Regional hydrological cycle responding to rising temperatures can have significant influences on society and human activities. We suggest a new perspective on East Asia’s enhanced precipitation amount that emphasizes the role of Siberian surface warming. Increased vegetation greenness in late spring and early summer in eastern Siberia, which may be a response to global warming, acts to warm the surface by reducing the surface albedo with an increase in net absorbed shortwave radiation. Subsequently, eastern Siberia warming leads to the strengthening of anti-cyclonic atmospheric circulation over inner East Asia as well as the subtropical western North Pacific high via thermal forcing and the enhanced land-sea thermal contrast, respectively. Consequently, the anticyclonic circulation over inner East Asia transports much drier and cooler air to southern East Asia. This leads to favorable conditions for increased precipitation in combination with an increased tropical moisture flux from the subtropical western North Pacific high. Therefore, continuous Siberian vegetation growth has a potential influence on the future precipitation amount in the subtropics through vegetation–atmosphere coupled processes.

区域水文循环对气温上升的响应可能对社会和人类活动产生重大影响。我们提出了关于东亚降水量增加的新视角，强调西伯利亚地表变暖的作用。西伯利亚东部春末夏初植被绿度增加，这可能是对全球变暖的反应，通过减少地表反照率和净吸收短波辐射的增加来使地表变暖。随后，东西伯利亚变暖分别通过热强迫和陆海热力对比增强，导致东亚内陆和副热带西北太平洋高压的反气旋性大气环流加强。因此，东亚内陆的反气旋环流将更加干燥和凉爽的空气输送到东亚南部。这为降水增加以及来自副热带西北太平洋高压的热带湿气通量增加创造了有利条件。因此，西伯利亚植被的持续生长通过植被-大气耦合过程对亚热带地区未来的降水量产生潜在影响。