Abstract
In monsoonal areas, the ocean transports water vapor to inland areas and affects the stable isotopes of precipitation in inland areas, leading to that stable isotopes of precipitation could be used as a medium to study large-scale water vapor cycles. Analysis of the characteristics of δ18O and δ2H indicates that stable isotopes of precipitation in the Shiyang River Basin (SRB) exhibit obvious seasonal changes. The slope and intercept of the local meteoric water line (LMWL) in summer and autumn are lower than those in spring and winter, which is similar to the typical monsoon climate zone, indicating that large-scale monsoon water vapor is the main source of precipitation in the SRB. Regional-scale (equatorial North Pacific) cloud cover and outgoing longwave radiation (OLR) have a stronger impact on the East Asian monsoon edge area, there is a significant negative correlation between cloud cover in the equatorial North Pacific and precipitation stable isotopes in the SRB, and there is a positive correlation between OLR in the equatorial North Pacific and precipitation stable isotopes in the SRB. The cloud cover on the fifth day before precipitation in the equatorial North Pacific has the greatest impact on precipitationδ18O in the SRB. In the region with the highest correlation coefficient (the equatorial North Pacific), the correlation between precipitation δ18O and high cloud cover is greater than that between precipitation δ18O and medium cloud cover or low cloud cover, indicating that cloud cover has the most significant influence on precipitation stable isotopes in the middle troposphere (3–8 km).
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