孙文慧,韩琳,刘雪宇

• 1:成都信息工程大学大气科学学院
• 2:青海省海东市气象局
• 3:中国科学院大气物理研究所大气边界层和大气化学国家重点实验室
• 4:甘肃省张掖市气象局

摘要(Abstract)：

【目的】全球气候变暖背景下极端气候事件频发，为诊断气候变化环境下四川省极端气温事件的动态演变特征，【方法】基于1969—2019年四川省33个国家地面气象观测站逐日最高和最低气温资料，利用线性倾向估计法、反距离加权法和Mann-Kendall突变检验法分析了四川省近50 a极端气温事件的时空变化特征，并探讨了海拔高度等因子对各极端气温指数的影响。【结果】结果显示：四川省极端气温事件存在明显的年际变化和空间分布特征，海拔高度为影响四川省极端气温指数的最主要影响因子。【结论】结果表明：(1)四川省极端暖事件显著增加，极端冷事件显著减少；极端气温指数中霜冻日数、冷日指数和冷夜指数均未检测到突变点，其余指数存在明显突变。(2)受复杂地形影响，四川省极端气温存在明显空间差异，位于低海拔地区的叙永为年内日最高气温值最大、高温日数出现最多的地区；高海拔地区的红原为年内日最低气温值最低的地区，色达为霜冻日数出现最多的地区，巴塘为暖日和暖夜日数最少的地区，若尔盖为冷日和冷夜日数最多的地区。(3)经度、海拔高度和平均气温均会影响极端气温指数，而海拔高度为极端气温指数的最主要影响因子，极端暖指数由低海拔区向高海拔区递减，而极端冷指数由高海拔区向低海拔区递减。上述结果为制定合理的灾害减缓措施提供了科学依据。

关键词(KeyWords)： 四川省;极端气温;时空变化;突变检验;全球变暖

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(4101075)

作者(Author): 孙文慧,韩琳,刘雪宇

DOI: 10.13928/j.cnki.wrahe.2023.07.010

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