Characteristics of summer precipitation in Dongting Lake basin and analysis of atmospheric circulation in drought and flood years
Based on the monthly precipitation data and NCEP/NCAR reanalysis data of 96 meteorological stations in the Dongting Lake basin for 1961-2015 years, this paper analyzed the temporal and spatial variations of the summer precipitation in the Dongting Lake in 55 years and the characteristics of the atmospheric circulation in the typical summer flood years and summer drought years. The results showed that there are distinct interannual and interdecadal variabilities in summer precipitation in 55yr and there are quasi 3yr and 20yr cycles. The average summer precipitation in the basin had a spatial distribution characteristic of increase from the middle north plain to the surrounding mountainous area. From the situation of atmospheric circulation, water vapor transport, and convergence, the typical summer flood(drought) year corresponds to the large area of the subtropical high in the Northwest Pacific, the strong intensity, and the anomalous convergence of the water vapor above the river basin.
Dongting Lake basinsummer precipitationatmospheric circulationwater vapor transport
国家科技期刊平台
NSTL
万方数据
维普
