Abstract
The stable isotopes of oxygen and hydrogen in the water cycle have become a significant tool to study run-off formation, hydrograph separation, and the origin of precipitation. Precipitation assessment based on isotopic data has a potential implication for moisture sources. In the study, δD and δ18O of precipitation samples collected from six rainfall events were analyzed for stable isotope composition to provide implication of isotopic characteristics as well as moisture sources in Hemuqiao basin within Lake Tai drainage basin, eastern China. In these events, stable oxygen and hydrogen isotopic composition of precipitation had strong variations. Models of the meteoric water line and deuterium excess for different rainfall types (typhoon and plum rain, which is caused by precipitation along a persistent stationary front known as the Meiyu front for nearly two months during the late spring and early summer between eastern Russia, China, Taiwan, Korea and Japan) were established. Compared with plum rain, the moisture source of typhoon events had higher relative humidity and temperature. Moisture transport pathways were traced using the Hybrid Single-Particle Lagrangian Integrated Trajectory Model (HYSPLIT Model, developed by NOAA, Washington DC, U.S.) to verify the linkage with isotopic composition and moisture source. The moisture sources of typhoon events mostly derived from tropical ocean air with higher isotopic value, while that of plum rain events came from near-source local air with lower isotopic value.
Highlights
Oxygen and hydrogen isotopes in hydrological cycle have been utilized for many years.The International Atomic Energy Agency (IAEA) cooperated with the World MeteorologicalOrganization (WMO) accomplishing a worldwide program named Global Network of Isotopes in Precipitation (GNIP) to research the isotopic composition in precipitation since 1958
Equilibrium fractionation and kinetic fractionation exist in isotopes, i.e., there is a difference in precipitation at different times
In order to study the isotopic values of precipitation, we observed hydrological data both in typhoon events and plum rain events, considering the comparison of different rainfall types
Summary
Oxygen and hydrogen isotopes in hydrological cycle have been utilized for many years.The International Atomic Energy Agency (IAEA) cooperated with the World MeteorologicalOrganization (WMO) accomplishing a worldwide program named Global Network of Isotopes in Precipitation (GNIP) to research the isotopic composition in precipitation since 1958. This study will improve the knowledge of isotopic composition in precipitation and its moisture source in a typical basin, eastern China. Many studies have been conducted on spatial and temporal variation in precipitation using stable isotope concentrations (δ2 H and δ18 O) [4,5,6]. These can be applied to show the information of run-off formation, moisture source, and paleoclimate interpretation [7,8]. Previous studies have indicated that the main factors affecting the stable isotope in precipitation include moisture source, temperature, continental effect, and amount [9,10,11,12,13]. Δ18 O values of precipitation with temperature and latitude partly reflected geographical influences and long-term temperature changes [16]
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