Abstract
Despite the prevalence of artificial separation of daytime and nighttime hot extremes, they may actually co-occur or occur sequentially. Considering their potential lead-lag configuration, this study identified an entire heatwave period as consecutive days with either daytime or nighttime hot extremes and investigated the changes of the prevalence and sequence of daytime and nighttime hot extremes during heatwaves over China from 1961 to 2017. It was found that the majority (82%) of heatwaves were compound heatwaves that had both daytime and nighttime hot extremes exceeding the 90th percentile-based thresholds, while only 7% (11%) were purely daytime (nighttime) heatwaves that contained only daytime (nighttime) hot extremes. During the entire periods of compound heatwaves, daytime hot extremes usually occurred one day or a few days before nighttime hot extremes, which was in accordance with the daily variations in radiation and meteorological conditions, such as the increasing surface humidity and cloud cover, and decreasing solar radiation during the entire heatwave periods. From 1961 to 2017, compound heatwave numbers exhibited the sharpest increase with a statistically significant trend of 0.44 times decade−1, in contrast to an insignificant trend of 0.00 times decade−1 for purely daytime heatwaves and a significant trend of 0.09 times decade−1 for purely nighttime heatwaves. Within the compound heatwave periods, hot nights were starting earlier and ending later, and numbers of concurrent daytime-nighttime hot extremes increased significantly at 0.20 days decade−1. In particular, urban area were not only subject to increasingly more frequent and longer compound heatwaves, but also to more occurrences of concurrent daytime-nighttime hot extremes with more serious impact. This study provides instructions for researchers to customize and select appropriate heatwave indices.
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Acknowledgements
We would like to thank Yang Chen from Chinese Academy of Meteorological Sciences for his valuable help. Surface meteorological observations were obtained from the Chinese Meteorological Administration (CMA, http://data.cma.cn/en). This work was supported by the National Key R&D Program (Grant No. 2016YFA0601502) and the National Natural Science Foundation of China (Grant Nos. 41822503 and 41375092).
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An, N., Zuo, Z. Changing structures of summertime heatwaves over China during 1961–2017. Sci. China Earth Sci. 64, 1242–1253 (2021). https://doi.org/10.1007/s11430-020-9776-3
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DOI: https://doi.org/10.1007/s11430-020-9776-3