| 增暖背景下2023年4—5月新疆低温维持机制浅析 |
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| 引用本文： | 刘艳,郑育琳,刘精,陈颖.增暖背景下2023年4—5月新疆低温维持机制浅析[J].新疆气象,2023,17(6):60-66. |
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| 作者姓名： | 刘艳 郑育琳 刘精 陈颖 |
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| 作者单位： | 新疆维吾尔自治区气候中心,新疆维吾尔自治区气象台,新疆维吾尔自治区气候中心,新疆维吾尔自治区气候中心 |
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| 摘 要： | 2023年春季新疆平均气温阶段性变化明显，4—5月平均气温为近20年同期第二低，增暖背景下春季连续两个月气温偏低实属罕见。基于新疆89个站点2023年春季气温数据和大尺度环流再分析资料，分析2023年4—5月新疆平均气温异常偏低的维持机制。结果表明： 4—5月新疆气温偏低主要受3次寒潮过程影响，多次强冷空气南侵并占据主导地位；欧亚中高纬海平面气压正、负异常中心形成的南北气压梯度力、明显偏强的欧亚大陆冷高压；中层长波槽脊系统的发展和偏北气流等因素导致冷空气势力明显增强；低层西风气流的减弱和西北气流的异常加强,欧洲大陆及蒙古至中西伯利亚上空异常反气旋和气旋分布，促使冷空气加强南侵；关键区因子的异常加强，西伯利亚低槽的长时间维持，使得冷空气在新疆盘踞，是造成4—5月新疆气温持续偏低的重要原因。
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| 关 键 词： | 异常低温 新疆 大气环流 维持机制 |
| 收稿时间： | 2023/7/25 0:00:00 |
| 修稿时间： | 2023/8/19 0:00:00 |
Analysis of the mechanisms for maintenance of low temperature in Xinjiang in April-May 2023 under climate warming background |
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| liuyan,zhengyulin,liujing and chenying.Analysis of the mechanisms for maintenance of low temperature in Xinjiang in April-May 2023 under climate warming background[J].Bimonthly of Xinjiang Meteorology,2023,17(6):60-66. |
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| Authors: | liuyan zhengyulin liujing and chenying |
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| Institution: | Xinjiang Climate Center,Xinjiang Meteorological Observatory,Xinjiang Climate Center,Xinjiang Climate Center |
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| Abstract: | In the spring of 2023, the average air temperature in Xinjiang varied significantly in stages, and the average air temperature in April-May was the second lowest in history in the same period of the last 20 years, and it is rare to have two consecutive months of low air temperature in spring against the background of warming. Based on the 2023 spring temperature data from 89 stations in Xinjiang and the large-scale circulation reanalysis data, analyzing the maintenance mechanism of abnormally low temperature in April-May 2023 in Xinjiang. The results show that the low temperatures in April-May in Xinjiang are mainly affected by three cold wave processes, the southward invasion and dominance of strong cold air, the pressure gradient force formed by the positive and negative anomalous centers of sea level pressure in the middle and high latitudes of Eurasia, the enhanced Eurasian cold high, the development of the long-wave trough ridge systems, the mid-level guiding airflow and other factors enhanced the cold air force; the weakening of the low-level westerly airflow and the anomalous intensification of the northwesterly airflow, as well as the anomalous anticyclonic and cyclonic distribution over continental Europe and Mongolia to Central Siberia, contributed to the intensification of the southward invasion of cold air; the anomalous strengthening of the key factors of the region, and the prolonged maintenance of the Siberian trough made the cold air entrenched in Xinjiang, which was an important reason for the persistently low temperature in Xinjiang from April to May. |
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| Keywords: | abnormal low temperature Xinjiang atmospheric circulation maintenance mechanism |
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