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欧亚大陆夏季地表热力异常与同期中国东部夏季降水的可能联系

黄菱芳 陈海山 郑旭程 华文剑

黄菱芳, 陈海山, 郑旭程, 华文剑. 欧亚大陆夏季地表热力异常与同期中国东部夏季降水的可能联系[J]. 气候与环境研究, 2015, 20(6): 620-634. doi: 10.3878/j.issn.1006-9585.2015.15110
引用本文: 黄菱芳, 陈海山, 郑旭程, 华文剑. 欧亚大陆夏季地表热力异常与同期中国东部夏季降水的可能联系[J]. 气候与环境研究, 2015, 20(6): 620-634. doi: 10.3878/j.issn.1006-9585.2015.15110
HUANG Lingfang, CHEN Haishan, ZHENG Xucheng, HUA Wenjian. Summer Land Surface Thermal Anomalies over Eurasia and Their Relationship with Summer Rainfall in East China[J]. Climatic and Environmental Research, 2015, 20(6): 620-634. doi: 10.3878/j.issn.1006-9585.2015.15110
Citation: HUANG Lingfang, CHEN Haishan, ZHENG Xucheng, HUA Wenjian. Summer Land Surface Thermal Anomalies over Eurasia and Their Relationship with Summer Rainfall in East China[J]. Climatic and Environmental Research, 2015, 20(6): 620-634. doi: 10.3878/j.issn.1006-9585.2015.15110

欧亚大陆夏季地表热力异常与同期中国东部夏季降水的可能联系

doi: 10.3878/j.issn.1006-9585.2015.15110
基金项目: 国家自然科学基金41230422,公益性行业(气象)科研专项GYHY201406042

Summer Land Surface Thermal Anomalies over Eurasia and Their Relationship with Summer Rainfall in East China

  • 摘要: 利用ERA-40再分析资料、CRU TS3.0数据集以及中国站点观测数据,分析了欧亚大陆夏季地表热力异常的变化特征,在此基础上探讨了我国东部夏季降水与同期欧亚大陆地表热力异常之间的可能联系。研究发现,欧亚大陆地表气温与浅层土壤温度的大尺度变化特征基本一致:经验正交函数分解第一模态空间型表现为大陆西南部分区域与欧亚大陆其他区域反相变化,对应的时间系数均在20世纪80年代末出现转折。当夏季欧亚中纬度印度以北地区和我国中东部地区地表气温偏高时,东亚夏季风的强度偏强,西太平洋副热带高压位置偏东,我国东部偏南风偏强,江淮流域水汽偏少,且气流上升运动偏弱,降水偏少;华南和北方地区水汽偏多,且气流上升运动偏强,降水偏多;反之亦然。当欧亚大陆中高纬贝加尔湖以东及以西地区夏季地表气温偏高,而我国东北部地区夏季地表气温偏低时,东亚夏季风的强度偏强,西太平洋副热带高压位置偏西,我国东南部地区偏南风异常偏强,有利于水汽向江淮流域输送,东南沿海及内蒙古中部水汽偏少,且气流上升运动偏弱,降水偏少;而东部其余地区水汽偏多,且气流上升运动偏强,降水偏多;反之亦然。
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  • 收稿日期:  2015-05-07
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