Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL088084 |
Downward migration of the zonal‐mean circulation in the tropical atmosphere | |
Kevin DallaSanta; Edwin P. Gerber | |
2020-09-09 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | The annular modes of the extratropical atmosphere have received much attention for quantifying variability of the jet streams and storm tracks, despite the fact that the midlatitude circulation itself does not vary uniformly with longitude. While tropical fluctuations in geopotential height have lower amplitude than in the extratropics, they exhibit stronger zonal coherence, or dynamical annularity. A simple index is developed to characterize zonal‐mean anomalies of the tropical circulation. It reveals that anomalies in geopotential height and zonal wind migrate downward from the upper troposphere to the surface on a time scale of about 10 days. These features are distinguishable from known modes of tropical variability, the Madden‐‐Julian Oscillation in particular. Evidence from reanalysis and idealized model experiments confirms that this downward migration is quite generic and driven by mechanically forced variations in the strength of the Hadley circulation on subseasonal time scales. |
领域 | 气候变化 |
URL | 查看原文 |
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/293968 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Kevin DallaSanta,Edwin P. Gerber. Downward migration of the zonal‐mean circulation in the tropical atmosphere[J]. Geophysical Research Letters,2020. |
APA | Kevin DallaSanta,&Edwin P. Gerber.(2020).Downward migration of the zonal‐mean circulation in the tropical atmosphere.Geophysical Research Letters. |
MLA | Kevin DallaSanta,et al."Downward migration of the zonal‐mean circulation in the tropical atmosphere".Geophysical Research Letters (2020). |
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