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上层热层-下层平流层臭氧驱动夏季降雨和西西伯利亚野火变化

Fei Xie¹, Yan Xia¹, Wenshou Tian²

¹School of Systems Science, Beijing Normal University, Beijing 100875, China.

Science bulletin

|November 23, 2024

概括

西伯利亚的野火受到夏季降水的影响,这与大气上层臭氧有关. 臭氧层的减少可能会增加野火风险,因为西西伯利亚降水量减少.

科学领域:

大气科学大气科学
气候动力学气候动力学
北极的生态系统

背景情况:

西伯利亚野火对北极生态系统和全球碳循环动态产生重大影响.
西西伯利亚的夏季降水历史上影响了野火的频率和强度.
了解气候驱动因素对于预测该地区野火风险至关重要.

研究的目的:

分析西西伯利亚1982-2021年降水趋势.
调查降水变化和大气上层臭氧度之间的相关性.
阐明平流层化学与区域气候和野火活动联系的机制.

主要方法:

使用观测和过渡性气候模拟来分析降水数据.
降水趋势与在高层热层-低层平流层 (UTLS) 的臭氧度之间的相关性分析.
研究大气循环异常,包括喷流转移和热层压力系统.

主要成果:

在西西伯利亚降水变化和UTLS臭氧度之间发现了强烈的相关性.
增加的UTLS臭氧与大气上层变暖,极地喷流向南转移以及夏季降水量的增加有关.
1993-2010年降水量的增加与UTLS臭氧的增加相关;自2010年以来臭氧的下降可能会抑制降水.

结论:

平流层臭氧化学在调节西西伯利亚夏季降水模式方面发挥着至关重要的作用.
超低温区域臭氧度的变化可能会改变大气循环,影响区域气候和野火风险.
由于降水量减少,UTLS臭氧水平的下降可能会增加西伯利亚未来野火的可能性.

关键词:

臭氧臭氧是一种臭氧.降水量降水量降水量辐射效应是一种辐射效应.西伯利亚西伯利亚西伯利亚西伯利亚上层热层层-下层平流层.

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