Remarkable climate anomalies occurred in Europe in recent years, but the reasons are not entirely disclosed. This entails further exploring the physical mechanism of anomalous climate variability over Europe on the basis of previous studies. Using NCEP-NCAR reanalysis and CMAP precipitation datasets, we investigated the relationship between the thermal condition of the Tibetan Plateau (TP) and precipitation over Europe during summer and related mechanisms behind through observational analyses and simulation experiments. The results show that the summer TP surface air temperature (SAT) is significantly correlated with the simultaneous precipitation over the region from eastern Ukraine to the North Caucasus (EUNC; 43°–51° N, 34°–46° E) during the period 1979–2017. The effect of anomalous TP heating plays, to some extent, an active role in linking the summer TP SAT with EUNC precipitation. The variability of the TP SAT is a result of the anomalous TP heating, but it can reflect the variability in temperature of a thick tropospheric air column over the TP well. Corresponding to higher (lower) TP SAT, the higher (lower) temperature anomaly appears over the TP and extends westwards through the transport of anomalous temperature fluxes from the TP to the EUNC regions in the upper troposphere, resulting in the expansion (withdrawal) of the South Asian high (SAH) and associated less (more) precipitation over the EUNC region. Numerical simulations basically reproduce the above-mentioned physical process, which confirms that, through stimulating the variability of upper-tropospheric temperatures over the TP and a larger area to its west and associated upstream large-scale atmospheric circulation, the summer TP’s thermal condition can modulate and expand the impact of the SAH to the EUNC region and therefore affect the concurrent precipitation in situ. This study implies an importance of the thermal anomaly of the TP to the variability of EUNC precipitation during summer.

近年来，欧洲出现了明显的气候异常，但原因尚未完全揭露。这需要在先前的研究基础上进一步探索欧洲异常气候变化的物理机制。利用NCEP-NCAR再分析和CMAP降水数据集，我们通过观测分析和模拟实验研究了青藏高原（TP）的热状况与欧洲夏季降水之间的关系以及相关的背后机制。结果表明，夏季TP地面气温（SAT）与乌克兰东部至北高加索地区（EUNC； 43°–51°N，34°–46°E）期间的同期降水量显着相关。 1979年至2017年。TP加热异常的影响在某种程度上起到了 在将夏季TP SAT与EUNC降水联系起来方面发挥了积极作用。TP SAT的变化是TP加热异常的结果，但它可以反映TP井上方厚的对流层空气柱的温度变化。对应于较高（较低）的TP SAT，较高（较低）的温度异常出现在TP上，并通过异常温度通量从TP到对流层上层EUNC区域的传输向西延伸，从而导致TP的扩展（退出）。南亚高（SAH）以及与之相关的EUNC地区降水减少（更多）。数值模拟基本上重现了上述物理过程，这证实了，通过刺激TP上空的对流层上方温度的变化以及其西部较大的区域以及相关的上游大规模大气环流，夏季TP的热状况可以调节和扩大SAH对EUNC区域的影响，从而影响同时原位降水。这项研究表明，TP的热异常对夏季EUNC降水变化的重要性。