| 中国冬季气温季节内变率特征及环流分析 |
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| 引用本文： | 申红艳,温婷婷,封国林,李红梅,乔少博,段丽君.中国冬季气温季节内变率特征及环流分析[J].气象,2021(3):327-336. |
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| 作者姓名： | 申红艳 温婷婷 封国林 李红梅 乔少博 段丽君 |
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| 作者单位： | 兰州大学大气科学院;青海省气候中心;国家气候中心;南方海洋科学与工程广东省实验室 |
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| 基金项目： | 国家自然科学基金项目(42065003,42075017和41875100);中国科学院寒旱区陆面过程与气候变化重点实验室开放基金(LPCC2019009);青海省科技厅基础研究(2021-ZJ-757)共同资助。 |
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| 摘 要： | 利用中国冬季逐日平均气温均方差作为气温季节内变率指标,分析其变化特征并探讨引起季节内变率异常的环流背景。结果表明,中国冬季气温季节内变率总体呈减弱趋势,对气候增暖趋势响应明显,其年代际变化和东亚冬季风年代际转折时间相吻合。当气温季节内变率异常偏强时,冬季平均环流场上呈类似准正压结构,平流层极涡偏弱,对流层中高纬呈类似斯堪的纳维亚遥相关型分布,低层西伯利亚高压偏强,北大西洋涛动(NAO)为负位相;NAO同我国东部气温变率联系密切,进一步分析揭示出NAO是通过影响西伯利亚高压的高频变化来作用于气温季节内变率。最后,通过提取天气—次季节—季节不同时间尺度上的大气环流内部变率,发现在各个尺度上,气温季节内变率均受西伯利亚高压和东亚冷涡的调控作用;尤其在天气尺度上,阿留申低压频繁波动及上游欧洲脊的稳定少动与气温变率有密切联系,季节尺度上欧亚阻塞高压和鄂霍次克海阻塞高压异常对气温变率有显著影响。
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| 关 键 词： | 均方差 季节内变率 北大西洋涛动 西伯利亚高压 尺度分离 |
Characteristics and Circulation Analysis of IntraseasonalVariability of Winter Temperature in China |
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| SHEN Hongyan,WEN Tingting,FENG Guolin,LI Hongmei,QIAO Shaobo,DUAN Lijun.Characteristics and Circulation Analysis of IntraseasonalVariability of Winter Temperature in China[J].Meteorological Monthly,2021(3):327-336. |
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| Authors: | SHEN Hongyan WEN Tingting FENG Guolin LI Hongmei QIAO Shaobo DUAN Lijun |
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| Institution: | (Department of Atmospheric and Sciences,Lanzhou University,Lanzhou 730000;Qinghai Climate Centre,Xining 810001;Laboratory of Climate Studies of CMA,National Climate Centre,Beijing 100081;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519082) |
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| Abstract: | The mean variance of daily air temperature over China in winter was used as the index of intra-seasonal variation of air temperature.Its characteristics was analyzed and its circulation background induced by intra seasoual variability of winter temperature in China was explored.The results show that the internal variability of winter temperature in China is generally weakening,and it has obvious response characteristics to the trend of climate warming.The interdecadal change coincides with the interdecadal transition time of the East Asian winter monsoon.When the temperature seasonal variability is abnormally strong,the average circulation field in winter shows a quasi-positive pressure structure,the polar vortex in the stratosphere is weak,the high latitudes in the troposphere distribute similarly to Scandinavian teleconnection type,the middle and low latitudes have a large area of negative anomaly,the near strata of Siberia is strong,and North Atlemtic Oscillation(NAO)is a negative phase.Further analysis shows that NAO can affect the intraseasonal variation of temperature by affecting the high frequency variation of Siberian high pressure.In the end,through extracting the internal variability of atmospheric circulation on four time scales of weather season,the seasonal variability of air temperature is regulated by Siberian high and East Asian cold vortex.In addition,on the synoptic scale,frequent fluctuations of the Aleutian low and stable deactivation of the upper European ridge are closely related to the temperature variability,and the seasonal scales,including Eurasian blocking high and Okhosk Sea blocking high anomalies,have significant effects on the temperature variability. |
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| Keywords: | mean variance intraseasonal variability North Atlantic Oscillation(NAO) Siberian high scale separation |
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