中国季风边缘区夏季降水的时空变化及其响应

In this paper, based on MATLAB and ArcMap, using meteorological station precipitation data and NCEP / NCAR monthly reanalysis data, the typical temporal and spatial distribution patterns of summer precipitation in the northern monsoon marginal area of China during 1961-2015 and the resulting atmospheric circulation are analyzed by EOF analysis and Pearson correlation analysis. The results show that the summer precipitation in this area mainly presents two types of distribution: "consistent in the area" and "reverse in the area". Under the "consistent in the area" mode, the summer precipitation in the study area shows a consistent increase and decrease trend and generally shows a decreasing trend. Its formation is related to the same-phase configuration of the East Asia-Pacific teleconnection type (EAP) and the Eurasian teleconnection type (EU). Under the "reverse in the area" mode, the summer precipitation in the study area showed a reverse increase and decrease trend in the northeast-southwestern region and the interdecadal fluctuations changed in three stages. Its formation is related to the blocking high pressure of the Okhotsk Sea and the northeast cold vortex.