On the Linkage Between the Asian Summer Monsoon and Tropopause Folds
On the Linkage Between the Asian Summer Monsoon and Tropopause Folds
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DOI：
10.1002/2017jd027870
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Yutian Wu;Gang Chen;L. Taylor;Pengfei Zhang
中科院分区：
文献类型：
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作者：
Yutian Wu;Gang Chen;L. Taylor;Pengfei Zhang
本研究使用一组理想化的水行星模型实验来研究亚洲夏季风环流与对流层顶褶皱活动之间的联系。研究发现，褶皱倾向于发生在与季风环流相关的高层反气旋西北侧，是由于季风环流增强导致沉降加剧而产生的。此外，对流层顶褶皱对极端降水事件的影响也进行了研究。据发现，虽然极端降雨的可能性大大降低，在上游的褶皱的发生，可能性显着增加下游。这种抑制上游极端降雨和促进下游的模式也持续了大约1-2天，这可能表明下游极端降雨和对流层顶褶皱之间存在正反馈。最后还讨论了对流层顶褶皱随季风强度的变化。
This study uses a set of idealized aquaplanet model experiments to investigate the linkage between the Asian summer monsoon circulation and tropopause fold activity. It is found that folds tend to occur on the northwestern side of the upper‐level anticyclone associated with the monsoon circulation and are generated due to intensified monsoon circulation and resulting intensified subsidence. In addition, the impact of tropopause folds on extreme rainfall events is also examined. It is found that while the likelihood of extreme rainfall is largely decreased at and upstream of the occurrence of folds, the likelihood is significantly increased downstream. This pattern of suppression of extreme rainfall upstream and promotion downstream also persists for about 1–2 days, which likely suggests a positive feedback between extreme rainfall downstream and tropopause folds. Finally, changes in tropopause folds with monsoon intensity are also discussed.