陶云, 陈艳, 任菊章, 段长春. 1961—2014年云南冬季寒潮活动规律及其与大气环流异常的关系[J]. 云南大学学报(自然科学版), 2021, 43(1): 68-77. doi: 10.7540/j.ynu.20200094
引用本文: 陶云, 陈艳, 任菊章, 段长春. 1961—2014年云南冬季寒潮活动规律及其与大气环流异常的关系[J]. 云南大学学报(自然科学版), 2021, 43(1): 68-77. doi: 10.7540/j.ynu.20200094
TAO Yun, CHEN Yan, REN Ju-zhang, DUAN Chang-chun. Activity rules of the winter cold wave over Yunnan Province from 1961 to 2014 and their relationship with the atmospheric circulation[J]. Journal of Yunnan University: Natural Sciences Edition, 2021, 43(1): 68-77. DOI: 10.7540/j.ynu.20200094
Citation: TAO Yun, CHEN Yan, REN Ju-zhang, DUAN Chang-chun. Activity rules of the winter cold wave over Yunnan Province from 1961 to 2014 and their relationship with the atmospheric circulation[J]. Journal of Yunnan University: Natural Sciences Edition, 2021, 43(1): 68-77. DOI: 10.7540/j.ynu.20200094

1961—2014年云南冬季寒潮活动规律及其与大气环流异常的关系

Activity rules of the winter cold wave over Yunnan Province from 1961 to 2014 and their relationship with the atmospheric circulation

  • 摘要: 利用云南122个气象站1961—2015年逐日最低气温和平均气温资料,分析了云南冬季寒潮的活动规律以及大气环流异常特征. 结果表明:①1961—2014年(近50 a)云南冬季寒潮频次(强度)呈减少(减弱)趋势,1984年为寒潮频次(强度)由多(强)转少(弱)的一个转折点. 云南冬季寒潮存在8 a左右的显著性变化周期;②云南冬季寒潮与气温、降水存在较好的协同变化. 当冬季寒潮频次偏多(少)时,云南气温偏低(高),降水量偏多(少);③云南冬季寒潮频次年际变异与大气环流异常密切相关. 在海平面气压场,冬季北极涛动为正(负)位相、西伯利亚高压偏强(弱)以及东亚冬季风偏强(弱)时,云南冬季寒潮频次偏多(少). 在500 hPa高度场,当极涡偏强(弱)、贝加尔湖高压脊偏强(弱)、东亚大槽和南支槽偏强(弱)时,有利于云南冬季寒潮频次偏多(少);④副热带对流层上层的急流变化是影响云南寒潮频次变化的一个重要因子,其可能通过影响冷涌向南爆发的频次进而影响云南寒潮的发生频次.

     

    Abstract: Based on the daily minimum temperatures and mean temperatures of 122 meteorological observation stations in Yunnan from 1961 to 2015, the activity rules of the cold wave in Yunnan and the corresponding atmospheric circulation are analyzed. The results indicate that: ① The winter cold wave frequency (intensity) in Yunnan shows a decreasing (weakening) trend from 1961 to 2014. The turning point from more (strong) to less (weak) took place in 1984. Besides, the winter cold wave over Yunnan displays a significant change cycle of about every 8 years. ② There is a better concurrent variation between winter cold wave, temperature and precipitation in Yunnan. When the winter cold wave frequency is more (less) than normal, the temperature is lower (higher) than normal and the precipitation is above (below) normal. ③ The interannual variation of winter cold wave frequency in Yunnan is closely related to the atmospheric circulation. In the sea level pressure field in winter, the cold wave frequency in Yunnan is more (less) than normal, when the Arctic Oscillation (AO) is in its positive (negative) phase, the Siberian High is stronger (weaker) than normal and the East Asian winter monsoon is stronger (weaker) than normal. In the 500 hPa height field in winter, the cold wave frequency in Yunnan is more (less) than normal, when the polar vortex is stronger (weaker) than normal, the Baikal high ridge is stronger (weaker) than normal and the deep East Asian trough and the southern branch trough are stronger (weaker) than normal. ④ The change of subtropical jet stream in the upper troposphere is an important factor affecting the cold wave frequency change in Yunnan. The jet stream may impact on the cold wave frequency in Yunnan by affecting the frequency of cold surges bursting southward.

     

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