 2015, in the Chukchi/Beaufort Sea region, there were five strong (>10 m s21) surface wind events associated with low-level atmospheric jets. These jets were ana- lyzed using rawinsonde observations, ship measurements, and a numerical forecast model. The jets occurred when easterly winds aligned with the ice edge, generating low-level baroclinicity in a direction favorable for increasing the geostrophic wind speed toward the surface. The maximum wind speed usually occurred at the top of the atmospheric boundary layer with wind speeds greater than 8 m s21 extending through the capping inversion to 2,000–3,000 m elevation, with winds decreasing toward the surface in the boundary layer due to friction. The width (crosswind) dimensions of the jets were 250–400 km and they existed downwind for as long as the winds remained generally parallel to the ice edges, typically several hundred kilometers. Thermal winds calculated from crosswind-oriented rawinsonde temperature profiles matched the observed vertical wind speed gradients in the inversion regions, indicating that the jets were in quasi-geostrophic (inversion layer) or quasi-frictional (boundary layer) balance, with low Rossby numbers. We define these as ‘‘baroclinic’’ type jets, which are distinct from ‘‘ice/sea breeze’’ type jets which flow more down the pressure and density gradients, and have high Rossby numbers. The operational model analyses matched the observations quite well, giving confidence that these types of jets can be simulated and pre- dicted as long as the models have sufficient resolution and accurately parameterize vertical heat fluxes. N0001413WX20830 Office of Naval Research Global Article in Journal/Newspaper Arctic Arctic Arctic Ocean Beaufort Sea Chukchi Naval Postgraduate School: Calhoun Arctic Arctic Ocean |
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Naval Postgraduate School: Calhoun |
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ftnavalpschool |
language |
English |
description |
The article of record as published may be found at https://doi.org/10.1002/2018JC013778 During the Sea State cruise in the fall of 2015, in the Chukchi/Beaufort Sea region, there were five strong (>10 m s21) surface wind events associated with low-level atmospheric jets. These jets were ana- lyzed using rawinsonde observations, ship measurements, and a numerical forecast model. The jets occurred when easterly winds aligned with the ice edge, generating low-level baroclinicity in a direction favorable for increasing the geostrophic wind speed toward the surface. The maximum wind speed usually occurred at the top of the atmospheric boundary layer with wind speeds greater than 8 m s21 extending through the capping inversion to 2,000–3,000 m elevation, with winds decreasing toward the surface in the boundary layer due to friction. The width (crosswind) dimensions of the jets were 250–400 km and they existed downwind for as long as the winds remained generally parallel to the ice edges, typically several hundred kilometers. Thermal winds calculated from crosswind-oriented rawinsonde temperature profiles matched the observed vertical wind speed gradients in the inversion regions, indicating that the jets were in quasi-geostrophic (inversion layer) or quasi-frictional (boundary layer) balance, with low Rossby numbers. We define these as ‘‘baroclinic’’ type jets, which are distinct from ‘‘ice/sea breeze’’ type jets which flow more down the pressure and density gradients, and have high Rossby numbers. The operational model analyses matched the observations quite well, giving confidence that these types of jets can be simulated and pre- dicted as long as the models have sufficient resolution and accurately parameterize vertical heat fluxes. N0001413WX20830 Office of Naval Research Global |
author2 |
Meteorology |
format |
Article in Journal/Newspaper |
author |
Guest, Peter Persson, P. Ola Wang, Shouping Jordan, Mary Jin, Yi Blomquist, Byron Fairall, Christopher |
spellingShingle |
Guest, Peter Persson, P. Ola Wang, Shouping Jordan, Mary Jin, Yi Blomquist, Byron Fairall, Christopher Low-Level Baroclinic Jets Over the New Arctic Ocean |
author_facet |
Guest, Peter Persson, P. Ola Wang, Shouping Jordan, Mary Jin, Yi Blomquist, Byron Fairall, Christopher |
author_sort |
Guest, Peter |
title |
Low-Level Baroclinic Jets Over the New Arctic Ocean |
title_short |
Low-Level Baroclinic Jets Over the New Arctic Ocean |
title_full |
Low-Level Baroclinic Jets Over the New Arctic Ocean |
title_fullStr |
Low-Level Baroclinic Jets Over the New Arctic Ocean |
title_full_unstemmed |
Low-Level Baroclinic Jets Over the New Arctic Ocean |
title_sort |
low-level baroclinic jets over the new arctic ocean |
publisher |
Wiley |
publishDate |
2018 |
url |
https://hdl.handle.net/10945/60236 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Beaufort Sea Chukchi |
genre_facet |
Arctic Arctic Arctic Ocean Beaufort Sea Chukchi |
op_relation |
Guest, Peter, et al. "Low‐Level Baroclinic Jets Over the New Arctic Ocean." Journal of Geophysical Research: Oceans (2018). DTIC Id124655 https://hdl.handle.net/10945/60236 |
_version_ |
1801371237339889664 |