Impacts of sequential typhoons on sea surface temperature and sea surface height in September 2008

The spatio-temporal variations of sea surface temperature(SST) and sea surface height anomaly(SSHA) induced by three sequential typhoons in September 2008 were investigated by using multi-satellite data.Possible factors influence SST and SSHA variations were discussed.The typhoon-induced strong upwelling(1×10-5-150×10-5m/s) caused extreme sea surface cooling(1-6 ℃) and significant SSHA decrease(10-50 cm).Besides,the typhoon-induced maximum SST cooling centers were closely associated with negative sea surface height(or mesoscale eddy) area.Furthermore,the results provide convincible evidences that the typhoon translation speed(or forcing time),typhoon intensity and pre-existing cold eddy may play important roles in this process.A cyclonic eddy emerged in the pre-existing positive SSHA area due to the three sequential typhoons forced jointly.This study implies that some typhoons,e.g.,sequential typhoons passing over the same area,may play a notable role in ocean mesoscale eddies generating processes.