Analysis on Climate Anomalies in China in Summer 2014
In summer 2014, the surface air temperature averaged over China was 21.1℃, which is 0.2℃ above normal. The mean precipitation over China was 320.1 mm, which was less than normal by 1.6%, and its spatial distribution shows the significant feature of less in the north but more in the south. The average rainfall over the Huanghe River and Huaihe River region was minimum in historic records tied for the same period in 1999. Further analysis on the summer rainfall anomaly shows that the summer precipitation anomaly in China is because the East Asian summer monsoon was weaker and the Northwest Pacific subtropical high was stronger and further southward than normal. Warm Indian Ocean SST and the El Nino condition jointly resulted in continued stronger and southward Northwest Pacific subtropical high. The two parts were important external forcing conditions for abnormal rainfall.