Abstract In this study, the heat source effect of the Tibetan Plateau (TP) on the India-Burma Trough (IBT) is investigated with multi-layer soil temperatures. Because the significantly positive correlation between the soil temperatures at 10 cm (Tsoil−10) and the India-Burma Trough intensity index (IBTI) lasts from October to the following February, the Tsoil−10 of TP is selected as the heat source index (HSI). Our composite analysis showed that, when the HSI of TP in the cold season decreases, the subtropical jet moves downward. As a result, the south branch of the westerlies on the south side of the TP is enhanced and the IBT deepens. The upward motion in front of the trough is enhanced, resulting in convergence of a large amount of moisture and a steady vapor transport to Southwest and South China. Conversely, when the HSI strengthens, the subtropical jet moves upwards and the IBT weakens. Meanwhile, the northern branch of the westerlies intensifies, suppressing the moisture convergence and transportation in front of IBT.

中文翻译：

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青藏高原冬季印缅海槽热源效应研究

摘要 本研究利用多层土壤温度研究了青藏高原（TP）对印缅海槽（IBT）的热源效应。由于10 cm处土壤温度（Tsoil-10）与印缅海槽强度指数（IBTI）呈显着正相关，持续时间为10月至次年2月，故选取青藏高原的Tsoil-10作为热源指数（恒指）。我们的综合分析表明，当冷季青藏高原HSI下降时，副热带急流向下移动。因此，青藏高原南侧西风带南支增强，IBT加深。槽前的上升运动增强，导致大量水分汇聚，向西南和华南稳定输送水汽。相反，当恒指走强时，副热带急流向上移动，IBT减弱。同时，西风带北支加强，抑制了IBT前方的湿气汇聚和输送。