Processes for Occurrence of Strong Cold Events over Eastern China
Processes for Occurrence of Strong Cold Events over Eastern China
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DOI：
10.1175/jcli-d-16-0857.1
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发表时间：
2017-04
影响因子：
4.9
通讯作者：
Lei Song;R. Wu
中科院分区：
文献类型：
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作者：
Lei Song;R. Wu
摘要2016年1月24日前后，我国东部地区遭遇一次强冷空气过程，40°N以南的大部分地区地面气温较气候平均值偏低10°C以上。在1979/80年至2015/16年的冬季，中国东部地区共发现了37次类似于2016年1月的强冷事件，其温度异常超过-5 °C。对40°N以北具有相同强度地面温度异常的事件进行对比分析，结果表明：40°N以南冷空气南侵中国东部与两个因素有关。一个是高层波列、地面西伯利亚高压和中高纬度欧亚大陆上空对流层中层东亚大槽的纬向位置。另一个是来自中纬度北大西洋的副热带上层波列。副热带波列的出现与北大西洋涛动（NAO）的正位相有关。什...
AbstractA strong cold event hit eastern China around 24 January 2016 with surface air temperature reaching more than 10°C below the climatological mean in most regions of eastern China south of 40°N. A total of 37 strong cold events similar to the January 2016 event with temperature anomalies over eastern China exceeding −5°C have been identified during the winters from 1979/80 to 2015/16. A comparative analysis of events with surface temperature anomalies of the same intensity but limited to north of 40°N indicates that the southward invasion of cold air to eastern China south of 40°N is related to two factors. One is the latitudinal location of the upper-level wave train, the surface Siberian high, and the midtropospheric East Asian trough over the mid- to high-latitude Eurasian continent. The other is a subtropical upper-level wave train emanating from the midlatitude North Atlantic. The emergence of the subtropical wave train is related to the positive phase of the North Atlantic Oscillation (NAO). Wh...