气象干旱的负-正反过渡值作为对农业干旱的反应及其动态
Xiaoting Wei1, Shengzhi Huang1, Jianfeng Li2
1State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China.
The Science of the total environment
|October 14, 2023
概括
这项研究引入了一种新的方法来量化气象和农业干旱之间的反. 它揭示了土地-气象学合的强度显著影响干旱反过渡,为干旱动态提供了新的见解.
科学领域:
- 环境科学 环境科学
- 水文学的水文学
- 气候科学 气候科学
背景情况:
- 在气象和农业干旱之间存在复杂的双向反.
- 在农业干旱加剧的情况下,这种反的过渡值和动态仍然不太清楚.
研究的目的:
- 开发一种新的定量方法来描述气象和农业干旱之间的相互反.
- 研究这种反关系的动态,包括跨越不同时间阶段的过渡值和灵敏度.
- 确定影响负-正反过渡值的主导因素.
主要方法:
- 利用葡萄的功能来定量评估气象和农业干旱之间的相互反.
- 将研究期分为两个阶段 (1982-1999年和2000-2018年),以分析环境变化下的反动态.
- 采用随机森林方法来探索影响反过渡值的主导因素.
主要成果:
- 确定8月份的负-正反过渡值通常低于6月和7月的中国大陆,西南河流盆地呈现出较大的值.
- 观察到气象干旱对农业干旱的反应在积极反期间比负面反更高的灵敏度.
- 发现过渡值在第二阶段 (2000-2018年) 一般下降,而积极反的敏感性增加.
- 确定陆地气象合强度是影响负-正反过渡值的主导因素,超过单个因素.
结论:
- 这项研究为了解干旱反机制提供了一个新的定量框架.
- 土地-气象学合强度是干旱反过渡的关键决定因素,突出了气候和土地表面过程的相互联系.
- 这些发现为干旱管理和预测在不断变化的环境中提供了关键的见解.
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