Influences of Nino3 SST Rising in the Second Half Year on East Asia Spring General Circulation and Shandong Spring Precipitation

By analyzing next-spring abnormal features of 500 hPa height and 850 hPa, 200 hPa meridional wind due to Nino3 SST rising, it is found that Nino3 SST rising abnormally in the second half year leads to 500 hPa height field rising in the tropic and Northwest Pacific subtropical region, namely the Northwest Pacific subtropical high is stronger and shifts westwards and northwards compared with the mean, and the trough over East Asia is weaker with its location shifts eastwards; the height field falls from the area around Balkhash to Baikal Lake, i. e., trough often maintains; zonal circulation prevails over Asia and the Western Pacific; Southerly winds intensifies over east part of China and neighboring sea area. while northerly winds weaken over north China and the Northeast of China. The abnormal features of the height and meridional wind fields are uniform with that of much more April precipitation in Shandong. Result suggests that spring precipitation in Shandong and eastern China are often richer after Nino3 SST unusually increasing in the last second half year。