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在中国大陆发生的复合干旱和热浪事件的时空演变和内在驱动因素

Penghui Shi¹, Yi Li², Asim Biswas³

¹College of Water Resources and Architectural Engineering, Northwest A&F University/Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Yangling, Shaanxi, 712100, PR China.

The Science of the total environment

|July 18, 2024

概括

由于全球变暖,复合干旱和热浪 (CDH) 事件的频率和强度正在增加. 特别是热浪,显著地推动了这些破坏性气候极端事件的升级.

科学领域:

环境科学环境科学
气候科学气候科学
气象学天气学

背景情况:

复合干旱和热浪 (CDH) 事件构成重大威胁,与全球变暖相关的上升趋势.
了解CDH事件的时空动态和驱动因素对于气候适应和减缓至关重要.

研究的目的:

综合研究CDH事件的空间和时间演变.
确定CDH事件的内在驱动因素和贡献因素,包括干旱和热浪的相互依赖.
评估单个极端气候事件对CDH扩散的影响.

主要方法:

使用非静止标准化降水蒸发透气指数 (NSPEI) 和相对值方法识别CDH事件.
在整个气候次区域中量化CDH事件频率,强度和持续时间的空间和时间模式.
评估干旱和热浪相互依赖的贡献以及主要气候系统 (如WPSH和SAH) 的影响.

主要成果:

CDH事件显示出高度的空间异质性和频率,强度和持续时间的显著增加趋势.
干旱和热浪之间的积极相互依赖对CDH事件的增加做出了重大贡献.
热浪对CDH升级的影响比干旱更为明显;像WPSH和SAH这样的主要气候系统对中国的CDH事件产生影响.

结论:

由于气候变化,CDH事件的频率和严重程度正在增加.
干旱和热浪的相互依赖以及特定大气系统的影响是关键驱动因素.
调查结果为决策者和灾害管理者提供了关键的见解,帮助他们制定有针对性的气候适应战略.

关键词:

复合干旱和热浪事件发生.干旱和热浪之间的相互依赖性干旱干旱在干旱中热浪热浪热浪热浪中国大陆的中国大陆.

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