However, there exists a negative trend in the number of heat event days in southern North China, where the downtrend is possibly reflected as a regional response to inter-decadal and inter-annual variability 35 , 36 .
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More frequent and widespread persistent compound drought and heat event observed in China.
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Results indicate that number of drought days illustrates a decreasing trend in southeastern China and Northwest China from 1961 to 2018, while it shows an increasing trend in Southwest China and North China (Fig. 1 a).