The relationship Between Northern Hemisphere (NH) spring sea ice area and concentration anomalies and the East Asian summer monsoon (EASM) anomalous was examined with statistics analysis of observation and modeling experiments. The results show that a negative spring sea ice area index of Northern Hemisphere corresponds to a positive Lau et al. (2000) East Asian summer monsoon index and an enhancement of summer rainfall in northeastern China and in the belt including Indo–China Peninsula, China south sea, Philippines and East of Guam. Meanwhile the rainfalls over Meiyu–Changma–Baiu belt significantly decrease. Anomalous in the 500hPa geopotential height derived from NCEP–NCAR reanalysis data and model output in the light spring sea ice case show an anomalous low over Indo–China Peninsula, China south sea, Philippines and central North Pacific in summer. A strong East Asian summer westerly jet and westerly wind shear between 20N–30N over East Asia and its associated wind file in whole troposphere can also support this relationship well. North Pacific SST and air-sea interaction is likely to be an important role in this interseasonal linkage between the Northern Hemisphere spring sea ice and the East Asian summer rainfalls. In spring, the decrease of NH sea ice mainly in Okhotsk and Barents Sea leads to an anomalous atmospheric cyclone and anticyclone in extra–tropic and tropic North Pacific. This pattern of atmospheric anomalous will lead to a warmer sea surface temperature (SST) over central Northwest Pacific; in turn the anomalous this pattern of SST will enhance the anomalous cyclone. Through this positive feedback process, the North Pacific SST acts as a “bridge” linking the NH spring sea ice anomalous and the East Asian summer monsoon.
