SONG Linlin, HAO Chengyuan, HE Sunan

(College of Surveying & Land Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract:In order to explore the spatial differentiation characteristics of precipitation in north and south of Qinling Mountains, data of daily precipitation of 22 meteorological stations in north and south of Qinling Mountain Ridge during 2011-2018 and the wind direction of global data assimilation system was collected to perform the spatial pattern analysis, water vapor trajectory tracking and water vapor source contribution rate calculation by means of co-Kriging interpolation and backward trajectory model of mixed single particle Lagrange integral diffusion transmission model. The results showed that the spatial pattern of the equal precipitation line in Qinling Mountains reflects the mountain water vapor barrier effect, while the spatial difference in the annual precipitation in the northern foot is small. The annual precipitation in the southern foot has the distribution characteristics of high-low-high from west to east, and the spatial variation is large. There are three main water vapor transport paths in Qinling Mountains: southwest water vapor from Indian Ocean Bay of Bengal, southeast water vapor from western Pacific Ocean, and northern polar continent water vapor from Mongolia-Siberia. In summer, the blocking effect of western Qinling Mountains on southwest water vapor is greater than that of eastern Qinling Mountains on southeast water vapor, while in autumn, the Indian Ocean water vapor transport basically has no effect on precipitation at the northern foot of the mountains, while the water vapor transport path in western Pacific Ocean only deviates eastward.

Key words:HYSPLIT model; spatial variation; water vapor trajectory tracking; contribution rate of water vapor source; mountain barrier effect; climatic boundary zone

EARTH AND ENVIRONMENT Vol.49, No.1, Tot No.344, 2021, Page 615-622