In this study, the relationship between the East Asian subtropical westerly jet (EASWJ) and the East Asian summer monsoon (EASM) (westerly monsoon) and the correlation with the atmospheric heat source (AHS) on the Tibetan plateau (TP), especially the possible connection of the sudden enhancement of the correlation in August were analyzed. The results show that there is a significant correlation between the EASWJ and the EASM from June to October in terms of both intra-annual variability and interannual fluctuations, and the correlation between the AHS over TP and the EASWJ and the EASM during the same period is significantly enhanced in August. The synthetic analysis indicated that when the AHS was strong, a positive anomaly of a horizontal temperature gradient appeared over TP, which was conducive to the southward shift of the high-altitude temperature gradient center, resulting in the southward position of the axis of the 200 hPa westerly jet, and an upward and downward inclined westerly anomaly zone appeared from the south slope of TP to the main body and its north slope. Meanwhile, the East Asia–Pacific (EAP) teleconnection pattern with a negative phase appeared at 500 hPa, and TP to western Japan was located in the negative value area of the wave train. The AHS was conducive to the enhancement of the EAP negative phase, which was not conducive to the further northward transportation of water vapor by the EASM. On the contrary, when the AHS on TP was weak, the position of the westerly jet was northward and the EAP positive phase enhanced, contributing to the further northward transport of water vapor from the EASM.

中文翻译：

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8月青藏高原大气热源与西风-季风演变关系及其物理机制

本研究探讨东亚副热带西风急流（EASWJ）与东亚夏季风（EASM）（西风季风）的关系及其与青藏高原（TP）大气热源（AHS）的相关性，特别是分析了 8 月份相关性突然增强的可能联系。结果表明，6-10月EASWJ和EASM在年内变率和年际波动方面均存在显着相关性，同期AHS over TP与EASWJ和EASM的相关性为8月显着增强。综合分析表明，当AHS较强时，TP出现水平温度梯度正异常，有利于高空温度梯度中心南移，导致 200 hPa 西风急流轴线偏南，从 TP 南坡向主体及其北坡。同时，东亚太平洋（EAP）遥相关型在500 hPa处出现负相位，TP至日本西部位于波列的负值区。AHS有利于EAP负相增强，不利于EASM进一步向北输送水汽。反之，当高原AHS较弱时，西风急流位置偏北，EAP正相增强，有助于东亚夏季风水汽进一步向北输送。