 The Tibetan Plateau has experienced a moistening process since the late 1990s, except for the southern Tibetan Plateau where summer monsoon precipitation amount has decreased and lakes have shrunk. The cause of this decrease is not clear yet. The monsoon precipitation changes in the southern Tibetan Plateau from 1979 to 2018 feature a Decadal variation component with a peak of around 10 years that is superposed on an upward trend from 1979 to 1998 and a downward trend afterward. The Decadal variation of the southern Tibetan Plateau precipitation is associated with a large-scale dipolar sea surface temperature pattern between the equatorial central pacific and the Indo-Pacific warm pool. A wet southern Tibetan Plateau corresponds to negative SST anomaly in the equatorial central pacific and positive SST anomaly in the Indo-Pacific warm pool. This equatorial SST gradient in the western pacific generates pronounced easterly anomalies and a dipolar rainfall anomaly, with a positive rainfall anomaly over the maritime continent and a negative anomaly in the equatorial western and central pacific. The suppressed heat source excites an anomalous anticyclonic band along 15 to 20 degrees N extending from the Philippine Sea to the Bay of Bengal by emanating westward propagating descending transient waspy waves. The low-level anticyclonic circulation over the Bay of Bengal further enhances northward moisture transport toward the southern Tibetan Plateau and promotes upward motion in the southern Tibetan Plateau through changing local meridional circulation. Additionally, linearized atmospheric general circulation model experiments demonstrate that the dipole heating source can generate a high-pressure zone under the control of anticyclone over the western pacific, which can extend westward to the Indian Mansun region. This article was authored by CUU, Bin Wang, Kuwen Yang, and others. We are article.tv, links in the description below.