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<p>Based on observational data and 21 realizations of seven climate models participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6), this paper systematically investigates the seasonally asymmetric anthropogenic impacts on the diurnal temperature range (DTR) over East Asia from 1950 to 2014. The DTR exhibits a significantly stronger declining trend in winter (− 0.16&#xa0;°C per decade) than in summer (− 0.079&#xa0;°C per decade), which is well reproduced by the all-forcing simulations, while the natural-only experiment shows no significant changes, underscoring the dominant role of human activities. Further analysis reveals that greenhouse gases (GHGs) and aerosols exert seasonally distinct impacts on DTR. In summer, both forcings contribute to the decline. Aerosols reduce the daily maximum temperature (TMX) more than the daily minimum temperature (TMN) by modifying shortwave radiation and enhancing the evaporative fraction, thus driving the DTR decrease over eastern East Asia. In contrast, over the Himalayas, GHG-induced enhancement of clear-sky longwave radiation results in a faster increase in TMN than TMX, leading to a reduced DTR. In winter, the DTR decline across East Asia is primarily attributed to GHGs, whereas aerosols have minimal impact. The seasonal asymmetry in DTR response is mainly driven by differences in the indirect radiative effects of GHGs and aerosols, particularly through their modulation in cloud cover and evaporative fraction.</p>

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Seasonally asymmetric impacts of human activities on the diurnal temperature range over East Asia

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Yue Shi,
  • Yanting Zhang

摘要

Based on observational data and 21 realizations of seven climate models participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6), this paper systematically investigates the seasonally asymmetric anthropogenic impacts on the diurnal temperature range (DTR) over East Asia from 1950 to 2014. The DTR exhibits a significantly stronger declining trend in winter (− 0.16 °C per decade) than in summer (− 0.079 °C per decade), which is well reproduced by the all-forcing simulations, while the natural-only experiment shows no significant changes, underscoring the dominant role of human activities. Further analysis reveals that greenhouse gases (GHGs) and aerosols exert seasonally distinct impacts on DTR. In summer, both forcings contribute to the decline. Aerosols reduce the daily maximum temperature (TMX) more than the daily minimum temperature (TMN) by modifying shortwave radiation and enhancing the evaporative fraction, thus driving the DTR decrease over eastern East Asia. In contrast, over the Himalayas, GHG-induced enhancement of clear-sky longwave radiation results in a faster increase in TMN than TMX, leading to a reduced DTR. In winter, the DTR decline across East Asia is primarily attributed to GHGs, whereas aerosols have minimal impact. The seasonal asymmetry in DTR response is mainly driven by differences in the indirect radiative effects of GHGs and aerosols, particularly through their modulation in cloud cover and evaporative fraction.