【摘要】 利用多卫星观测资料,分析了2008年9月3个连续台风前后的海表温度(SST)和海表高度距平(SSHA)的时空变化特征,并探讨了影响其变化的主要因子。结果表明:(1)3个台风引起了强烈的上升流(1×10-5～150×10-5 m/s),海表显著降温(1～6℃),海表高度也有不同程度降低(10～50cm);(2)台风引起的SST最大降温中心与SSHA负值或中尺度冷涡的区域中心十分吻合,同时台风使得先前存在的海洋中尺度冷涡得到加强;(3)同一区域台风对SST影响程度大小受台风的强度、移动速度以及台风对海面强迫时间等因素控制;(4)在原先SSHA为正值的海域,3个台风连续强迫下使得局地洋面形成一个SSHA为负值的中尺度涡,这与单一"打转"台风强迫海洋生成中尺度涡的现象不同。因此,对于西北太平洋海域而言,频发的台风在中尺度涡生消演变过程中的影响应不容忽视。更多还原

【Abstract】 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.更多还原