QianJia Xie, Xiaojing Jia, Xinhai Chen. 2024: Impacts of Tibetan Plateau snow cover on the interannual variation in spring precipitation over the Tarim Basin. Adv. Atmos. Sci., https://doi.org/10.1007/s00376-024-4093-y
Citation: QianJia Xie, Xiaojing Jia, Xinhai Chen. 2024: Impacts of Tibetan Plateau snow cover on the interannual variation in spring precipitation over the Tarim Basin. Adv. Atmos. Sci., https://doi.org/10.1007/s00376-024-4093-y

Impacts of Tibetan Plateau snow cover on the interannual variation in spring precipitation over the Tarim Basin

  • This study investigated the impacts of Tibetan Plateau (TP) snow cover on the interannual variation in spring precipitation over the Tarim Basin (SPTB) for the period 1980-2019. Significant anomalies in westerly winds, associated with a low-pressure anomaly in the northern Tarim Basin and a high-pressure anomaly in the southwestern basin, enhance moisture conveyance from upstream areas to the inland, thereby promoting increased SPTB. The analysis shows that anomalous snow over the northwestern and central-western TP, persisting from winter to spring, has a close relationship with SPTB variation. A localized energy budget analysis reveals that increased winter TP snow induces a cooling effect on the overlying atmosphere, resulting in an abnormal low-pressure system prevailing over the troposphere above the western TP. This anomalous low-pressure system can persist into the subsequent spring facilitated by the local snow-atmosphere feedback effects and energy conversion from the background flow. This persistence is accompanied by upward motion and moisture convergence, ultimately enhancing the SPTB. Further analysis indicates that anomalous warming in the Indian Ocean sea surface temperature (SST) during winter intensifies the subtropical high, facilitating the uplift and transport of warm moisture from lower latitude oceans to middle latitudes, thereby contributing to the increased TP snow and SPTB. Importantly, the impact of TP snow on SPTB is primarily independent of anomalous Indian Ocean SST in the northern Tarim Basin. This study elucidates a complex mechanism of ocean-land-atmosphere interaction, enhancing our understanding of SPTB variation and highlighting the significant role of TP snow in this process.
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