Influence of atmospheric circulation on the stable isotope of precipitation in the monsoon margin region

Abstract

Precipitation stable isotope is a good medium for studying the water cycle and atmospheric water vapor transport process. To better understand the influence and control mechanism of atmospheric circulation on the stable isotope of precipitation in the East Asian monsoon margin region. We set up observation points in the Shiyang River basin in the East Asian monsoon marginal region to observe precipitation isotopes and analyze the mechanism and process of the control of atmospheric circulation on precipitation isotopes in the monsoon marginal region. The results show that: The results show that the stable isotope of precipitation in the monsoon margin region is greatly affected by the local meteorological conditions, and there are obvious temperature effects. The main water vapor affecting the monsoon margin region throughout the year are west wind water vapor, southeast monsoon water vapor, plateau wind water vapor and local circulation water vapor. In July and August, 25.33% and 65% of the southeast monsoon water vapor reached the monsoon margin region, respectively. The variation of stable isotope of precipitation in the monsoon margin region is mainly controlled by the East Asian Monsoon and the Northwest Pacific Monsoon Trough, but is less dependent on the Westerly Wind and Plateau Wind.