General Circulation over the Northern Hemispherein 2002 and Its Impact on the Climate in China
General circulation features over the Northern Hemisphere in 2002 are analyzed. It′s shown that a new El Nino event happened in late spring early summer. The subtropical high at 500hPa over the western Pacific was stronger than normal in 2002. In the summer, the 500hPa geopotential height anomaly was positive in Eurasia, and the positive center was over Lake Baikal, and the blocking high appeared over Lake Baikal in July. The East Asian summer monsoon was stronger than normal, and the South Asian summer monsoon and tropical convection index in summer were weaker than normal. All the features would exert a significant impact on the weather and climate in China in 2002, especially in summer.