微雨加剧了极端潮湿的高温
Zhanjie Zhang1, Yong Wang2, Guang J Zhang3
1Ministry of Education Key Laboratory for Earth System Modeling and Department of Earth System Science, Tsinghua University, Beijing, China.
Nature communications
|August 26, 2024
概括
轻微的雨,与直觉相反,可以通过增加湿度和延长其持续时间来加剧潮湿的热浪,特别是在干旱地区. 调整气候模型以适应小雨偏差可以改善对这些极端热情事件的预测.
科学领域:
- 气候学 气候学 气候学
- 大气科学 大气科学
- 环境科学 环境科学
背景情况:
- 潮湿的热浪对人类健康和生态系统构成重大风险.
- 降雨是直观地预期减轻极端的热量,但其细微的作用是研究不足.
研究的目的:
- 为了研究轻雨和极端潮湿热事件之间的复杂关系.
- 分析轻雨对潮湿热浪频率,强度和持续时间的影响.
- 评估全球气候模型 (GCM) 在模拟轻雨及其对潮湿热的影响方面的表现.
主要方法:
- 对观测数据和气候模型模拟的分析.
- 在不同的降雨条件下 (没有雨,轻雨,中等到大雨) 湿热波特征的比较.
- 一个GCM的偏差校正,以考虑轻雨的高估.
主要成果:
- 轻雨,而不是缓解,往往加剧潮湿的热浪,特别是在干旱和半干旱地区.
- 轻雨通过增强的蒸发增加了近地表面的湿度,而不会显著减少太阳辐射.
- 连续的湿热极端受到通过水补充和较浅的行星边界层的轻微雨来维持.
- 全球气候变化系统高估了轻雨,导致不准确的潮湿热浪预测.
结论:
- 轻微的雨在极端潮湿热的动态中起着关键的,被低估的作用.
- 在GCM中精确模拟轻雨对于可靠预测潮湿热浪至关重要.
- 研究结果强调,需要考虑轻雨对气候变化适应和减缓战略的影响.
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