DOI: 10.1002/grl.50841
论文题名: Wind-induced equatorial bulge in Venus and Titan general circulation models: Implication for the simulation of superrotation
作者: Tokano T.
刊名: Geophysical Research Letters
ISSN: 0094-8613
EISSN: 1944-8344
出版年: 2013
卷: 40, 期: 17 起始页码: 4538
结束页码: 4543
语种: 英语
英文关键词: meteorology
; Titan
; Venus
Scopus关键词: General circulation model
; Hydrostatic equations
; Hydrostatic primitive equations
; Identical conditions
; Pressure gradient force
; Titan
; Venus
; Vertical component
; Climate models
; Meteorology
; Hydraulics
; Coriolis force
; general circulation model
; geopotential
; gravity
; meteorology
; middle atmosphere
; pressure gradient
; Titan
; Venus
英文摘要: The centrifugal force associated with the superrotation in Venus' and Titan's middle atmosphere reduces the effective gravity and thereby modifies the shape of the geopotential surface, which manifests itself as an equatorial bulge. General circulation models (GCMs) based on the hydrostatic primitive equations cannot correctly represent this dynamics since the vertical component of the centrifugal force does not appear in the hydrostatic equation. Consequently, they are likely to underestimate the poleward pressure gradient force and superrotation in gradient wind balance. This effect can be accounted for in nonhydrostatic GCMs or in quasi-hydrostatic GCMs, in which the hydrostatic equation is supplemented by the vertical component of the centrifugal and Coriolis force and which do not make the shallow-atmosphere approximation. A quasi-hydrostatic GCM is shown to predict faster superrotation than a hydrostatic GCM run under otherwise identical conditions. Key Points Superrotation in Venus' and Titan's atmosphere causes an equatorial bulge Hydrostatic GCMs cannot represent it unless the equations are corrected Superrotation becomes stronger if this effect is taken into account in the GCM ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883450968&doi=10.1002%2fgrl.50841&partnerID=40&md5=2cb443a6acda39c1feb12f3409e79509
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5877
Appears in Collections: 气候减缓与适应
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作者单位: Institut für Geophysik und Meteorologie, Universität zu Köln, Cologne, Germany
Recommended Citation:
Tokano T.. Wind-induced equatorial bulge in Venus and Titan general circulation models: Implication for the simulation of superrotation[J]. Geophysical Research Letters,2013-01-01,40(17).