Trend of precipitation in China and its linkage with El Nino- Southern Oscillation (ENSO)

摘要

Plausible long-term trend of precipitation in China is detected by using Mann-Kendall test. The results show that the precipitation mainly increased in the western part of China and mainly decreased in the eastern part of China during the past five decades. The teleconnection between precipitation and El Nino-Southern Oscillation (ENSO) is investigated by using the Student's t-test and 62 stations were found to show a significant difference in precipitation between El Nino and La Nina episodes. Most of these stations are concentrated in the Yellow River basin and Shandong Province. It indicates that the impact of ENSO on precipitation in these regions is greater than that in other regions of China. Average precipitation during El Nino and La Nina episodes, and the entire periods are compared. The results show that La Nina generally coincides with wetter years and El Nino coincides with drier (wetter) years north (south) of the Yangtze River.