Institute of Atmospheric Physics, Chinese Academy of Sciences
Changbai Mountains are located in the southeast of Jilin Province. Rainfall has a crucial impact on the forest ecosystem and water resource in Changbai Mountains, which is a national key ecological function area. Based on the monthly precipitation data from 47 stations in Jilin Province and ERA-Interim monthly reanalysis data from 1979 to 2016, we investigated the climate characteristics of the summer precipitation at Tianchi station in Changbai Mountains and circulation anomalies associated with the interannual variation of rainfall at this station, and compared with the other stations in Jilin Province. The results show that the summer precipitation at Tianchi and its interannual variability are approximately two times larger than other stations in Jilin Province. On the one hand, the circulation anomalies associated with interannual variability of precipitation at Tianchi are consistent with those for Jilin Province. The circulation anomalies that favor more rainfall at Tianchi and Jilin Province are characterized by a cyclonic anomaly over Northeast Asia and enhanced East Asian jet in June, and enhanced western Pacific subtropical high and northward displaced East Asian jet in July and August. On the other hand, the precipitation in Tianchi is associated with unique circulation anomalies, which are quite different or almost opposite to those related to the precipitation in Jilin Province rainfall, and may be attributed to by the terrain of Changbai Mountains. The present results suggest that the climate variability in mountains may be related to complicated and various patterns of large-scale atmospheric circulation anomalies.