doi:  10.3878/j.issn.1006-9895.1611.16198
盛夏青藏高原热源与菲律宾海对流活动的联系

Relationship between the Tibetan Plateau Heat Source and Convection over Philippine Sea
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基金:  国家自然科学基金
中文关键词:  青藏高原 热源 菲律宾海 对流 副热带高压
英文关键词:  The Tibetan Plateau, Heat source, Philippine Sea, Convection, Subtropical high,
     
作者中文名作者英文名单位
谢志昂Xie Zhiang中国科学院大气物理研究所
段安民Duan Anmin中国科学院大气物理研究所
引用:谢志昂,段安民.2017.盛夏青藏高原热源与菲律宾海对流活动的联系[J].大气科学
Citation:Xie Zhiang,Duan Anmin.2017.Relationship between the Tibetan Plateau Heat Source and Convection over Philippine Sea[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      通过多源资料诊断分析,本文讨论了盛夏(8月)青藏高原大气热源与菲律宾海对流活动之间的联系及可能的机制。结果表明,与青藏高原热源相联系的环流形势在夏季各月明显不同,因此对夏季青藏高原热源的影响应当分月讨论。在夏季各月中,菲律宾海对流活动与青藏高原热源在8月份的联系最为紧密,二者存在显著的反相关关系。而8月青藏高原热源、菲律宾对流活动、西太平洋副热带高压、印度季风低压、南亚高压、西风带槽脊和西北太平洋季风环流存在相互耦合的过程。青藏高原热源与菲律宾海对流活动之间联系的机制为:菲律宾海对流弱(强)年,西太副高偏西(东)偏南(北),西北太平洋季风环流减弱(加强),印度季风低压减弱(加强),西风带南压(北抬),又加之副高西侧有强(弱)的水汽输入,兼以高层南亚高压加强(减弱),使得高原南部降水显著增强(减弱),高原热源整体加强(减弱),高原热源的加强(减弱)又造成了高原南部到东亚区域低层西南(东北)风异常,又利于西太副高偏西(东)偏南(北),从而造成菲律宾海对流减弱(加强)。这一机制在高原热源强弱年均有表现,但强年表现得更为显著,并在个例中也有所体现,说明盛夏青藏高原热源异常和菲律宾海对流异常存在显著的相互作用。
Abstract:
      Based on the various datasets, the relationship and its relevant mechanism between the Tibetan Plateau heating (TPH) and convection over Philippine sea (CPS) in August are studied. It shows that monthly discussion of circulation patterns associated with TPH is required in summer due to great difference of atmospheric circulation patterns associating with the TPH in each months of summer. The result indicates the TPH in August shows a significant anti-relationship with CPS among three months. The coupling of circulation systems, including western North Pacific subtropical high (WNPSH), monsoon low over Indian, the South Asia High, westerlies and the western North Pacific monsoon, contributes to the anti-relationship between TPH and CPS in August. The procedure works as following: Due to strong (weak) CPS, accompanying with southwestward (northeastward) movement of the WNPSH, the monsoon circulation over western North Pacific and Indian are both reduced (enhanced), which leads to a strong (weak) flux on the western of the WNPSH and the equatorward (poleward) movement of westerlies. Then a strong South Asia High appears at upper level, as a result, the rainfall over south of Tibetan Plateau becomes above (below) the normal, which leads to strong TPH. After that, the southwesterly (northeasterly) anomalies caused by TPH anomalies emerge, which induce southwestward (northeastward) movement of WNPSH, contributing to strong (weak) CPS. Furthermore, the mechanism works in both strong TPH events, weak TPH events, but works better in strong TPH years, and it can be found in special case as well, indicating a strong interaction of TPH and CPS exists in August.
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