globalchange  > 气候变化事实与影响
DOI: 10.1175/JAS-D-18-0086.1
WOS记录号: WOS:000463798400001
论文题名:
The Eddy-Driven Jet and Storm-Track Responses to Boundary Layer Drag: Insights from an Idealized Dry GCM Study
作者: Mbengue, Cheikh O.; Woollings, Tim
通讯作者: Mbengue, Cheikh O.
刊名: JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN: 0022-4928
EISSN: 1520-0469
出版年: 2019
卷: 76, 期:4, 页码:1055-1076
语种: 英语
英文关键词: Extratropics ; Subtropics ; Jets ; Storm tracks ; Friction ; General circulation models
WOS关键词: ROSSBY-WAVE PROPAGATION ; GENERAL-CIRCULATION ; CLIMATE-CHANGE ; HADLEY CIRCULATION ; VARIABILITY ; SENSITIVITY ; ATMOSPHERE ; LATITUDE ; SCHEME ; ENERGY
WOS学科分类: Meteorology & Atmospheric Sciences
WOS研究方向: Meteorology & Atmospheric Sciences
英文摘要:

Simulations using a dry, idealized general circulation model (GCM) are conducted to systematically investigate the eddy-driven jet's sensitivity to the location of boundary layer drag. Perturbations of boundary layer drag solely within the baroclinic zone reproduce the eddy-driven jet responses to global drag variations. The implications for current theories of eddy-driven jet shifts are discussed. Hemispherically asymmetric drag simulations in equinoctial and solstitial thermal conditions show that perturbations of surface drag in one hemisphere have negligible effects on the strength and latitude of the eddy-driven jet in the opposite hemisphere. Jet speed exhibits larger sensitivities to surface drag in perpetual winter simulations, while sensitivities in jet latitude are larger in perpetual summer simulations. Near-surface drag simulations with an Earthlike continental profile show how surface drag may facilitate tropical-extratropical teleconnections by modifying waveguides through changes in jet latitude. Longitudinally confined drag simulations demonstrate a novel mechanism for localizing storm tracks. A theoretical analysis is used to show that asymmetries in the Bernoulli function within the baroclinic zone are important for the eddy-driven jet latitude responses because they directly modulate the sensitivity of the zonal-mean zonal wind to drag in the boundary layer momentum balance. The simulations contained herein provide a rich array of case studies against which to test current theories of eddy-driven jet and storm-track shifts, and the results affirm the importance of correct, well-constrained locations and intensities of boundary layer drag in order to reduce jet and storm-track biases in climate and forecast models.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/132719
Appears in Collections:气候变化事实与影响

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作者单位: Univ Oxford, Oxford, England

Recommended Citation:
Mbengue, Cheikh O.,Woollings, Tim. The Eddy-Driven Jet and Storm-Track Responses to Boundary Layer Drag: Insights from an Idealized Dry GCM Study[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019-01-01,76(4):1055-1076
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