Chen Jingchuan, Xu Jianzhong, Wu Zhijun, Meng Xiangxinyue, Yu Yan, Ginoux Paul, DeMott Paul J, Xu Rui, Zhai Lixiang, Yan Yafei, Zhao Chuanfeng, Li Shao-Meng, Zhu Tong, Hu Min
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China.
Sci Adv. 2024 Sep 13;10(37):eado0885. doi: 10.1126/sciadv.ado0885.
Ice-nucleating particles (INPs) can initiate cloud ice formation, influencing cloud radiative effects (CRE) and climate. However, the knowledge of INP sources, concentrations, and their impact on CRE over the Tibetan Plateau (TP)-a highly climate-sensitive region-remains largely hypothetical. Here, we integrated data from multisource satellite observations and snowpack samples collected from five glaciers to demonstrate that dust particles constitute primary INP sources over the TP. The springtime dust influxes lead to seasonally elevated ice concentrations in mixed-phase clouds. Furthermore, the decadal reduction in dustiness from 2007 to 2019 results in decreased springtime dust INPs, thereby amplifying the cooling effect of clouds over the TP, with a 1.98 ± 0.39-watt per square meter reduction in surface net CRE corresponding to a 0.01 decrease in dust optical depth. Our findings elucidate previously unidentified pathways of climate feedback from an atmospheric INP perspective, especially highlighting the crucial role of dust in aerosol-cloud interactions.
冰核粒子（INPs）能够引发云冰形成，影响云辐射效应（CRE）和气候。然而，在青藏高原（TP）这个对气候高度敏感的地区，关于冰核粒子的来源、浓度及其对云辐射效应的影响，很大程度上仍只是假设。在此，我们整合了多源卫星观测数据以及从五条冰川采集的积雪样本数据，以证明沙尘颗粒是青藏高原冰核粒子的主要来源。春季沙尘输入导致混合相云中冰浓度季节性升高。此外，2007年至2019年期间沙尘含量的年代际减少导致春季沙尘冰核粒子减少，从而增强了青藏高原上空云的冷却效应，沙尘光学厚度每降低0.01，地表净云辐射效应就相应减少1.98±0.39瓦每平方米。我们的研究结果从大气冰核粒子的角度阐明了此前未被认识到的气候反馈途径，尤其凸显了沙尘在气溶胶 - 云相互作用中的关键作用。
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