资源环境科技发展态势分析平台

Using Lagrangian moisture tracking methodology for 37-year reanalysis data, this study presents a quantitative climatology of remote moisture sources for 6-hourly summer precipitation over the southeastern Tibetan Plateau (SETP) during the boreal summer for the 1980-2016 period. The connections between moisture sources and regional-scale precipitation intensity are also explored. Different from previous viewpoints, this study finds that the terrestrial and oceanic sources contribute approximately 70% and 30% to the moisture supply for the summer precipitation over the SETP, with the Indian continent and Arabian Sea acting as the most important providers, respectively. Enhanced regional-scale precipitation, particularly for extreme events, can largely be further attributed to the increased moisture uptake originating from these two predominant sources with transport time scales of 2-5 days prior to the onset of precipitation. The intensified precipitation events are more likely to be associated with the enhanced water vapor transport conveyed by the large-scale atmospheric circulations, together with the land evaporation over the remote source regions.