HAO Chengyuan, FAN Songke

(College of Surveying & Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

 

Abstract: In this study the interaction region influenced possibly by both Southwest Moisture and South Sea Moisture is the research target, by means of stable isotope ratio mass spectrometer MAT253, hydrogen and oxygen stable isotopes of 239 effective samples in 16 samples atmospheric precipitation in the region between 23-24°N from Yunnan and Guangxi Provinces during April to October 2014 were analyzed. Spatial pattern study on δD and δ18O based on ArcGIS13.0 software by trend analysis were referenced, and boundaries between the moisture from Southwest and the moisture from South Sea were demarcated. There are three main results from this study. First of all, spatial patterns of both δD and δ18O are consistent basically both in the whole rainy season precipitation and a precipitation course during the middle ten days and the last ten days of June, because both δD and δ18O of the atmospheric precipitation are diminishing along the water vapor transmission path. Secondly, both rainfall factor and continental factor have affected the spatial pattern of hydrogen and oxygen stable isotopes in atmospheric precipitation of the study area, but the barrier of huge mountains may be its main cause of value mutating, such as the Ailao Mountain and the Wuliang Mountain. Thirdly, after crossing the Ailao Mountain, the southwest vapor met the South Sea vapor near Honghe, Gejiu and Mengzi both in the whole rainy season precipitation and a precipitation course during the middle ten days and the last ten days of June, so the area near Honghe, Gejiu and Mengzi is probably the region with Southwest vapor and South Sea vapor interaction.

Key words: hydrogen and oxygen isotopes; southwest moisture; south sea moisture; interaction region; atmospheric precipitation; stable isotopic technique

EARTH AND ENVIRONMENT Vol.45, No.5, Tot No.319, 2017, Page 508-514