东亚季风强弱年高原、东亚及太平洋热力对比

The Thermal Contrast over the Tibetan Plateau、the East Asian and the Pacific Ocean in Strong and Weak East Asian Monsoon Years

为对东亚夏季风强弱年青藏高原、东亚及太平洋地区热力作用以及不同区域热力差进行对比研究,对进一步研究关键区热力差异对东亚季风的影响提供一些参考,采用相关分析,合成分析等统计方法。结果表明:东亚夏季风偏强时,孟加拉湾、华南、南海及热带西太平洋大气热源异常偏强,印度东部、青藏高原、中南半岛及中纬度西太平洋地区大气热源异常偏弱;且高原东部与东亚关键区热力差偏大,垂直方向上热力差在600 h Pa达到最大,东亚关键区与热带西太平洋热力差偏小,热力差在250 h Pa左右达到最大;高原东部与热带西太平洋热力差为负,热力差在400 h Pa达到最大。反之亦然。东亚夏季风强度变化对高原与热带西太平洋上空高层大气热源影响更大,对东亚关键区上空低层大气热源影响更大。

In order to analyze the thermal contrast over the Tibetan Plateau,the East Asian,the Pacific Ocean and the thermal differences over these areas in strong and weak East Asian summer monsoon（ EASM） years,the correlation analysis,synthetic analysis and other statistical methods are used in this paper. The results show that when the EASM is anomaly strong,the atmospheric heat sources over the bay of Bengal,the southern part of China,the south China sea and the tropical western pacific are exceptionally strong. The atmospheric heat sources over the eastern India,the Tibetan Plateau,the Indo-China Peninsula and the Mid-latitude western pacific are exceptionally weak; the thermal difference over the eastern Tibetan Plateau and the key region of the East Asian is anomaly big,and it reaches maximum at 600 h Pa in vertical direction; the thermal difference over the key region of the East Asian and the tropical western pacific is anomaly small,and it reaches maximum at 250 h Pa in vertical direction; the thermal difference over the eastern Tibetan Plateau and the tropical western pacific is negative,and reaches maximum at 400 h Pa in vertical direction. And vice versa. The change of the intensity of the EASM have more impact on the upper atmospheric heat source over the Tibetan plateau and the tropical western pacific,and the change of the intensity of the EASM have more impact on the lower atmospheric heat source over the key region of the East Asian.