热带偏东急流的垂直变率结构及其相关因子

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric and Oceanic Science Letters Pub Date : 2023-09-01 DOI:10.1016/j.aosl.2023.100400
Ye Yao , Yuanyuan Guo , Zhiping Wen , Sihua Huang
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引用次数: 0

摘要

热带偏东急流(TEJ)是一种在北半球夏季从对流层上层向平流层下层发生的偏东急流。由于其垂直延伸范围从300至70 hPa, TEJ可能在不同的高度表现出不同的特征,其细节迄今尚不清楚。本研究采用两种经验正交函数(EOF)模式,研究了TEJ垂直结构的年际变化。主导EOF模态在垂直方向上表现为TEJ主体的持续增强或减弱,在年际和年代际时间尺度上均有变化。ENSO可以在年际间调制这种垂直一致模态,而大西洋多年代际涛动和太平洋年代际涛动可以影响其年代际变率。而第二次EOF模态在对流层高层和平流层低层纬向风异常之间表现出非相位关系,与TEJ垂直运动的变化有关,在准两年一度的时间尺度上占主导地位。准双年振荡可以通过直接改变对流层顶风和间接诱导热带印度洋和海洋大陆上空的异常对流来促进TEJ垂直运动的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Vertical structure of variabilities in the tropical easterly jet and associated factors

The tropical easterly jet (TEJ) is an easterly jet stream that occurs from the upper troposphere to lower stratosphere in boreal summer. Owing to its wide vertical extension from 300 to 70 hPa, the TEJ may exhibit distinct characteristics at different levels, the details of which remain thus far unclear. In this study, two empirical orthogonal function (EOF) modes of the year-to-year variability in the vertical structure of the TEJ were investigated. The leading EOF mode represents a consistent strengthening or weakening of the TEJ's main body in the vertical direction and varies on both interannual and interdecadal time scales. It has been suggested that ENSO can modulate this vertically consistent mode interannually, whereas the Atlantic Multidecadal Oscillation and Pacific Decadal Oscillation can influence its interdecadal variability. In contrast, the second EOF mode exhibits an out-of-phase relationship between the zonal wind anomalies of the upper troposphere and lower stratosphere, linked with the changes in the TEJ's vertical movement and dominating on the quasi-biennial time scale. The Quasi-Biennial Oscillation could contribute to variations in the TEJ's vertical movement by changing the tropopause winds as a direct pathway and inducing anomalous convection over the tropical Indian Ocean and Maritime Continent as an indirect pathway.

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来源期刊
Atmospheric and Oceanic Science Letters
Atmospheric and Oceanic Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.20
自引率
8.70%
发文量
925
审稿时长
12 weeks
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