郭漪然, 田孟坤, 陈艳, 郭世昌. 秋季欧亚波列对我国秋季降水和表面气温的影响[J]. 云南大学学报(自然科学版), 2019, 41(4): 746-752. doi: 10.7540/j.ynu.20180451
引用本文: 郭漪然, 田孟坤, 陈艳, 郭世昌. 秋季欧亚波列对我国秋季降水和表面气温的影响[J]. 云南大学学报(自然科学版), 2019, 41(4): 746-752. doi: 10.7540/j.ynu.20180451
GUO Yi-ran, TIAN Meng-kun, CHEN Yan, GUO Shi-chang. Influence of autumn Eurasian wave train on precipitation and surface temperature of China[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(4): 746-752. DOI: 10.7540/j.ynu.20180451
Citation: GUO Yi-ran, TIAN Meng-kun, CHEN Yan, GUO Shi-chang. Influence of autumn Eurasian wave train on precipitation and surface temperature of China[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(4): 746-752. DOI: 10.7540/j.ynu.20180451

秋季欧亚波列对我国秋季降水和表面气温的影响

Influence of autumn Eurasian wave train on precipitation and surface temperature of China

  • 摘要: 从Kosaka的丝绸之路遥相关定义出发,计算了秋季欧亚波列指数,并对秋季欧亚波列与东亚大气环流以及中国秋季降水和温度的关系进行了研究. 诊断结果表明:秋季欧亚波列与中国东北秋季降水正相关,与华西秋雨负相关. 当秋季欧亚波列正位相时,位势高度场上40°~60°N的欧亚大陆上空存在一个自西向东的“− + −”异常波列,该波列在我国东北部形成一个异常低压气旋式环流,使得东北地区降水异常偏多;而华西地区由于显著的下沉气流,以及弱的反气旋式环流及水汽供应偏弱的影响,华西秋雨偏少. 另一方面,西北地区秋季欧亚波列指数与我国西北、四川北部及贵州表面气温负相关,可能是由于异常的西北气流引导冷空气南下引起的.

     

    Abstract: Based on the definition of Kosaka's Silk Road teleconnection, this paper calculates the index of the autumn Eurasian wave trains and studies the relationship between the autumn Eurasian wave train and East Asian atmospheric circulation, precipitation and temperature in autumn in China. The results show that the autumn Eurasian wave train is positively correlated with the autumn precipitation in Northeast China, and negatively correlated with the autumn rain in West China. The results also show that there is a " −+−” anomalous wave from west to east over the Eurasia continent of 40°—60°N in the geopotential height field when the autumn Eurasian wave train is in the positive phase in autumn. The wave train leads to an abnormally low−pressure cyclonic circulation in Northeast China, resulting in an abnormally great amount of precipitation in the region. In comparison, it rains little in West China in autumn, due to the significant downdraft flow, weak anti−cyclonic circulation and weak water supply. On the other hand, the index of the autumn Eurasian wave trains in Northwest China is negatively correlated with the surface temperature of Northwest China, North Sichuan and part of Guizhou Province, probably because the abnormally great northwesterly airflow leads the cold air southward.

     

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