期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 6, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL097234
关键词
Tibetan Plateau; El Nino-Southern Oscillation; surface wind speed dipole mode; negative sensible heating-baroclinic structure; surface westerly wind
资金
- National Natural Science Foundation of China [41730963, 42105062, 42175023, 41975080, 91937302]
- Guangdong Major Project of Basic and Applied Basic Research [2020B0301030004]
- Strategic Priority Research Program [XDB40030200]
Using observational analysis and numerical experiments, researchers have found that the dipole mode of spring surface wind speed over the Tibetan Plateau can trigger subsequent winter El Nino-Southern Oscillation events. This is achieved through the negative sensible heating-baroclinic structure over the western TP, which affects the westerly wind anomalies over the tropical western Pacific, favoring the occurrence of El Nino events.
Using observational analysis and numerical experiments, we identify that the dipole mode of spring surface wind speed (SWS) over the Tibetan Plateau (TP) could act as a trigger for subsequent winter El Nino-Southern Oscillation events. During the positive phase of spring SWS dipole mode (south-positive and north-negative), a self-sustaining negative sensible heating-baroclinic structure prevails over the western TP, which is characterized by negative surface sensible heating anomalies, anomalous low-level anticyclones, and mid-high-level cyclones. The negative sensible heating-baroclinic structure stimulates the surface westerly wind anomalies over the tropical western Pacific in May through two pathways, favoring the occurrence of subsequent El Nino events. One is through weakening the zonal monsoon circulation over the tropical Indian Ocean and the Walker circulation over the tropical western Pacific. The other is modulating the air-sea interaction over the North Pacific through triggering Rossby waves. The negative SWS dipole mode tends to induce La Nin & x303;a events.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据