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春季亚洲中东部地表感热通量的变化特征及其与中国夏季降水的关系
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国家科技支撑项目2007BAC29B03,国家自然科学基金项目40830103、40821092


The Distribution of Surface Sensible Heat Flux in Spring over Central and Eastern Asia and Its Relationship with Summer Precipitation in China
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    摘要:

    采用1951~2000年NCEP/NCAR再分析资料中的逐月感热通量资料,分析了亚洲中东部春季近50年地表感热通量的气候分布特征,结果表明:亚洲中东部春季地表感热通量的高值区位于华北、西北和印度地区;低值区主要位于东北、江南和蒙古国北部;青藏高原、中国东部30°N附近地区和印度中部地区是感热通量年际变幅最大的区域。运用旋转经验正交展开(REOF)方法分析了亚洲中东部地区地表感热的时空演变特征及其与中国主要区域夏季降水的关系,结果表明:中国东部30°N附近地区的春季感热与黄淮地区的夏季降水为负相关,而夏季长江中下游流域降水与青藏高原春季感热和印度中部地区春季感热异常则为较显著的正相关。运用非绝热加热理论和合成分析,进一步分析了与春季地表感热通量异常相对应的同期和后期大气环流场的异常,结果表明:对应于中国东部30°N附近地区春季的感热通量异常,中国东南部和西南部地区存在着显著的环流场异常,伴随着春季江南地区西南风强度的改变,进而引起东亚夏季风强度及我国夏季降水的异常;印度中部地区春季地表感热通量的异常则会影响到后期印度夏季风的强弱,进而通过印度季风和东亚夏季风环流的遥相关关系,导致东亚夏季风强度变化,进而影响到中国夏季降水的异常。

    Abstract:

    Using the NCEP/NCAR reanalysis Surface Sensible Heat Flux (SSHF) dataset during 1951-2000, the general features of SSHF distribution over central and eastern Asia are analyzed. It is found that there are three areas with higher values of SSHF in North China, Northwest China, and India, whereas the areas with lower SSHF values are located in Northeast China and South China, and strong interannual variability of SSHF can be found around 30°N over eastern China, Tibetan Plateau region, and India. The spatial and temporal distribution of SSHF over central and eastern Asia has been further investigated based on the REOF(Rotated Empirical Orthogonal Function) method and the relationship between spring SSHF and summer precipitation over China has also been examined. The significant correlations can be found between summer precipitation anomalies over Yellow River and Huaihe River basin and SSHF anomalies over about 30°N in eastern part of China, while the summer precipitation anomalies in the Yangtze River are closely correlated with the SSHF anomalies over the Tibetan Plateau and India region. Further analysis shows that, the anomalies of spring SSHF over about 30°N in eastern part of China are accompanied by atmospheric circulation anomalies in southeastern and southwestern China, which can result in the anomalies of southwest wind intensity, and the summer precipitation anomalies. The anomalies of SSHF in India are associated with the anomalies of Indian summer monsoon, which can affect the East Asian summer circulation and precipitation in China through teleconnection mechanism.

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王林,刘鹏,林朝晖,秦正坤.2011.春季亚洲中东部地表感热通量的变化特征及其与中国夏季降水的关系[J].气候与环境研究,16(3):310-321. WANG Lin, LIU Peng, LIN Zhaohui, QIN Zhengkun.2011. The Distribution of Surface Sensible Heat Flux in Spring over Central and Eastern Asia and Its Relationship with Summer Precipitation in China[J]. Climatic and Environmental Research (in Chinese],16(3):310-321.

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  • 在线发布日期: 2011-12-01
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