Weakening summer westerly circulation actuates greening of the Tibetan Plateau

文献类型： 外文期刊

第一作者： Wang, Zhipeng

作者： Wang, Zhipeng;Niu, Ben;He, Yongtao;Zhang, Jing;Zhang, Yangjian;Zhang, Xianzhou;Wang, Zhipeng;He, Yongtao;Zhang, Yangjian;Zhang, Xianzhou;Zhang, Jing;Wu, Jianshuang;Wang, Xiangtao

作者机构：

关键词： Greening; Climate change; Westerly wind; South Asia monsoon; Teleconnection; Tibetan Plateau

期刊名称：GLOBAL AND PLANETARY CHANGE （ 影响因子：3.9； 五年影响因子：5.0 ）

ISSN： 0921-8181

年卷期： 2023 年 221 卷

页码：

收录情况： SCI

摘要： Greening of the Earth is among the world's most important ecological changes in recent decades, but its effects and triggers are multifaceted and varied across the globe. Climate change is the primary driver for greening of the Tibetan Plateau (TP), where vegetation is of great significance for resident survival, carbon sequestration and climate feedbacks. However, the spatial variability of greening and its drivers are not well-understood on the TP. Here, we compiled multi-source vegetation indices, climate and atmospheric data to investigate the greenness spatiotemporal variability and its linkage with large-scale climate oscillations. We found that greening domi-nated the TP during 1980s-2010s and positive trends in satellite-based vegetation indices account for >70% of the TP. Specifically, the arid and semi-arid TP experienced a significant and higher greening rate due to the remarkable increase in precipitation. We further clarified the domains of the South Asian monsoon (SAMI1 and SAMI2), the westerly wind (WI) and the plateau monsoon (TPMI) on the TP, and realized that the wetness in-crease in the arid and semi-arid was correlated with a weakening WI. Detecting the linkage between WI with large-scale climate oscillations, we suggested that the decadal weakening WI was induced by a warmer North Atlantic SST (positive AMO phase), which triggered wave train anomalies and regulated zonal and meridional vapor transport across Eurasia. Generally, during the weak/negative WI phase, anticyclone anomalies centered over Mongolia may strongly reduce vapor output across the east boundaries, while cyclone anomalies centered over the northwest outside the TP likely enhance meridional vapor transport into the western TP from the south ocean. Eventually, precipitation over the arid and semi-arid TP increased significantly in the past four decades, that stimulated plant growth and greening pattern on the TP. Our results established the linkage among climate oscillations, regional climate alteration and vegetation greening, providing a more thorough understanding in terrestrial greening.

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