Diurnal asymmetric warming, a critical feature of climate change, significantly impacts water-carbon exchange in terrestrial ecosystems. This study analyzes the spatiotemporal characteristics and long-term trends of the global diurnal temperature range (DTR) from 1961 to 2022 using ensemble empirical mode decomposition (EEMD). Our results reveal a trend reversal in global averaged DTR around 1988, shifting from a decrease to an increase, affecting 47% of global land areas. Subsequent to the reversal, the most pronounced increases were observed in temperate regions. Seasonal analysis shows earlier reversals in spring and summer, with accelerated change rates following the reversal. Additionally, increased surface solar radiation from reduced cloud cover caused daily maximum (T_max) temperatures to warm faster than the minimum (T_min), leading to a reversal and intensified DTR. These complex patterns underscore the need for targeted climate policies and adaptation strategies to tackle global warming.

中文翻译：

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近几十年来，全球陆地白天和夜间温度之间的不对称变暖速率增加


昼夜不对称变暖是气候变化的一个关键特征，对陆地生态系统中的水碳交换产生重大影响。本研究采用集成经验模态分解 （EEMD） 分析了 1961 年至 2022 年全球昼夜温度范围 （DTR） 的时空特征和长期趋势。我们的结果显示，1988 年左右全球平均 DTR 的趋势发生了逆转，从下降转变为上升，影响了全球 47% 的陆地面积。逆转后，温带地区观察到最明显的增加。季节性分析显示，春季和夏季的反转较早，反转后的变化率加快。此外，云量减少导致地表太阳辐射增加，导致日最高温度 （T _max ） 升温速度快于最低温度 （T _min ），导致 DTR 逆转并增强。这些复杂的模式凸显了制定有针对性的气候政策和适应战略来应对全球变暖的必要性。