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DOI10.1175/JCLI-D-16-0450.1
An Analytical Framework for Understanding Tropical Meridional Modes
Martinez-Villalobos, Cristian; Vimont, Daniel J.
2017-05-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2017
卷号30期号:9
文章类型Article
语种英语
国家USA
英文摘要

A theoretical framework is developed for understanding the transient growth and propagation characteristics of thermodynamically coupled, meridional mode-like structures in the tropics. The model consists of a Gill-Matsuno-type steady atmosphere under the long-wave approximation coupled via a wind-evaporation-sea surface temperature (WES) feedback to a 'slab'' ocean model. When projected onto meridional basis functions for the atmosphere the system simplifies to a nonnormal set of equations that describes the evolution of individual sea surface temperature (SST) modes, with clean separation between equatorially symmetric and antisymmetric modes. The following major findings result from analysis of the system: 1) a transient growth process exists whereby specific SST modes propagate toward lower-order modes at the expense of the higher-order modes; 2) the same dynamical mechanisms govern the evolution of symmetric and antisymmetric SST modes except for the lowest-order wavenumber, where for symmetric structures the atmospheric Kelvin wave plays a critically different role in enhancing decay; and 3) the WES feedback is positive for all modes (with a maximum for the most equatorially confined antisymmetric structure) except for the most equatorially confined symmetric mode where the Kelvin wave generates a negative WES feedback. Taken together, these findings explain why equatorially antisymmetric "dipole''-like structures may dominate thermodynamically coupled ocean-atmosphere variability in the tropics. The role of nonnormality and the role of realistic mean states in meridional mode variability are discussed.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000399680500014
WOS关键词OCEAN-ATMOSPHERE MODEL ; COUPLED MODEL ; PACIFIC ; VARIABILITY ; ATLANTIC ; ENSO ; CIRCULATION ; TELECONNECTIONS ; PROPAGATION ; EQUATORIAL
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/19763
专题气候变化
作者单位Univ Wisconsin, Atmospher & Ocean Sci Dept, Madison, WI 53706 USA
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Martinez-Villalobos, Cristian,Vimont, Daniel J.. An Analytical Framework for Understanding Tropical Meridional Modes[J]. JOURNAL OF CLIMATE,2017,30(9).
APA Martinez-Villalobos, Cristian,&Vimont, Daniel J..(2017).An Analytical Framework for Understanding Tropical Meridional Modes.JOURNAL OF CLIMATE,30(9).
MLA Martinez-Villalobos, Cristian,et al."An Analytical Framework for Understanding Tropical Meridional Modes".JOURNAL OF CLIMATE 30.9(2017).
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