q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland
A series of idealized simulations of flow impinging on large mountains is conducted to investigate the impact of the mountain on the flow far downstream and to shed some light on the effects that Greenland may have on airflow over the North Atlantic. The upstream profiles of wind and stability are k...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.575.3245 2023-05-15T16:26:16+02:00 q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland Gu-du N Ni´na Petersen Haraldur O Lafsson The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.3245 http://folk.uio.no/jegill/papers/petersen_etal_2003_jas.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.3245 http://folk.uio.no/jegill/papers/petersen_etal_2003_jas.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://folk.uio.no/jegill/papers/petersen_etal_2003_jas.pdf text 2002 ftciteseerx 2016-01-08T12:43:31Z A series of idealized simulations of flow impinging on large mountains is conducted to investigate the impact of the mountain on the flow far downstream and to shed some light on the effects that Greenland may have on airflow over the North Atlantic. The upstream profiles of wind and stability are kept constant, there is no surface friction, the Rossby number is 0.4, and the nondimensional mountain height (hö 5 Nh/U) is varied from 1 to 6. The maximum sea level pressure deficit, the maximum geopotential height deficit, and the orographically gen-erated potential vorticity all increase with increased hö, showing no signs of abrupt change as the flow enters the regime of upstream blocking. The potential vorticity produced at the mountain is accumulated in vortices that are advected downstream. The vortices are associated with a larger pressure gradient to the south of the wake, giving rise to stronger westerlies at the surface as well as at upper levels. This process can explain how Greenland may affect cyclones moving far outside the mountain wake. An example from Fronts and Atlantic Storm Track Experiment (FASTEX) shows that a cyclone moving from the southwest toward Scotland becomes shallower and slower if the Greenland topography is removed. 1. Text Greenland North Atlantic Unknown Greenland |
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ftciteseerx |
language |
English |
description |
A series of idealized simulations of flow impinging on large mountains is conducted to investigate the impact of the mountain on the flow far downstream and to shed some light on the effects that Greenland may have on airflow over the North Atlantic. The upstream profiles of wind and stability are kept constant, there is no surface friction, the Rossby number is 0.4, and the nondimensional mountain height (hö 5 Nh/U) is varied from 1 to 6. The maximum sea level pressure deficit, the maximum geopotential height deficit, and the orographically gen-erated potential vorticity all increase with increased hö, showing no signs of abrupt change as the flow enters the regime of upstream blocking. The potential vorticity produced at the mountain is accumulated in vortices that are advected downstream. The vortices are associated with a larger pressure gradient to the south of the wake, giving rise to stronger westerlies at the surface as well as at upper levels. This process can explain how Greenland may affect cyclones moving far outside the mountain wake. An example from Fronts and Atlantic Storm Track Experiment (FASTEX) shows that a cyclone moving from the southwest toward Scotland becomes shallower and slower if the Greenland topography is removed. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Gu-du N Ni´na Petersen Haraldur O Lafsson |
spellingShingle |
Gu-du N Ni´na Petersen Haraldur O Lafsson q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland |
author_facet |
Gu-du N Ni´na Petersen Haraldur O Lafsson |
author_sort |
Gu-du N Ni´na Petersen |
title |
q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland |
title_short |
q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland |
title_full |
q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland |
title_fullStr |
q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland |
title_full_unstemmed |
q 2003 American Meteorological Society Flow in the Lee of Idealized Mountains and Greenland |
title_sort |
q 2003 american meteorological society flow in the lee of idealized mountains and greenland |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.3245 http://folk.uio.no/jegill/papers/petersen_etal_2003_jas.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
http://folk.uio.no/jegill/papers/petersen_etal_2003_jas.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.3245 http://folk.uio.no/jegill/papers/petersen_etal_2003_jas.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766015167097733120 |