Atmospheric moisture transport is pivotal in regulating water resources over the Tibetan Plateau (TP). With the growing concerns about climate change, understanding the evolution of atmospheric moisture transport over the TP has become increasingly critical. however, the spatiotemporal distinctions of this transport remain poorly understood in the CMIP6 models. Here, we conducted a comprehensive evaluation of simulated historical atmospheric moisture transport from 33 CMIP6 models, utilizing a novel methodology that assesses the accuracy of model simulations in replicating regional atmospheric moisture transport over the TP. Our results indicate that the CMIP6 models generally succeed in reproducing the broad spatial patterns of atmospheric moisture transport. Nonetheless, substantial errors occur during the monsoon period, primarily attributable to inaccuracies in the location, movement, and intensity of the simulated Indian summer monsoon. The coarser resolution and poor representation of physical processes are potential reasons for errors in atmospheric moisture transport simulation over the TP. The Failure to simulate the terrain blocking on atmospheric moisture transport exacerbates these deficiencies, leading to significant discrepancies. Of the 33 CMIP6 models we investigated, over one-third displayed serious deficiencies in this regard. While coarser resolution and orographic gravity waves are plausible factors, they do not fully account for all the results obtained in this study. Insufficiently detailed or inaccurate topographic data used in the models may also contribute to this deficiency. This study highlights the necessity of using rigorously evaluated models to develop effective regional adaptation strategies over the Tibetan Plateau.

大气中的水分输送对于调节青藏高原 （TP） 的水资源至关重要。随着对气候变化的日益关注，了解高原上大气水分输送的演变变得越来越重要。然而，在 CMIP6 模型中，这种传输的时空差异仍然知之甚少。在这里，我们对 33 个 CMIP6 模型的模拟历史大气水汽输送进行了全面评估，利用一种新的方法评估了模型模拟在复制 TP 上区域大气水汽输送的准确性。我们的结果表明，CMIP6 模型通常成功地再现了大气水分输送的广泛空间模式。尽管如此，季风期间还是会出现重大错误，主要是由于模拟印度夏季季风的位置、运动和强度不准确。较粗糙的分辨率和物理过程的较差表示是 TP 上大气水分输送模拟误差的潜在原因。未能模拟大气水分输送的地形阻塞加剧了这些缺陷，导致显着差异。在我们调查的 33 个 CMIP6 模型中，超过三分之一的模型在这方面表现出严重缺陷。虽然较粗的分辨率和地形重力波是合理的因素，但它们并不能完全解释本研究中获得的所有结果。模型中使用的地形数据不够详细或不准确也可能导致这种缺陷。本研究强调了使用严格评估的模型来制定青藏高原有效区域适应策略的必要性。