文章基本信息

标题：Comparing deuterium excess to large-scale precipitation recycling models in the tropics
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作者：Stephen Cropper ; Kurt Solander ; Brent D. Newman 等
期刊名称：npj Climate and Atmospheric Science
电子版ISSN：2397-3722
出版年度：2022
卷号：5
期号：1
页码：1-9
DOI：10.1038/s41612-021-00217-3
语种：English
出版社：Nature Publishing Group
摘要：Precipitation recycling is essential to sustaining regional ecosystems and water supplies, and it is impacted by land development and climate change. This is especially true in the tropics, where dense vegetation greatly influences recycling. Unfortunately, large-scale models of recycling often exhibit high uncertainty, complicating efforts to estimate recycling. Here, we examine how deuterium excess (d-excess), a stable-isotope quantity sensitive to recycling effects, acts as an observational proxy for recycling. While past studies have connected variability in d-excess to precipitation origins at local or regional scales, our study leverages >3000 precipitation isotope samples to quantitatively compare d-excess against three contemporary recycling models across the global tropics. Using rank-correlation, we find statistically significant agreement (\(\bar \tau = 0.52\) to \(0.70\)) between tropical d-excess and recycling that is strongly mediated by seasonal precipitation, vegetation density, and scale mismatch. Our results detail the complex relationship between d-excess and precipitation recycling, suggesting avenues for further investigation.