早期出现和人类诱导的步行者循环减弱的决定因素
Mingna Wu1, Chao Li2, Matthew Collins3
1Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan, China. wumingna@cug.edu.cn.
Nature communications
|October 25, 2024
概括
预计温室气体的变暖将削弱沃克循环. 人类引起的变化在高层大气中比在表面更早地出现,受海洋温度调节的影响.
科学领域:
- 气候科学 气候科学
- 大气动力学 大气动力学
- 海洋学 海洋学 海洋学
背景情况:
- 温室气体的变暖预计将改变全球大气循环模式.
- 由于自然气候变化,检测人类对沃克循环的影响是复杂的.
研究的目的:
- 为了调查在步行者循环中人类诱导的变化的出现.
- 确定这些变化的机制和模型依赖性.
主要方法:
- 来自合模型相互比较项目的第6阶段 (CMIP6) 的多模型合集的分析.
- 在不同的大气层中出现时间的比较,以及它们与海面温度梯度的关系.
主要成果:
- 人类引起的沃克循环减弱在中上热带层比表面更早出现.
- 这种较早的出现与对高层大气中二氧化碳辐射强迫的较强初始反应有关.
- 出现时间的模型间变化由海洋恒温器机制调节,影响热带印度太平洋海面温度梯度.
结论:
- 提供了人类诱导的步行者循环变化的检测能力的证据,在上层大气层更早的信号.
- 突出了海洋-大气相互作用在调节气候模型反应中的作用.
- 提供了评估与改变大气循环模式相关风险的见解.
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