DOI码：10.1073/pnas.1621516114
发表刊物：Proceedings of the National Academy of Sciences USA
摘要：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 a mechanistic framework for understanding how deforestation extends the dry season and enhances regional vulnerability to drought.
备注：Wright, J. S., R. Fu, J. Worden, S. Chakraborty, N. Clinton, C. Risi, Y. Sun and L. Yin
论文类型：期刊论文
学科门类：理学
一级学科：大气科学
卷号：114
期号：32
页面范围：8481-8486
是否译文：否
收录刊物：SCI
发布期刊链接：https://doi.org/10.1073/pnas.1621516114