| 北疆冬季气温季节内变化及其环流特征 |
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| 引用本文： | 刘艳,郑育琳,陈颖.北疆冬季气温季节内变化及其环流特征[J].新疆气象,2020,14(3). |
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| 作者姓名： | 刘艳 郑育琳 陈颖 |
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| 作者单位： | 新疆气候中心,新疆气象台,新疆气候中心 |
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| 摘 要： | 基于新疆北部区域(简称北疆)37个代表气象站1961—2019年逐月平均气温资料和NCEP/NCAR再分析环流资料,通过经验正交函数(EOF)分解和相关分析方法,研究北疆近58 a冬季气温季节内变化的时空演变特征及其对应的大气环流特征。结果表明:(1)北疆前冬和后冬气温EOF分解的前两个模态在空间上均表现为全区一致变化型和偏西偏北地区与中东部反相变化型。前冬和后冬气温全区一致型的时间系数与同期500 hPa位势高度场呈显著负相关关系区域位于乌拉尔山附近,气温反相变化型的时间系数与同期500 hPa位势高度场呈显著正相关关系区域位于波罗的海附近。(2)北疆冬季气温季节内主要有前后距平一致和前后距平相反两种特征。在北疆冬季气温前后距平相反年份",前冷后暖"时的500 hPa乌拉尔山高压脊减弱消失,欧洲槽东移加深,东亚大槽强度减弱";前暖后冷"时,500 hPa欧洲槽减弱西退,乌拉尔山地区高度场抬升,东亚大槽加深。(3)前冬偏冷时,后冬偏暖的主要原因来自于500 hPa极涡增强,欧洲槽加深;前冬偏暖时,后冬偏冷的大部分原因是受500 hPa欧亚大陆大片的负变高区影响。
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| 关 键 词： | 北疆 冬季气温 前冬 后冬 大气环流 |
| 收稿时间： | 2019/5/10 0:00:00 |
| 修稿时间： | 2019/6/14 0:00:00 |
Analysis of Intraseasonal Variation of Winter Temperature and Its Atmospheric Circulation Characteristics in North Xinjiang |
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| LIU Yan,ZHENG Yu-lin and CHEN Ying.Analysis of Intraseasonal Variation of Winter Temperature and Its Atmospheric Circulation Characteristics in North Xinjiang[J].Bimonthly of Xinjiang Meteorology,2020,14(3). |
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| Authors: | LIU Yan ZHENG Yu-lin and CHEN Ying |
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| Institution: | Xinjiang Climate Center,Xinjiang Meteorological Observatory,Xinjiang Climate Center |
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| Abstract: | Based on the monthly mean air temperature data at 37 representative meteorological stations and the National Center for Environmental Prediction / National Center for Atmospheric Research (NCEP / NCAR) reanalysis circulation dataset during 1961-2018 in North Xinjiang, the spatial and temporal evolution characteristics of temperature changes in winter and corresponding atmospheric circulation characteristics in North Xinjiang over the past 58 years are analyzed by the empirical orthogonal function (EOF) decomposition method and correlation analysis method. The results are as follows: (1)The first two modes of EOF decomposition in the early and late winters of northern Xinjiang are characterized by uniform variation in the whole region and reverse variation in the west-to-north region and the Middle-East region; Correlation analysis shows that the first mode distribution of air temperature in early winter and late winter has the negative correlation with the 500hPa geopotential height near the ural mountains, and the second mode distribution of air temperature has the positive correlation with the 500hPa geopotential height near the Baltic sea. (2) There are two characteristics of winter temperature in North Xinjiang. One is an in-phase evolution of temperature from early to late winter, and the other is an out-of-phase evolution of temperature from early to late winter. When the early winter is cold and the late winter is warm, the European trough has moved eastward with the weakened high-pressure ridge of Ural Mountains and the weakened intensity of the East Asia deep trough. When the early winter is warm and the late winter is cold, the weakened European trough has retreated to the west with the elevation of height field in Ural mountains and the deepened intensity of East Asian deep trough. (3) The main reason for the cold early winter and warm late winter is the enhanced polar vortex and the deepened European trough, while the warm early winter and cold late winter is mainly due to the negative heightening area in Eurasia. |
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| Keywords: | North Xinjiang Winter temperature Early winter Late winter Atmospheric circulation |
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