Characteristics of δ17O excess in Precipitation and Its Environmental Significance in Shanghai

Authors: Luan Zhang*, East China Normal University, Limin Zhou, East China Normal University
Topics: Global Change, Climatology and Meteorology, Environment
Keywords: Shanghai; hydrogen and oxygen isotope; the Meteoric Water Line( MWL) ; deuterium excess; δ17O excess
Session Type: Paper
Day: 4/4/2019
Start / End Time: 5:00 PM / 6:40 PM
Room: Buchanan, Marriott, Mezzanine Level
Presentation File: No File Uploaded

Based on the atmospheric precipitation samples which collected during September 2016 to August 2016 in Shanghai, we measure and analyze the composition characteristics of Oxygen and Hydrogen isotope, explore the environmental significance of deuterium excess and δ17O excess. The results showed that the isotope ratio of precipitation changes obviously in a year. It was higher in winter and spring, and lower in summer and autumn. And the isotope ratio of precipitation was decreasing during a single precipitation process. The correlation between δ18O and environmental factors shows the weak precipitation effect and anti-temperature effect. The Meteoric Water Line and deuterium excess found that the climate in Shanghai is moderate and moist overall, and evaporation is small relatively. And relative humidity of water vapor sources is lower in winter half year, and higher in summer half year. Comprehensive analysis of the δ17O excess, reveals that water vapor of precipitation in Shanghai is from the sea to the land transfer process, and in the process of migration was along the land surface evaporation. The source of water vapor in the rainy season is the marine air mass, in dry season is inland which mainly local evaporation.

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