The influence of cloud cover on elevation-dependent warming over the Tibetan Plateau from 1984 to 2022

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2025-04-30 DOI:10.1016/j.atmosres.2025.108188

Yuqing Wu , Jing Gao

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引用次数: 0

Abstract

Temperatures on the Tibetan Plateau (TP) have been increasing over the past 50 years, with the warming trend accelerating from +0.16 °C/decade between the mid-1980s and 1990s to +0.36 °C/decade from 2000 to 2022. However, the elevation-dependent warming (EDW) on the TP remains controversial, and the driving mechanisms are poorly understood. Utilizing the ERA5-Land dataset, we investigate EDW patterns across both the Endorheic and Exorheic basins on the TP, focusing on cloud cover characteristics and quantifying the influences of clouds at different levels on EDW through the Random Forest analysis. Our findings reveal distinct EDW patterns, with more pronounced warming occurring at night. Between 2000 and 2022, changes in cloud cover, particularly the increase in high cloud cover at night and middle cloud cover during the day, played a crucial role in modulating temperature trends. The effect of diurnal net cloud radiative forcing (CRF) from 1984 to 2022 is characterized by daytime heating in the western TP, cooling in the eastern TP, and uniform nighttime warming across the TP. The reduction in middle and high cloud cover from 1984 to 2000 was associated with overall warming, while from 2000 to 2022, albedo diminished from middle clouds and increased longwave radiation from high clouds contributed to continued warming, particularly at higher elevations. These findings highlight the role of CRF in amplifying EDW and emphasize the significance of cloud radiative processes in driving regional warming. The study provides valuable insights into the mechanism underlying the accelerated warming on the TP

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1984 - 2022年青藏高原云量对高程增温的影响

近50年来青藏高原气温呈上升趋势，升温趋势从20世纪80年代中期至90年代中期的+0.16°C/ 10年加速到2000年至2022年的+0.36°C/ 10年。然而，海拔依赖性增温对TP的影响仍然存在争议，其驱动机制也知之甚少。利用ERA5-Land数据集，研究了青藏高原内海盆地和外海盆地的EDW模式，重点研究了云层覆盖特征，并通过随机森林分析量化了不同水平云层对EDW的影响。我们的发现揭示了独特的EDW模式，夜间变暖更为明显。2000 - 2022年期间，云量的变化，特别是夜间高云量和白天中云量的增加，在调节温度趋势方面发挥了关键作用。1984 - 2022年青藏高原日净云辐射强迫（CRF）的影响表现为青藏高原西部白天变暖，东部变冷，夜间均匀变暖。1984年至2000年中高层云量的减少与总体变暖有关，而2000年至2022年，中层云反照率的减少和高层云长波辐射的增加导致了持续变暖，特别是在高海拔地区。这些发现突出了CRF在放大EDW中的作用，并强调了云辐射过程在驱动区域变暖中的重要性。该研究为青藏高原加速变暖的机制提供了有价值的见解

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.