Temporal and spatial variation of diurnal asymmetric warming and its drivers in China

doi:10.7523/j.ucas.2022.042

Abstract

Abstract: Recently, a major feature of global warming is asymmetrical temperature increase during day and night, i.e., the rate of warming at night is greater than that during the day. However, effects of asymmetrical warming have not yet attracted widespread attention. In this study, by collecting historical observation data of 838 meteorological stations in China, and using methods such as trend estimation, the characteristics of the temporal and spatial variation of diurnal temperature range (DTR) and the long-term trends of DTR from 1952 to 2018 were analyzed. The results indicated that:spatially, the regions with the highest average annual DTR in the country were distributed in the northwest and southwest, followed by the northeast and north China, and the areas with lowest DTR located in central, eastern, and southern China. The average monthly DTR in the year was generally multimodal. Among four seasons, DTR in spring and autumn was higher than in summer. From 1952 to 2018, the annual average DTR decreased significantly (τ=-0.396; p<0.01). Long-term changes in DTR were positively correlated with evaporation, sunshine hours, latitude and altitude, and negatively correlated with wind speed, precipitation, relative humidity, station pressure, total cloudiness, and longitude.

Key words: climate change, asymmetric warming, temporal and spatial changes, influencing factors

CLC Number:

P423.3+1

HE Chang, DENG Jianming, CHEN Shuang. Temporal and spatial variation of diurnal asymmetric warming and its drivers in China[J]. Journal of University of Chinese Academy of Sciences, 2023, 40(5): 596-604.

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