期刊
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
卷 53, 期 5, 页码 518-538出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10256016.2017.1305376
关键词
Brazilian climate; deuterium excess; hydrogen-2; isotope hydrology; multiple regression model; oxygen-18; precipitation
资金
- International Atomic Energy Agency [CRP-19747]
- Pro Reitoria de Pesquisa - Univ. Est. Paulista (Primeiros Projetos - PROPE)
- FAPESP [2013/06704-0]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [142070/2013-0]
Based on Global Network Isotopes in Precipitation (GNIP) isotopic data set, a review of the spatial and temporal variability of delta O-18 and delta H-2 in precipitation was conducted throughout central and eastern Brazil, indicating that dynamic interactions between Intertropical and South Atlantic Convergence Zones, Amazon rainforest, and Atlantic Ocean determine the variations on the isotopic composition of precipitation over this area. Despite the seasonality and latitude effects observed, a fair correlation with precipitation amount was found. In addition, Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) air mass back trajectories were used to quantify the factors controlling daily variability in stable isotopes in precipitation. Through a linear multiple regression analysis, it was observed that temporal variations were consistent with the meteorological parameters derived from HYSPLIT, particularly precipitation amount along the trajectory and mix depth, but are not dependent on vapour residence time in the atmosphere. These findings also indicate the importance of convective systems to control the isotopic composition of precipitation in tropical and subtropical regions.
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