| 新疆夏季高温日数的变化特征及其影响因子 |
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| 引用本文： | 陈颖,邵伟玲,曹萌,吕新生.新疆夏季高温日数的变化特征及其影响因子[J].干旱区研究,2020(1):58-66. |
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| 作者姓名： | 陈颖 邵伟玲 曹萌 吕新生 |
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| 作者单位： | 中国气象局乌鲁木齐沙漠气象研究所;新疆气候中心;新疆气象台 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项资金项目(IDM2019006)资助 |
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| 摘 要： | 根据1961-2018年新疆夏季高温日数的气候特征分析,新疆夏季高温日数的空间分布型可以分为全疆一致型、南北反相型和东西反相型。全疆一致型分布为新疆夏季高温日数的主要空间分布形态,在20世纪90年代中后期发生了一致增多的突变;南北反相型的分布在21世纪是多发的;21世纪以来,东西反相型多表现为偏西地区高温日数偏少、偏东地区高温日数偏多的分布特征。与3类分布型显著相关的环流场关键区域均位于中低纬度,当南亚高压偏强且南亚高压中心位置偏北时,夏季中低纬度尤其是30°~50°N位势高度明显升高,有利于新疆高温日数偏多。对于位于中纬度的新疆区域,从高度场的合成和温度平流的分析来看,厄尔尼诺事件不利于新疆夏季高温日数的偏多。
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| 关 键 词： | 高温 日数 夏季 厄尔尼诺 南亚高压 新疆 |
Variation of Summer High Temperature Days and Its Affecting Factors in Xinjiang |
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| Institution: | (Urumqi Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,Xinjiang,China;Xinjiang Climate Center,Urumqi 830002,Xinjiang,China;Xinjiang Meteorological Observatory,Urumqi 830002,Xinjiang,China) |
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| Abstract: | According to the characteristics of summer high temperature in Xinjiang during 1961-2018,its spatial distribution could be divided into the whole-Xinjiang distribution pattern,north-south distribution pattern and west-east distribution pattern. For the whole-Xinjiang distribution pattern,the summer high temperature days increased sharply in the mid-and late-1990’s. For the north-south distribution pattern,the interconversion of more summer high temperature days and less ones was frequent in the 21st century. For the west-east distribution pattern,the summer high temperature days were more in the east but less in the west since the 21st century. The key zones of the circulation field,significantly correlated with the spatial distribution patterns,were all located in middle and low latitudes. According to the circulation analysis of Xinjiang summer high temperature days,when the South Asian high was strong and its central area was located northwards,the potential height at the middle and low latitudes in summer increased significantly,especially over the 30°-50°N zones,leading to an increase of summer high temperature days in Xinjiang. Strong South Asia high made the height of the middle latitude increase. In summer,the potential height over the 30°-50°N zones increased significantly,which was conducive to the increase of summer high temperature days in Xinjiang. The El Nino event is actually not conducive to the increase of summer high temperature days in Xinjiang. |
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| Keywords: | high temperature days summer El Nino event the South Asia high Xinjiang |
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