Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around
The high topography of Greenland results in a number of orographically induced high wind speed flows along its coast that are of interest from both a severe weather and climate perspective. Here the surface wind field dataset from the NASA–JPL SeaWinds scatterometer on board the Quick Scatterometer...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.530.9181 2023-05-15T15:51:50+02:00 Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around G. W. K. Moore I. A. Renfrew The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.9181 http://www.uea.ac.uk/~e046/research/gfdex/publications/papers/tipjet_barrierwinds_qscat_reprint2005.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.9181 http://www.uea.ac.uk/~e046/research/gfdex/publications/papers/tipjet_barrierwinds_qscat_reprint2005.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.uea.ac.uk/~e046/research/gfdex/publications/papers/tipjet_barrierwinds_qscat_reprint2005.pdf text 2005 ftciteseerx 2016-01-08T10:36:21Z The high topography of Greenland results in a number of orographically induced high wind speed flows along its coast that are of interest from both a severe weather and climate perspective. Here the surface wind field dataset from the NASA–JPL SeaWinds scatterometer on board the Quick Scatterometer (Quik-SCAT) satellite is used to develop a wintertime climatology of these flows. The high spatial resolution and the twice-daily sampling of the SeaWinds instrument allows for a much more detailed view of the surface winds around Greenland than has been previously possible. Three phenomena stand out as the most distinctive features of the surface wind field during the winter months: the previously identified tip jets and reverse tip jets, as well as the hitherto unrecognized barrier flows along its southeast coast in the vicinity of the Denmark Strait. Peak surface wind speeds associated with these phenomena can be as large as 50 m s1 with winds over 25 m s1 occurring approximately 10%–15 % of the time at each location. A compositing technique is used to show that each type of flow is the result of an interaction between a synoptic-scale parent cyclone and the high topography of Greenland. In keeping with previous work, it is argued that tip jets are caused by a combination of conservation of the Bernoulli function during orographic descent and acceleration due to flow splitting as stable air passes around Cape Farewell, while barrier winds are a geostrophic response to stable air being forced against high topography. It is proposed that reverse tip jets occur when barrier winds reach the end of the topographic barrier and move from a geostrophic to a gradient wind balance, becoming supergeostrophic as a result of their anticyclonic curvature. 1. Text Cape Farewell Denmark Strait Greenland Unknown Greenland |
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Open Polar |
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ftciteseerx |
language |
English |
description |
The high topography of Greenland results in a number of orographically induced high wind speed flows along its coast that are of interest from both a severe weather and climate perspective. Here the surface wind field dataset from the NASA–JPL SeaWinds scatterometer on board the Quick Scatterometer (Quik-SCAT) satellite is used to develop a wintertime climatology of these flows. The high spatial resolution and the twice-daily sampling of the SeaWinds instrument allows for a much more detailed view of the surface winds around Greenland than has been previously possible. Three phenomena stand out as the most distinctive features of the surface wind field during the winter months: the previously identified tip jets and reverse tip jets, as well as the hitherto unrecognized barrier flows along its southeast coast in the vicinity of the Denmark Strait. Peak surface wind speeds associated with these phenomena can be as large as 50 m s1 with winds over 25 m s1 occurring approximately 10%–15 % of the time at each location. A compositing technique is used to show that each type of flow is the result of an interaction between a synoptic-scale parent cyclone and the high topography of Greenland. In keeping with previous work, it is argued that tip jets are caused by a combination of conservation of the Bernoulli function during orographic descent and acceleration due to flow splitting as stable air passes around Cape Farewell, while barrier winds are a geostrophic response to stable air being forced against high topography. It is proposed that reverse tip jets occur when barrier winds reach the end of the topographic barrier and move from a geostrophic to a gradient wind balance, becoming supergeostrophic as a result of their anticyclonic curvature. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
G. W. K. Moore I. A. Renfrew |
spellingShingle |
G. W. K. Moore I. A. Renfrew Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around |
author_facet |
G. W. K. Moore I. A. Renfrew |
author_sort |
G. W. K. Moore |
title |
Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around |
title_short |
Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around |
title_full |
Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around |
title_fullStr |
Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around |
title_full_unstemmed |
Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around |
title_sort |
tip jets and barrier winds: a quikscat climatology of high wind speed events around |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.9181 http://www.uea.ac.uk/~e046/research/gfdex/publications/papers/tipjet_barrierwinds_qscat_reprint2005.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Cape Farewell Denmark Strait Greenland |
genre_facet |
Cape Farewell Denmark Strait Greenland |
op_source |
http://www.uea.ac.uk/~e046/research/gfdex/publications/papers/tipjet_barrierwinds_qscat_reprint2005.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.9181 http://www.uea.ac.uk/~e046/research/gfdex/publications/papers/tipjet_barrierwinds_qscat_reprint2005.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766387213094879232 |