Mesoscale Cyclogenesis Dynamics Over the Southwestern
Previous work has shown that frequent mesoscale cyclogenesis adjacent to Franklin Island is linked to the strong and persistent katabatic winds from East Antarctica which funnel into Terra Nova Bay and then blow out over the southwestern Ross Sea. Four mesoscale cyclones that formed near Terra Nova...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.669.1487 2023-05-15T13:52:56+02:00 Mesoscale Cyclogenesis Dynamics Over the Southwestern Ross Sea Antarctica Jorge F. Carrasco Dawd H. Bromwich The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1487 http://polarmet.osu.edu/PMG_publications/carrasco_bromwich_jgr_1993.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1487 http://polarmet.osu.edu/PMG_publications/carrasco_bromwich_jgr_1993.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://polarmet.osu.edu/PMG_publications/carrasco_bromwich_jgr_1993.pdf text ftciteseerx 2016-01-08T17:14:29Z Previous work has shown that frequent mesoscale cyclogenesis adjacent to Franklin Island is linked to the strong and persistent katabatic winds from East Antarctica which funnel into Terra Nova Bay and then blow out over the southwestern Ross Sea. Four mesoscale cyclones that formed near Terra Nova Bay between February 16 and 20, 1988 are examined to more clearly define the governing mechanisms. These events are investigated using all available observations, including automatic weather station data, high-resolution satellite images, satellite soundings, and hemispheric synoptic analyses. The first two cyclones formed on low-level baroclinic zones established by the synoptic scale advection of warm moist air toward the cold continental air blowing gently from East Antarctica. In the second case, baroclinic instability of this small-scale cold front was apparently triggered by the enhanced upward vertical motion associated with the approach of a midtropospheric trough. The third mesocyclone formed shortly after on a baroclinic zone over the polar plateau; the second vortex completely disrupted the usual katabatic drainage over the plateau and forced warm moist air over the coastal slopes. All three cyclones moved to the north in the prevailing cyclonic flow, but the plateau vortex lasted for only 6 hours. The fourth mesoscale low formed in conjunction with an abrupt and intense surge of katabatic air from Terra Nova Bay which resharpened the coastal baroclinic zone. At the same time a transiting midtropospheric trough probably associated with lower tropospheric upward vertical motion apparently accelerated the katabatic winds and triggered the vortex formation. A similar katabatic wind-forced mesocyclone formed near Byrd Glacier. The two vortices moved to the east-southeast and northeast, respectively, apparently being steered by the generating katabatic airstreams, and merged just to the north of the Ross Ice Shelf. The combined vortex reintensified as another trough passed overhead and moved eastward to West ... Text Antarc* Antarctica Byrd Glacier East Antarctica Franklin Island Ice Shelf Ross Ice Shelf Ross Sea Unknown Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) East Antarctica Franklin Island ENVELOPE(168.317,168.317,-76.083,-76.083) Polar Plateau ENVELOPE(0.000,0.000,-90.000,-90.000) Ross Ice Shelf Ross Sea Terra Nova Bay |
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Open Polar |
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ftciteseerx |
language |
English |
description |
Previous work has shown that frequent mesoscale cyclogenesis adjacent to Franklin Island is linked to the strong and persistent katabatic winds from East Antarctica which funnel into Terra Nova Bay and then blow out over the southwestern Ross Sea. Four mesoscale cyclones that formed near Terra Nova Bay between February 16 and 20, 1988 are examined to more clearly define the governing mechanisms. These events are investigated using all available observations, including automatic weather station data, high-resolution satellite images, satellite soundings, and hemispheric synoptic analyses. The first two cyclones formed on low-level baroclinic zones established by the synoptic scale advection of warm moist air toward the cold continental air blowing gently from East Antarctica. In the second case, baroclinic instability of this small-scale cold front was apparently triggered by the enhanced upward vertical motion associated with the approach of a midtropospheric trough. The third mesocyclone formed shortly after on a baroclinic zone over the polar plateau; the second vortex completely disrupted the usual katabatic drainage over the plateau and forced warm moist air over the coastal slopes. All three cyclones moved to the north in the prevailing cyclonic flow, but the plateau vortex lasted for only 6 hours. The fourth mesoscale low formed in conjunction with an abrupt and intense surge of katabatic air from Terra Nova Bay which resharpened the coastal baroclinic zone. At the same time a transiting midtropospheric trough probably associated with lower tropospheric upward vertical motion apparently accelerated the katabatic winds and triggered the vortex formation. A similar katabatic wind-forced mesocyclone formed near Byrd Glacier. The two vortices moved to the east-southeast and northeast, respectively, apparently being steered by the generating katabatic airstreams, and merged just to the north of the Ross Ice Shelf. The combined vortex reintensified as another trough passed overhead and moved eastward to West ... |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ross Sea Antarctica Jorge F. Carrasco Dawd H. Bromwich |
spellingShingle |
Ross Sea Antarctica Jorge F. Carrasco Dawd H. Bromwich Mesoscale Cyclogenesis Dynamics Over the Southwestern |
author_facet |
Ross Sea Antarctica Jorge F. Carrasco Dawd H. Bromwich |
author_sort |
Ross Sea Antarctica |
title |
Mesoscale Cyclogenesis Dynamics Over the Southwestern |
title_short |
Mesoscale Cyclogenesis Dynamics Over the Southwestern |
title_full |
Mesoscale Cyclogenesis Dynamics Over the Southwestern |
title_fullStr |
Mesoscale Cyclogenesis Dynamics Over the Southwestern |
title_full_unstemmed |
Mesoscale Cyclogenesis Dynamics Over the Southwestern |
title_sort |
mesoscale cyclogenesis dynamics over the southwestern |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1487 http://polarmet.osu.edu/PMG_publications/carrasco_bromwich_jgr_1993.pdf |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) ENVELOPE(168.317,168.317,-76.083,-76.083) ENVELOPE(0.000,0.000,-90.000,-90.000) |
geographic |
Byrd Byrd Glacier East Antarctica Franklin Island Polar Plateau Ross Ice Shelf Ross Sea Terra Nova Bay |
geographic_facet |
Byrd Byrd Glacier East Antarctica Franklin Island Polar Plateau Ross Ice Shelf Ross Sea Terra Nova Bay |
genre |
Antarc* Antarctica Byrd Glacier East Antarctica Franklin Island Ice Shelf Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctica Byrd Glacier East Antarctica Franklin Island Ice Shelf Ross Ice Shelf Ross Sea |
op_source |
http://polarmet.osu.edu/PMG_publications/carrasco_bromwich_jgr_1993.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1487 http://polarmet.osu.edu/PMG_publications/carrasco_bromwich_jgr_1993.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766257819310358528 |