伊比利亚半岛复合干旱和热浪事件的水分和感热通量异常量化

IF 6.9 1区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Albenis Pérez-Alarcón , Marta Vázquez , Alexandre M. Ramos , Raquel Nieto , Joaquim G. Pinto , Luis Gimeno
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引用次数: 0

摘要

复合干旱和热浪事件(CDHWs)是一种天气和气候灾害,其频率在全球许多地区都在增加。本文采用基于ERA5再分析驱动的拉格朗日FLEXPART模式输出的新颖拉格朗日大气水汽和热量跟踪框架,量化了1991 - 2022年夏季(5 - 10月)伊比利亚半岛CDHWs的水汽和感热通量异常。基于日最高和最低气温的第95百分位和自校准的有效干旱指数来确定干旱日。然后将拉格朗日框架应用于影响伊比利亚半岛大陆50%以上地区的前20个最严重的贫困地区。我们的分析显示,这些事件平均持续10.35天,2022年在干热条件下达到最高天数(46天)。CDHW事件通常与阻塞情况和高压系统有关,其影响可被局部陆地-大气反馈放大。结果表明,伊比利亚半岛本身是夏季低降水的主要水汽来源,其次是北大西洋走廊和西地中海,但它们的总水汽贡献在CDHWs期间减少了约56%。此外,感热源模式表现出局地-区域的起源,在干热事件期间比气候值高35%。总的来说,这项研究为cdhw的潜在机制提供了新的见解,这可能有助于在全球变暖的背景下理解这些事件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantifying moisture and sensible heat flux anomalies for compound drought and heat wave events in the Iberian Peninsula
Compound drought and heat wave events (CDHWs) are weather and climate hazards whose frequency is increasing in many regions across the globe. Here, we applied a novel Lagrangian atmospheric moisture and heat tracking framework to the outputs of the Lagrangian FLEXPART model driven by the ERA5 reanalysis to quantify the moisture and sensible heat flux anomalies for CDHWs occurred in the Iberian Peninsula in the extended summer (May–October) from 1991 to 2022. CDHWs are identified based on the 95th percentile of daily maximum and minimum temperatures and the self-calibrating Effective Drought Index. The Lagrangian framework is then applied to the top 20 CDHWs affecting more than 50% of continental Iberian Peninsula. Our analysis reveals that these events endure on average 10.35 days, with 2022 achieving the highest number of days (46 days) under dry and hot conditions. CDHW events are generally associated with blocking situations and high-pressure systems, whose effects can be amplified by the local land-atmosphere feedback. The results indicate that the Iberian Peninsula itself is the principal moisture source for the low summertime precipitation, followed by the North Atlantic Ocean corridor and the western Mediterranean Sea, but their total moisture contribution decreases by about 56% during the CDHWs. Moreover, the sensible heat sources pattern exhibits a local-to-regional origin, with ∼35% above the climatological value during the dry and hot events. Overall, this study provides new insight into the underlying mechanisms of CDHWs, which could be useful for helping in understanding these events in the context of global warming.
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来源期刊
Weather and Climate Extremes
Weather and Climate Extremes Earth and Planetary Sciences-Atmospheric Science
CiteScore
11.00
自引率
7.50%
发文量
102
审稿时长
33 weeks
期刊介绍: Weather and Climate Extremes Target Audience: Academics Decision makers International development agencies Non-governmental organizations (NGOs) Civil society Focus Areas: Research in weather and climate extremes Monitoring and early warning systems Assessment of vulnerability and impacts Developing and implementing intervention policies Effective risk management and adaptation practices Engagement of local communities in adopting coping strategies Information and communication strategies tailored to local and regional needs and circumstances
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