| 四川省极端危害性高温变化特征分析 |
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| 引用本文： | 孙亦,王婷.四川省极端危害性高温变化特征分析[J].高原山地气象研究,2022,42(2):96-103. |
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| 作者姓名： | 孙亦 王婷 |
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| 作者单位： | 四川省气象灾害防御技术中心, 成都 610072 |
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| 基金项目： | 四川省气象局青年基金项目（SCQXKJQN2020048） |
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| 摘 要： | 利用1961~2020年国家气象站逐日最高气温资料和NCEP/NCAR再分析资料，对四川近60 a极端危害性高温时空分布特征及成因进行研究。结果发现:（1）近60 a四川省极端危害性高温总体上显著增多，并表现出明显的年代际变化；（2）四川省中部和西北部地区是极端危害性高温偏强区，东部和南部地区是极端危害性高温高发区；（3）四川省极端危害性高温可能与中纬度异常的高压带相关联。面积异常偏大、西伸脊点异常偏西且脊线异常偏北的西太平洋副热带高压和500 hPa青藏高原异常高压在中纬度地区形成一条强大的高压带，配合高层异常偏强的南亚高压，共同加强了对四川上空的高压控制，导致四川地区降水减少且气温偏高。另外，中高纬大气环流经向度偏弱，四川盆地盛行偏南风，冷空气难以南下，在这种有利的环流形势配合以及干燥的地表环境影响下，四川地区易出现极端危害性高温天气。
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| 关 键 词： | 极端危害性高温 变化特征 环流特征 四川 |
| 收稿时间： | 2021-12-06 |
Variation Impact of Extreme Hazardous High Temperature in Sichuan |
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| Institution: | Sichuan Meteorological Disaster Prevention Technology Centre, Chengdu 610072, China |
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| Abstract: | Based on the daily maximum temperature data of Sichuan National Station and NCEP/NCAR reanalysis data from 1961 to 2020, the temporal and spatial distribution characteristics and causes of extreme hazardous high temperature in Sichuan province in recent 60 years were studied. The results show that: (1) In the past 60 years, the extreme hazardous high temperature in Sichuan province increased significantly, and showed obvious interdecadal changes. (2) The central and northwestern parts of Sichuan province were the areas with high incidence of extremely hazardous high temperature, while the eastern and southern parts were the areas with high occurrence of extremely hazardous high temperature. (3) The extremely hazardous high temperature in Sichuan province might be associated with the abnormal high pressure belt in mid-latitude. The western Pacific subtropical high with abnormal large area, abnormal west ridge point and abnormal north ridge line combined with the Tibetan Plateau (500hPa) abnormal high formed a strong high belt in mid-latitude region. In addition, the longitude of atmospheric circulation at middle and high latitudes was not strong, and the leaning south winds prevailed in Sichuan Basin, making it difficult for cold air to move southward. In coordination with this favorable circulation pattern and under the influence of dry surface environment, extreme hazardous high temperature weather was caused in Sichuan Province. |
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