Reversed asymmetric warming of sub-diurnal temperature over land during recent decades

Ziqian Zhong, Bin He (), Hans W. Chen, Deliang Chen, Tianjun Zhou, Wenjie Dong, Cunde Xiao, Shang-ping Xie, Xiangzhou Song, Lanlan Guo, Ruiqiang Ding, Lixia Zhang, Ling Huang, Wenping Yuan, Xingming Hao, Duoying Ji and Xiang Zhao
Additional contact information
Ziqian Zhong: Beijing Normal University
Bin He: Beijing Normal University
Hans W. Chen: Chalmers University of Technology
Deliang Chen: University of Gothenburg
Tianjun Zhou: Chinese Academy of Sciences
Wenjie Dong: Sun Yat-Sen University
Cunde Xiao: Beijing Normal University
Shang-ping Xie: University of California San Diego
Xiangzhou Song: Hohai University
Lanlan Guo: Beijing Normal University
Ruiqiang Ding: Beijing Normal University
Lixia Zhang: Chinese Academy of Sciences
Ling Huang: Peking University
Wenping Yuan: Sun Yat-Sen University
Xingming Hao: Chinese Academy of Sciences
Duoying Ji: Beijing Normal University
Xiang Zhao: Beijing Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract In the latter half of the twentieth century, a significant climate phenomenon “diurnal asymmetric warming” emerged, wherein global land surface temperatures increased more rapidly during the night than during the day. However, recent episodes of global brightening and regional droughts and heatwaves have brought notable alterations to this asymmetric warming trend. Here, we re-evaluate sub-diurnal temperature patterns, revealing a substantial increase in the warming rates of daily maximum temperatures (Tmax), while daily minimum temperatures have remained relatively stable. This shift has resulted in a reversal of the diurnal warming trend, expanding the diurnal temperature range over recent decades. The intensified Tmax warming is attributed to a widespread reduction in cloud cover, which has led to increased solar irradiance at the surface. Our findings underscore the urgent need for enhanced scrutiny of recent temperature trends and their implications for the wider earth system.

Date: 2023
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DOI: 10.1038/s41467-023-43007-6

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