夏季北大西洋三极型海温异常与我国西南地区气温年际变化的联系
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1.南京信息工程大学;2.重庆市气候中心

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国家自然科学基金资助项目(41575102);中国气象局气候模式发展专项(YBSZMSXM(2020)-04)


夏季北大西洋三极型海温异常与我国西南地区气温年际变化的联系
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1.Nanjing University of Information Science & Technology;2.Chongqing Climate Center

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    摘要:

    利用1951—2016年Hadley中心的海温资料、NCEP/NCAR再分析资料和全国160站气温资料,研究了夏季北大西洋三极型海温异常与我国气温年际变化的联系及可能机制。结果表明,夏季北大西洋三极型海温异常与同期我国西南地区气温年际变化为显著的负相关关系。夏季北大西洋海温“- + -”三极型异常激发的北半球中高纬欧亚遥相关波列引起贝加尔湖地区位势高度升高,产生反气旋性环流异常;东亚地区位势高度降低,产生气旋性环流异常。西南地区在对流层中下层位于贝加尔湖异常反气旋性环流的东部和东亚异常气旋性环流的西部,在两者的共同作用下,受异常偏北气流的影响,有利于冷空气南下和堆积。与此同时,对流层高层的东亚副热带西风急流位置偏南,西南地区位于急流南侧的异常上升气流中,此种环流形势配置导致我国西南地区气温降低;反之亦然。

    Abstract:

    Based on the data from the monthly Sea Surface Temperature(SST) data of Hadley Center, NCEP/NCAR reanalysis data and the observed temperature data of 160 stations in China during 1951—2016, the association and possible mechanism between the North Atlantic SST tripole in summer and interannual temperature variability in China are investigated. The summer North Atlantic SST tripolar anomaly is significantly negatively correlated with the interannual temperature variability in the Southwest of China during the same period. The summer North Atlantic SST "-+ -" tripolar anomaly stimulates the northern hemisphere mid-high latitude Eurasian teleconnection wave train, which causes the potential height of the Baikal region to increase, resulting in an anticyclonic circulation anomaly; the East Asia region to decreased, resulting in a cyclonic circulation anomaly. The Southwest region of China in the middle and lower troposphere is located in the East of the Baikal anticyclonic circulation and the West of the East Asian cyclonic circulation. Under the joint action of the two, it is affected by the anomalous northerly airflow, which is conducive to the southward and accumulation of cold air. In the same time, the East Asian subtropical westerly jet in the upper troposphere is southward and the Southwest region of China is located in the anomalous updraft on the south side of the jet stream, this configuration will cause the temperature in the area to decrease; vice versa.

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  • 收稿日期:2020-05-08
  • 最后修改日期:2020-07-06
  • 录用日期:2020-11-20
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