与夏季温度变化趋势相关的循环模式北美地区的温度变化模式
Chibuike Chiedozie Ibebuchi1,2, Cameron C Lee3,4
1Department of Geography, Kent State University, Kent, OH, USA. cibebuch@kent.edu.
Scientific reports
|August 2, 2023
概括
北美夏季气温因循环变化而升温,这与全球变暖和北极海冰流失有关. 这些变化会影响区域温度趋势和极端天气事件.
科学领域:
- 气候学 气候学 气候学
- 大气科学 大气科学
- 气象学 天气学
背景情况:
- 区域温度趋势受到复杂的循环模式的影响.
- 了解这些模式对于气候变化适应和减缓至关重要.
研究的目的:
- 描述北美北极夏季气温的变化.
- 将温度趋势与大气循环异常联系起来.
- 研究全球变暖对区域气候模式的影响.
主要方法:
- 旋转S模式主要组件分析 (PCA) 应用于观测和重新分析温度数据集 (1979-2022).
- 分析2M温度数据和ERA5再分析数据的分析.
- 循环模式和温度变化之间的相关性分析.
主要成果:
- 从1979年到2022年夏季观察到的温度变化模式的显著趋势.
- 反气旋循环异常与格陵兰岛,加拿大东北部和阿拉斯加的温度升高有关.
- 太平洋东北部海岸的旋风循环与北美西北部的变暖有关.
- 全球气温的增加与温暖的气候中循环幅度的增加有关.
- 北极振荡的负面阶段与格陵兰岛/加拿大东北部的变暖有关.
- 加强北极反气旋循环解释了68%的海冰减少.
结论:
- 全球变暖和太平洋变暖调节循环模式,增加北美温暖的政权.
- 这些循环转移显著影响区域温度,并导致北极海冰的减少.
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