Cintra Bruno B L, Gloor Emanuel, Baker Jessica C A, Boom Arnoud, Schöngart Jochen, Clerici Santiago, Pattnayak Kanhu, Brienen Roel J W
School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK.
School of Geography, University of Leeds, Leeds, UK.
Commun Earth Environ. 2025;6(1):453. doi: 10.1038/s43247-025-02408-9. Epub 2025 Jun 17.
Over recent decades the Amazon region has been exposed to large-scale land-use changes and global warming. How these changes affect Amazonia's hydrological cycle remains unclear as meteorological data are scarce. We use tree ring oxygen isotope records to confirm that the Amazon hydrological cycle has intensified since 1980. Diverging isotopic trends from terra firme and floodplain trees from distinct sites (approximately 1000 km apart) in Western Amazon indicate rainfall amounts increased during the wet season and decreased during the dry season at large-scale. Using the Rayleigh distillation model, we estimate that wet season rainfall increased by 15-22%, and dry season rainfall decreased by 8-13%. These diverging trends provide evidence, independent from existing climate records, that the seasonality of the hydrological cycle in the Amazon is increasing. Continuation of the observed trends will have a pervasive impact on Amazon forests and floodplain ecosystems, and strongly affect the livelihoods of the regional riverine communities.
在最近几十年里，亚马逊地区经历了大规模的土地利用变化和全球变暖。由于气象数据稀缺，这些变化如何影响亚马逊地区的水文循环仍不清楚。我们利用树木年轮氧同位素记录来证实，自1980年以来亚马逊水文循环已经加剧。来自亚马逊西部不同地点（相距约1000公里）的高地和洪泛区树木的同位素趋势不同，表明大规模上雨季降雨量增加，旱季降雨量减少。使用瑞利蒸馏模型，我们估计雨季降雨量增加了15%-22%，旱季降雨量减少了8%-13%。这些不同的趋势提供了独立于现有气候记录的证据，表明亚马逊地区水文循环的季节性正在增强。观测到的趋势持续下去将对亚马逊森林和洪泛区生态系统产生普遍影响，并强烈影响该地区河岸社区的生计。
