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标题：Hotspots, co-occurrence, and shifts of compound and cascading extreme climate events in Eurasian drylands
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作者：Huiqian Yu ; Nan Lu ; Bojie Fu 等
期刊名称：Environment International
印刷版ISSN：0160-4120
电子版ISSN：1873-6750
出版年度：2022
卷号：169
页码：1-15
DOI：10.1016/j.envint.2022.107509
语种：English
出版社：Pergamon
摘要：Highlights•A modified method combining percentile-based thresholds and empirical parameters is proposed and used to identify the spatial hotspots of compound and cascading climate extremes in Eurasia drylands.•Hotspots for each combination of extreme climate events are diverse, but the Mongolian Plateau, Central and West Asia and the Mediterranean are common hotspots for multiple combinations.•Spatial migration of compound drought and low-temperature over the past 40 years have been detected, and mid-latitudes will suffer extreme climate events that have never occurred before, which has not been reported in the past.AbstractEurasian drylands are the regions that are most vulnerable to climate change. Climate extremes have caused enormous or even devastating impacts on ecosystems and the social economy in this region, and the compound climate extremes (com_CEs, two or more extreme events occurring simultaneously) and cascading climate extremes (cas_CEs, two or more extreme events occurring successively) have exacerbated these problems. However, little is known about the occurrence patterns of com_CEs and cas_CEs in the Eurasian drylands. Based on the ERA5 reanalysis data range from 1979 to 2020, we improved the methodology for the extraction of co-occurrence events and identified high-frequency types, their hotspots, and occurrence rhythms (seasonally and annually) in Eurasian drylands. Our results showed that com_CEs and cas_CEs have high similarities in the types and spatial hotspots of extreme events; however, the former has a wider geographical and spatial distribution, and the latter has a longer duration. Specifically, co-occurring drought and heatwave events (DH) frequently appear in South Asia and western mid-latitude regions during summer, while in the winter, high latitude regions should be alert to the co-occurrence of drought and low-temperature events (DT). Central Asia and the Mongolian Plateau regions are prone to frequent drought and wind events (DW), and wind and high precipitation events (WP) in the spring and autumn. We have noticed that mid-latitude may suffer from extreme events that have never occurred before, such as com_DH being scattered sporadically in the first two decades and suddenly surging in West Asia and East Asia after the year 2000, and com_DT migrating from high-latitude areas such as the Arctic Ocean coast to mid-latitudes. Our results contribute to understanding hotspots of co-occurring CEs in Eurasian drylands, where more efforts will be needed in the future, especially in mid-latitudes which may suffer extreme climate events that have never occurred before.
关键词：KeywordsClimate extremesCompound extreme eventsCascading extreme eventsHotspotsST-DBSCANSpatial shifts