Review: Studies and Applications of Stable Isotopes in Precipitation

Abstract

This paper reviews observation- and model-based studies of stable isotopes in precipitation and discusses the Global Network for Isotopes in Precipitation (GNIP) and other regional networks and projects involving isotope observations. Using data from the latest GNIP/Isotope Hydrology Information System (ISOHIS) database, the annual and monthly variabilities of δD–δ18 temperature effect, and the amount effect for δ18 O relationships, the the Northern Hemisphere, Southern Hemisphere, and globe. At the global scale, the global Meteoric Water Line (MWL) was δD = 8.00 × δ18 the temperature effect was 0.53‰/ºC (R2 effect was –1.05‰/100 mm (R2 O were calculated as averages for O + 9.62 (R2 = 0.71), and the precipitation amount = 0.20). Comparisons of modeled and observed temperature and amount effects indicate that most General Circulation Models (GCMs) have reproduced the present climate well. This paper also summarizes the use of stable isotopes in precipitation as proxy data for climate variability and water origins, as well as the results of recent isotope-observation studies, especially in the Asian monsoon regions.