The ocean surface currents are reconstructed from the satellite remote sensing data containing altimeter-derived sea surface height and QuikSCAT satellite-derived wind data. Based on the method proposed by Lagerloef, a global weekly 0.5°×0.5°ocean surface current product was obtained over the period 2000 - 2008 by combining the geostrophic currents estimated from sea surface height with Ekman current estimated from the wind stress. Particularly, weight functions were introduced when calculating the Ekman currents to eliminate the discontinuity near 25°S and 25°N. These satellite-derived currents have been compared with TAO current meter and the SCUD product, respectively. The comparison showed that satellite-derived currents not only could capture the characteristics of ocean surface currents but also had high accuracy and reliability. The result showed that this innovatory method was effective.
基于 NCEP/NCAR 逐日再分析资料，应用小波分析方法研究讨论了西太平洋、南海、阿拉伯海等近赤道季风区 850 hPa 纬向风场低频振荡与 El Nino 发生发展的相关特征。研究发现，在 El Nino 发生前期，30～50 d 低频振荡会出现显著的增强，El Nino 发生后，30～50 d 低频振荡明显减小，120～150 d 准定常波动加强。分析表明，近赤道季风区显著低频振荡是 El Nino 发生发展的一个重要前兆，低频振荡能量向甚低频段的转移和输送可能是 El Nino 发生的一个重要机理。
