亚马逊森林巨大的蒸腾能力显著改变了其上空的水汽含量，近期的研究表明，这种加湿作用是亚马逊从干季转为湿季的主要推动力。

相关研究论文“Rainforest-initiated wet season onset over the southern Amazon”已经发表在PNAS上。

链接：http://www.pnas.org/content/114/32/8481.long

值得一提的是，本研究的第一作者Jonathon S. Wright（http://www.cess.tsinghua.edu.cn/publish/ess/7687/2012/20120619141317866273695/20120619141317866273695_.html）系清华大学地球系统科学系的副教授。

Abstract

Although it is well established that transpiration contributes much of the water for rainfall over Amazonia, it remains unclear whether transpiration helps to drive or merely responds to the seasonal cycle of rainfall. Here, we use multiple independent satellite datasets to show that rainforest transpiration enables an increase of shallow convection that moistens and destabilizes the atmosphere during the initial stages of the dry-to-wet season transition. This shallow convection moisture pump (SCMP) preconditions the atmosphere at the regional scale for a rapid increase in rain-bearing deep convection, which in turn drives moisture convergence and wet season onset 2-3 mo before the arrival of the Intertropical Convergence Zone (ITCZ). Aerosols produced by late dry season biomass burning may alter the efficiency of the SCMP. Our results highlight the mechanisms by which interactions among land surface processes, atmospheric convection, and biomass burning may alter the timing of wet season onset and provide amechanistic framework for understanding how deforestation extends the dry season and enhances regional vulnerability to drought.