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DOI | 10.1175/JAS-D-16-0047.1 |
Barotropic and Baroclinic Eddy Feedbacks in the Midlatitude Jet Variability and Responses to Climate Change-Like Thermal Forcings | |
Burrows, D. Alex1; Chen, Gang1,2; Sun, Lantao3,4 | |
2017 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Studies have suggested that the persistence in the meridional vacillation of the midlatitude jet (i.e., annular mode time scale) in comprehensive climate models is related to the model biases in climatological jet latitude, with important implications for projections of future climates and midlatitude weather events. Through the use of the recently developed finite-amplitude wave activity formalism and feedback quantifying techniques, this paper has quantified the role of barotropic and baroclinic eddy feedbacks in annular mode time scales using an idealized dry atmospheric model. The eddy-mean flow interaction that characterizes the persistent anomalous state of the midlatitude jet depends on processes associated with the lower-tropospheric source of vertically propagating Rossby waves, baroclinic mechanisms, and processes associated with upper-tropospheric wave propagation and breaking, barotropic mechanisms. A variety of climate change-like thermal forcings are used to generate a range of meridional shifts in the midlatitude eddy-driven jet. The idealized model shows a reduction in annular mode time scale associated with an increase in jet latitude, similar to comprehensive climate models. This decrease in time scale can be attributed to a similar decrease in the strength of the barotropic eddy feedback, which, in the positive phase of the annular mode, is characterized by anomalous potential vorticity (PV) mixing on the equatorward flank of the climatological jet. The decrease in subtropical PV mixing is, in turn, associated with a stronger subtropical jet as the eddy-driven jet is more distant from the subtropics. These results highlight the importance of subtropical eddy-mean flow interactions for the persistence of an eddy-driven jet. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000392419300007 |
WOS关键词 | ATMOSPHERIC GENERAL-CIRCULATION ; NORTH-ATLANTIC OSCILLATION ; STRATOSPHERIC POLAR VORTEX ; ZONAL-MEAN CIRCULATION ; SOUTHERN ANNULAR MODE ; FLUCTUATION-DISSIPATION ; EFFECTIVE DIFFUSIVITY ; 2-LAYER MODEL ; LIFE-CYCLES ; INDEX |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29759 |
专题 | 地球科学 |
作者单位 | 1.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA; 2.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA; 3.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; 4.NOAA, Earth Syst Res Lab, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Burrows, D. Alex,Chen, Gang,Sun, Lantao. Barotropic and Baroclinic Eddy Feedbacks in the Midlatitude Jet Variability and Responses to Climate Change-Like Thermal Forcings[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(1). |
APA | Burrows, D. Alex,Chen, Gang,&Sun, Lantao.(2017).Barotropic and Baroclinic Eddy Feedbacks in the Midlatitude Jet Variability and Responses to Climate Change-Like Thermal Forcings.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(1). |
MLA | Burrows, D. Alex,et al."Barotropic and Baroclinic Eddy Feedbacks in the Midlatitude Jet Variability and Responses to Climate Change-Like Thermal Forcings".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.1(2017). |
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