An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates
In s coordinates, a variable f e(x, y, s, t) whose horizontal gradient 2=f e is equal to the irrotational part of the horizontal pressure gradient force is referred to as an equivalent isobaric geopotential height. Its inner part can be derived from the solution of a Poisson equation with zero Diric...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.670.7667 2023-05-15T16:29:51+02:00 An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates Qiu-shi Chen David H. Bromwich The Pennsylvania State University CiteSeerX Archives 1997 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.7667 http://polarmet.osu.edu/PMG_publications/chen_bromwich_mwr_1999.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.7667 http://polarmet.osu.edu/PMG_publications/chen_bromwich_mwr_1999.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://polarmet.osu.edu/PMG_publications/chen_bromwich_mwr_1999.pdf text 1997 ftciteseerx 2016-01-08T17:21:16Z In s coordinates, a variable f e(x, y, s, t) whose horizontal gradient 2=f e is equal to the irrotational part of the horizontal pressure gradient force is referred to as an equivalent isobaric geopotential height. Its inner part can be derived from the solution of a Poisson equation with zero Dirichlet boundary value. Because 2=f (x, y, p, t) is also the irrotational part of the horizontal pressure gradient force in p coordinates, the equivalent geopotential f e in s coordinates can be used in the same way as the geopotential f (x, y, p, t) used in p coordinates. In the sea level pressure (SLP) analysis over Greenland, small but strong high pressure systems often occur due to extrapolation. These artificial systems can be removed if the equivalent geopotential f e is used in synoptic analysis on a constant s surface, for example, at s 5 0.995 level. The geostrophic relation between the equivalent geopotential and streamfunction at s 5 0.995 is approximately satisfied. Because weather systems over the Tibetan Plateau are very difficult to track using routine SLP, 850-hPa, and 700-hPa analyses, equivalent isobaric geopotential analysis in s coordinates is especially useful over this area. An example of equivalent isobaric geopotential analysis at s 5 0.995 shows that a secondary high separated from a major anticyclone over the Tibetan Plateau when cold air affected the northeastern part of the plateau, but this secondary high is hardly resolved by the SLP analysis. The early stage of a low (or vortex), called a Text Greenland Unknown Greenland |
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English |
description |
In s coordinates, a variable f e(x, y, s, t) whose horizontal gradient 2=f e is equal to the irrotational part of the horizontal pressure gradient force is referred to as an equivalent isobaric geopotential height. Its inner part can be derived from the solution of a Poisson equation with zero Dirichlet boundary value. Because 2=f (x, y, p, t) is also the irrotational part of the horizontal pressure gradient force in p coordinates, the equivalent geopotential f e in s coordinates can be used in the same way as the geopotential f (x, y, p, t) used in p coordinates. In the sea level pressure (SLP) analysis over Greenland, small but strong high pressure systems often occur due to extrapolation. These artificial systems can be removed if the equivalent geopotential f e is used in synoptic analysis on a constant s surface, for example, at s 5 0.995 level. The geostrophic relation between the equivalent geopotential and streamfunction at s 5 0.995 is approximately satisfied. Because weather systems over the Tibetan Plateau are very difficult to track using routine SLP, 850-hPa, and 700-hPa analyses, equivalent isobaric geopotential analysis in s coordinates is especially useful over this area. An example of equivalent isobaric geopotential analysis at s 5 0.995 shows that a secondary high separated from a major anticyclone over the Tibetan Plateau when cold air affected the northeastern part of the plateau, but this secondary high is hardly resolved by the SLP analysis. The early stage of a low (or vortex), called a |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Qiu-shi Chen David H. Bromwich |
spellingShingle |
Qiu-shi Chen David H. Bromwich An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates |
author_facet |
Qiu-shi Chen David H. Bromwich |
author_sort |
Qiu-shi Chen |
title |
An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates |
title_short |
An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates |
title_full |
An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates |
title_fullStr |
An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates |
title_full_unstemmed |
An Equivalent Isobaric Geopotential Height and Its Application to Synoptic Analysis and a Generalized v Equation in s Coordinates |
title_sort |
equivalent isobaric geopotential height and its application to synoptic analysis and a generalized v equation in s coordinates |
publishDate |
1997 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.7667 http://polarmet.osu.edu/PMG_publications/chen_bromwich_mwr_1999.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
http://polarmet.osu.edu/PMG_publications/chen_bromwich_mwr_1999.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.7667 http://polarmet.osu.edu/PMG_publications/chen_bromwich_mwr_1999.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766019555815063552 |