Eddies and the annular modes of climate variability

被引:307
作者
Limpasuvan, V [1 ]
Hartmann, DL [1 ]
机构
[1] Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
关键词
D O I
10.1029/1999GL010478
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The dominant modes of month-to-month variation in the troposphere are realistically simulated in a general circulation model whose lower boundary is prescribed with realistic topography and seasonally varying, climatological sea surface temperatures. In both hemispheres, these internal modes describe a nearly zonally symmetric, North-South shifting of the zonal jets as anomalous westerlies vacillate between high (50 degrees-60 degrees) and low (30 degrees-40 degrees) latitudes. The eddy structures evolve with the jets, and the corresponding eddy momentum forcings support the shifts in jet position. Stationary (synoptic) wave variations mainly account for the total eddy forcings in the Northern (Southern) Hemisphere. Pronounced eddy variations occur over the North Atlantic sector.
引用
收藏
页码:3133 / 3136
页数:4
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