This study focuses on the primary synoptic-scale patterns and precursors of extreme and non-extreme precipitation over the Tibetan Plateau (TP). Atmospheric circulation anomalies and their precursors associated with regional extreme precipitation events (REPE) demonstrate distinct precursor wave train and heightened intensity than regional non-extreme precipitation events (non-REPE). Specifically, REPE over the northwestern TP (NWTP) exhibits a geopotential height anomaly induced by a latitudinal propagating Rossby wave train along 40°N. In contrast, over the southeastern TP (SETP), REPE is characterized by a geopotential height anomaly caused by a northwest-southeastward propagating Rossby wave train. The ascending motion anomalies of REPE over both NWTP and SETP are primarily attributed to the geostrophic zonal temperature advection, which is significantly stronger during REPE compared to non-REPE. This finding provides valuable insights for forecasting summer extreme precipitation over TP.

中文翻译：

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青藏高原夏季极端降水与非极端降水有什么区别？


本研究侧重于青藏高原 （TP） 极端和非极端降水的主要天气尺度模式和前兆。与区域性非极端降水事件 （non-REPE） 相比，与区域性极端降水事件 （REPE） 相关的大气环流异常及其前兆表现出不同的前兆波序列和更高的强度。具体来说，西北 TP （NWTP） 上的 REPE 表现出由沿 40°N 传播的纬度传播的 Rossby 波列引起的位势高度异常。 相比之下，在东南 TP （SETP） 上，REPE 的特征是由西北-东南方向传播的罗斯比波列引起的位势高度异常。REPE 在 NWTP 和 SETP 上的上升运动异常主要归因于地转纬向温度平流，与非 REPE 相比，REPE 期间的地转温度平流明显更强。这一发现为预测 TP 上的夏季极端降水提供了有价值的见解。