The precipitation that falls on the continents defines the extent and nature of terrestrial ecosystems and human activity in them, all of which are adapted to and maintained by present-day precipitation. In essence, precipitation is supplied by moisture that either comes directly from the ocean, or is subsequently recycled from the continents themselves. Both the processes that control evaporation and the main mechanisms of moisture transport clearly differ between the ocean and the continent, thus within the context of a changing climate, it may be expected that the relationship between precipitation of oceanic and terrestrial origin varies globally and regionally, as will the influence of these two basic components of total precipitation on global and regional precipitation trends, especially in tropical regions. We describe an approach based on a Lagrangian technique for estimating the precipitation in a target region given the proportions of moisture transported from the two sources (ocean and continent) to reveal that the percentage of precipitation of oceanic origin has increased globally in the current climate (1980–2016). The greatest observed rate of increase is in the tropical regions; furthermore, the trends of precipitation in these regions are controlled by trends in precipitation for which the source of moisture is the ocean.

大陆上的降水决定了陆地生态系统和人类活动的程度和性质，所有这些都适应和维持了当今的降水。本质上，降水是由直接来自海洋的水分提供的，或者是随后从各大洲本身回收的水分提供的。在海洋和大陆之间，控制蒸发的过程和主要的水分传输机制显然是不同的，因此，在气候变化的背景下，可以预期，全球和区域性海洋和陆地来源的降水之间的关系会有所不同，总降水量的这两个基本组成部分对全球和区域降水趋势的影响，特别是在热带地区。我们描述了一种基于拉格朗日技术的方法，根据两种来源（海洋和大洲）输送的水分比例，估算了目标区域的降水量，从而揭示了在当前气候下全球海洋降水的百分比已经增加（ 1980–2016）。观察到的最大增长率是在热带地区。此外，这些地区的降水趋势受海洋水汽来源的降水趋势控制。观察到的最大增长率是在热带地区。此外，这些地区的降水趋势受海洋水汽来源的降水趋势控制。观察到的最大增长率是在热带地区。此外，这些地区的降水趋势受海洋水汽来源的降水趋势控制。