| 曹萌,刘精,陈颖.2023年夏季新疆的阶段性高温及环流演变[J].沙漠与绿洲气象,2024,18(5):113~119 |
| 2023年夏季新疆的阶段性高温及环流演变 |
| Stage Characteristics and Circulation Evolution of the High Temperature in the Summer of 2023 in Xinjiang |
| 投稿时间：2024-02-07 修订日期：2024-04-20 |
| DOI： |
| 中文关键词: 高温 阶段性变化 南亚高压 伊朗副高 西太平洋副热带高压 |
| 英文关键词:High temperature Stage change South Asian High Iranian Subtropical High Western Pacific Subtropical High |
| 基金项目:中国气象局复盘总结专项(FPZJ2023-153) |
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| 中文摘要: |
| 2023年夏季(6-8月)新疆平均气温偏高幅度居1961年以来第一位,高温日数居历史同期第一位,高温过程持续时间居历史同期第一位,高温覆盖面积最广。本文利用新疆105个国家级气象站监测资料,分析2023年夏季高温日数、最高气温、高温过程时长和高温过程覆盖范围等极端性特征的季节内演变,季节内各月高温特征总体呈现发展-强盛-消减的趋势,并运用NCEP/NCAR联合制作的位势高度场再分析资料对2023年夏季100hPa、500hPa层面高空环流的阶段性变化对比研究得出,新疆极端高温的季节内变化与南压高压和伊朗副高的强度、面积、位置的阶段性变化密切相关,当南压高压偏东偏北,强度偏强,伊朗副高增强,北移东进,青藏高原高压脊发展强盛,配合西太副高位置东伸,有利于新疆产生持续性极端高温天气过程。当南压高压为青藏高原型,伊朗副高主体位置偏西,有利于冷空气从北方进入新疆,造成阶段性降温天气,新疆极端高温过程减弱,持续时间缩短。 |
| 英文摘要: |
| In summer of 2023 (June-August), the average temperature in Xinjiang was the highest since 1961, the number of high temperature days was the highest in the same period of history, the duration of high temperature process was the highest in the same period of history, and the high temperature covered the widest area. Based on the monitoring data of 105 national meteorological stations in Xinjiang, this paper analyzed the intraseasonal evolution of extreme characteristics such as high temperature days, maximum temperature, duration of high temperature process and coverage of high temperature process in summer of 2023. The high temperature characteristics of each month during the season generally showed a trend of development-enhancement-reduction. And using the geopotential height field reanalysis data jointly produced by NCEP/NCAR, the staged changes of upper air circulation at 100 hPa and 500 hPa levels height field in summer of 2023 were compared. The intraseasonal changes of extreme high temperature in Xinjiang were closely related to the staged changes of the intensity, area and location of the southerly high and the Iranian subtropical high. When the southerly high was east, the intensity was stronger and the location was northerly, the Iranian high moved north and east, and the overall location was northerly. The high pressure ridge of the Qinghai-Tibet Plateau was strong, and the West Pacific subtropical high was eastward, which was conducive to the persistent extreme high temperature weather process in Xinjiang. When the southerly high was the Qinghai-Tibet Plateau type, the main position of the Iranian subtropical high was west, which was conducive to cold air entering Xinjiang from the north, causing staged cooling weather, and the extreme high temperature process in Xinjiang weakened and the duration was shortened. |
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