An analysis based on July-August precipitation reveals that there is a tripole pattern of the precipitation distribution, that is, significantly increased rainfall over North China (NC) is related to the increased rainfall over the Indian subcontinent (IS) and the decreased rainfall over the southeastern Tibetan Plateau (TP) and vice versa, that corresponds to the Indian summer monsoon (ISM) and TP heating pattern, which are interactive. Therefore, it is necessary to investigate the effect of NC rainfall-related atmospheric circulation and the physical linkage with the two thermal forcings together. The linear baroclinic model (LBM) is applied to determine the dynamics of the process. The results show that an enhanced ISM is accompanied by reduced TP heating, favors convection and easterly anomaly over the IS, and produces a Gill-type Rossby wave that affects the vorticity over North Africa. Meanwhile, there is another Rossby wave originating in North Africa and moving eastward to the Pacific Ocean, which interferes with circulation at mid- to high-latitudes, i.e., it strengthens the cyclone over the Baikal region and stretches the western Pacific subtropical high (WPSH) northward to northeastern Asia, and results in abundant water vapor transported to NC. Furthermore, the strong convection over the IS excites the Kelvin waves over the equatorial region, which moves eastward and generates anticyclones over Philippines, consequently leading to the Pacific-Japan (PJ) pattern. The PJ pattern cooperates with the wave train at midlatitudes, resulting in abundant water vapor being transported to NC. The summer rainfall over NC is therefore modulated by synergistic effect of both the ISM and TP heating.

中文翻译：

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印度夏季风和青藏高原加热对华北夏季降水的协同效应

基于7月至8月降水的分析表明，降水分布存在三重峰型，即华北（NC）的降雨量显着增加与印度次大陆（IS）的降雨量增加和印度次大陆（IS）的降雨量减少有关。青藏高原东南部（TP），反之亦然，这与印度夏季风（ISM）和TP加热模式是相互影响的。因此，有必要研究与NC降雨有关的大气环流的影响以及两个热强迫的物理联系。线性斜压模型（LBM）用于确定过程的动力学。结果表明，与IS相比，增强的ISM伴有TP热量降低，有利于对流和东风异常，并产生a型Rossby波，从而影响北非的涡度。同时，又有一个罗斯北波发源于北非并向东移动到太平洋，这干扰了中高纬度的环流，即，它增强了贝加尔湖地区的旋风并伸展了西太平洋副热带高压（WPSH）。 ）向北至东北亚，导致大量的水蒸气被输送到北卡罗来纳州。此外，国际空间站上的强对流激发了赤道地区的开尔文波，该开尔文波向东移动并在菲律宾上空产生反气旋，从而导致了日本-太平洋（PJ）模式。PJ模式与中纬度的波列配合，导致大量水蒸气被输送到NC。