对热浪事件的综合天气模式的分析
Sergi Ventura1, Josep Ramon Miró2, Juan Carlos Peña2
1Sostenipra Research Group (SGR 01412), Institute of Environmental Science and Technology (MDM-2015-0552), Z Building, Universitat Autònoma de Barcelona (UAB), Campus UAB, 08193 Bellaterra, Barcelona Spain.
Climate dynamics
|October 19, 2023
概括
热浪正在加剧,但了解它们的大气模式是关键. 这项研究确定了影响热浪的四个主要综合模式,并预测了不同气候场景下的未来变化.
科学领域:
- 气候学 气候学 气候学
- 气象学 天气学
- 大气科学 大气科学
背景情况:
- 预计全球热浪的频率和强度将增加.
- 目前的研究主要集中在温度上,忽视了关键的大气动力学.
- 对于中度地区来说,了解共视和中度行为至关重要.
研究的目的:
- 通过结合温度和综合模式来定义和理解热浪.
- 分析区域 (伊比利亚半岛) 和城市 (巴塞罗那) 的热浪行为.
- 在气候变化场景下,预测未来热浪同步模式的变化.
主要方法:
- 历史数据 (1950-2020年) 的多变量分析,包括平均海平面压力,500hPa的地势高度和每天最大2米的温度.
- 识别了四种独特的热浪特征的综合模式.
- 将分析应用于协调区域气候降级实验 (CORDEX) 的代表性度路径 (RCP) 4.5 和 8.5 场景.
主要成果:
- 四种共见模式:静止和稳定,动态和向导,静止和向导,动态,向导和波浪解释了超过50%的热浪变异.
- 预计这四种模式将继续解释未来场景中55%至60%的热浪变异.
- 未来的热浪可能会在500hPa的地势高度上升,这是由于反气旋山脊向北移动,特别是在RCP8.5.5下.
结论:
- 温度和综合模式的结合方法提供了对热浪的更全面的了解.
- 地势高度和偏向方向是预测未来热浪行为的关键因素.
- 预计气候变化,特别是在RCP8.5下,将加剧大气动力和改变热浪特征.
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