关键词: 长江流域, δ¹⁸O, 过量氘, 水汽来源

Abstract: Based on the monthly mean δD and δ¹⁸O data in precipitation in the Yangtze River Basin from GNIP and the NCEP/NCAR reanalysis data from the NOAA-CIRES, the relationships between stable isotopes in precipitation and precipitation amount, air pressure, temperature, moisture sources were analyzed in the Yangtze River Basin. The results indicate that the δ¹⁸O in precipitation is in the negative correlations with precipitation amount, air pressure and temperature in the Yangtze River Basin under the seasonal scale, and it suggests that the variations of δ¹⁸O in precipitation are of significant precipitation amount effect, humidity effect and anti-temperature effect. According to the principle exploring the moisture sources by deuterium excess in precipitation, the relationships between deuterium excess in precipitation and relative humidity in the Arabian Sea, the Bay of Bengal and the South Indian Ocean are analyzed, which suggests that the vapor mainly originates from three above-mentioned sea regions. However, deuterium excess in precipitation is in a positive phase relationship with the relative humidity of moisture sources areas in Kunming and Chengdu stations, which may be affected by other vapor sources.

Key words: The Yangtze River Basin, δ¹⁸O, Deuterium excess, Moisture sources