1. Characteristics of hydrogen and oxygen isotopes in precipitation and moisture sources in Gaoyou, Jiangsu Province, China.
- Author
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SUI Ming-zhen, GAO De-qiang, XU Qing, HE Dong-mei, WANG Lei, and WANG Ting
- Abstract
It is necessary to examine the characteristics of hydrological cycle in Gaoyou area of Jiangsu Province in response to climate change and Hood disasters. In this study, 121 atmospheric rain samples were collected and environmental factors were recorded from July 2015 to October 2017. We analyzed the hydrogen and oxygen stable isotopic composition of rain and identify moisture sources in this area. Results showed that the hydrogen and oxygen isotopic composition of rain had an seasonal variation, which was positive in the winter but negative in the summer. D-excess value was higher in winter than that in summer. On the annual scale, significantly negative relationships between δD (δ
18 ) and temperature and between δD (δ18 O) and precipitation indicated the " anti-temperature effect" and "precipitation amount effect", respectively. On the seasonal scale, there was no obvious " temperature effect" but " precipitation amount effect" in autumn and winter. Results from the HYSPLIT model showed that the precipitation in this area came mainly from ocean evaporation that was influenced by the Chinese South Sea, Indian Ocean and Pacific Ocean. Precipitation in other seasons mainly came from the water vapor mixture from the Eurasian continent, Atlantic Ocean, Arctic Ocean, as well as local evaporation. The seasonal pattern of δD and δ18 O values in precipitation was mainly influenced by monsoon activity and El Nino-Southern Oscillation ( ENSO). In addition, the precipitation isotopes clearly indicated the shift in climates from El Nino to La Nina. [ABSTRACT FROM AUTHOR]- Published
- 2019
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