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主要的大气循环模式与中国东部夏季暴干旱的快速加剧有关

Feng Ma¹, Xing Yuan², Hua Li¹

¹Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China; School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China.

The Science of the total environment

|November 12, 2024

概括

由于大气沉降的强度和持续性,中国东部的快速干旱 (FD) 迅速加剧. 了解这些与循环模式相关的驱动因素,可以改善季后干旱预测.

科学领域:

大气科学大气科学
气候科学气候科学
干旱研究干旱研究

背景情况:

在中国东部,暴干 (FD) 正在迅速加剧,挑战季后预测.
快速FD发展的物理驱动因素仍然不太清楚.
将FD与缓慢干旱 (SD) 进行比较对于理解干旱加剧机制至关重要.

研究的目的:

调查导致中国东部快速暴发干旱加剧的主导物理过程.
将FD的机制与缓慢干旱 (SD) 的机制进行比较.
将干旱的发展与大规模的大气循环模式联系起来.

主要方法:

在中国东部四个地区对水分预算的诊断.
对FD和SD进行比较,以确定占主导地位的物理过程.
将干旱加剧的驱动因素与大规模的大气循环模式联系起来.

主要成果:

较强,持久的沉降是FD快速加剧的主要驱动因素,抑制降水并导致土壤干燥.
稳定的大气循环系统,包括特定的高压系统和喷流配置,促进了FD的发展.
存在区域差异,不同的循环模式 (例如,贝加尔湖高,环球远程连接,季风转移,亚热带高) 影响中国东北部,中国北部平原和中国南部的FD.

结论:

较强的沉降和稳定的大气循环是中国东部快速暴发干旱加剧的关键.
特定的区域循环模式,如亚热带高峰和喷流异常,起着至关重要的作用.
研究结果表明,中国东部夏季暴干的可预测性来源有助于预测和准备.

关键词:

异常沉降运动异常沉降运动中国东部的中国东部.快速的干旱是因为干旱.更稳定的大气循环模式.在设置机制上设置机制.

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