Impact of East Asian Summer Monsoon Heating on the Interannual Variation of the South Asian High
Impact of East Asian Summer Monsoon Heating on the Interannual Variation of the South Asian High
复制标题
东亚夏季风加热对南亚高压年际变化的影响
DOI：
10.1175/jcli-d-15-0118.1
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
何编
中科院分区：
文献类型：
--
作者：
张鹏飞;刘屹岷;何编
南亚高压（SAH）位于欧亚大陆副热带对流层上层，是东亚夏季风的调节者，对亚洲区域气候有着重要的影响。然而，有反馈的凝结加热与东亚夏季风降水到南亚高压的变化。本文对南亚高压强度的年际变化及其机制进行了研究。对于强SAH病例，高压系统增强并扩张。在中东和青藏高原东部，即南亚高压的西、东两侧，对流层上层温度和位势高度场存在显著的正异常。动力诊断和数值试验结果一致表明，青藏高原-长江流域东部地区南亚高压强度的年际变化受东亚夏季风降水的强烈影响。凝结加热异常对SAH的反馈作用也很明显。
AbstractOccupying the upper troposphere over subtropical Eurasia during boreal summer, the South Asian high (SAH) is thought to be a regulator of the East Asian summer monsoon (EASM), which is particularly important for regional climate over Asia. However, there is feedback of the condensational heating associated with EASM precipitation to SAH variability. In this study, interannual variation of SAH intensity and the mechanisms are investigated. For strong SAH cases, the high pressure system intensifies and expands. Significant positive anomalies of the geopotential height and upper-tropospheric temperature were found over the Middle East and to the east of the Tibetan Plateau (TP), namely, the western and the eastern flanks of the SAH. The dynamical diagnosis and the numerical experiments consistently show that the interannual variation of SAH intensity is strongly affected by EASM precipitation over the eastern TP–Yangtze River valley. The feedback of the condensational heating anomaly to the SAH is su...
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