任曼琳,张文君. 2020. ENSO对我国冬季天气尺度气温变率的影响及可能机理[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.021
ENSO对我国冬季天气尺度气温变率的影响及可能机理
ENSO’s impact on the winter synoptic-scale air temperature variability over China and its possible mechanism
投稿时间:2019-05-06  修订日期:2019-10-10
DOI:10.11676/qxxb2020.021
中文关键词:  ENSO, 气温变率,天气尺度,西伯利亚风暴轴
英文关键词:ENSO, Air temperature variability, Synoptic-scale, Siberian storm track
基金项目:国家自然科学基金,国家重点基础研究发展计划,全球变化与海气相互作用专项,南京信息工程大学人才启动基金资助
作者单位E-mail
任曼琳 南京信息工程大学 407232850@qq.com 
张文君 南京信息工程大学 zhangwj@nuist.edu.cn 
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中文摘要:
      基于1960-2017年国家气象信息中心整编的753站逐日平均温度资料、美国国家海洋大气中心(NOAA)重建的逐月海表温度资料以及美国国家环境预测中心/国家大气研究中心(NCEP/NCAR)提供的再分析大气环流资料,分析了ENSO对我国冬季天气尺度气温变率的影响。结果表明,ENSO与我国东部大部分地区的冬季天气尺度气温变率呈显著正相关,即El Ni?o年冬季,我国气温波动程度增大,天气尺度气温变率明显偏强;而La Ni?a年冬季,气温变化相对平稳,天气尺度温度变率偏弱。进一步研究发现,El Ni?o事件加强了冬季欧亚大陆中高纬的经向温度梯度,根据热成风原理,局地大气斜压性得到增强,西伯利亚地区的风暴活动和下游东亚地区大气环流的天气尺度变异也随之加强,因而有利于我国大部分地区天气尺度温度变率的增强。La Ni?a年冬季,异常情况与之大致相反。这一研究结果对我国高频天气变率的短期气候预测提供了新的参考依据。
英文摘要:
      The present study investigates the ENSO’s impact on the winter synoptic-scale air temperature variability over China, based on the daily averaged air temperature data of 753 stations compiled by the National Meteorological Information Center, the NOAA reconstructed monthly sea surface temperature and the NCEP/NCAR reanalysis datasets from 1960 to 2017. The results show that ENSO has a significantly positive correlation with the winter synoptic-scale air temperature variability in a large area of eastern China. The fluctuation of temperature and the synoptic-scale air temperature variability is usually stronger than normal during El Ni?o winters. In contrast, the synoptic-scale air temperature variability is weakened during La Ni?a winters. Further research found, during the El Ni?o winters, the meridional temperature gradient in the middle and high latitudes of Eurasia is strengthened, leads to the enhanced local atmospheric baroclinicity according to the thermal wind relationship thus further increase the storm activity in the Siberian region and the synoptic-scale variation of the atmospheric circulation in the East Asia region. Correspondingly, the synoptic-scale air temperature variability is enhanced in most of China. Roughly opposite mechanisms also apply during the La Ni?a winters. Our results provide new reference for seasonal predictions of high-frequency weather variability in China.
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