摘要
利用1993年4月至2001年3月的TOPEX/POSEIDON卫星高度计遥感资料,研究了热带大西洋(15°S-25°N,50°W-5°W)海面高度距平和表层环流结构的季节性变化。研究结果表明:夏季和冬季海面高度距平分布呈相反的结构,低纬度海区(0°-15°N之间的海区)海表风应力旋度所产生的Ekman抽吸而导致的海面升降是该海区海面高度距平季节性振荡的重要影响因素。热带大西洋表层流结构大部分海域季节变化不明显,部分流系具有明显季节振荡,东向的北赤道逆流夏季强度较大,冬、春季流速较小;非洲沿岸流冬季流向为东南向,其他季节流向为东北向。值得一提的是,几内亚海湾表层流秋、冬季为东向,而春、夏季为西向。通过卫星跟踪ARGOS漂流浮标观测结果进行的对比验证表明,上述遥感资料分析的表层地转流场与海上观测结果一致。
The seasonal variation of sea level anomaly （SLA） and surface current in the tropical Atlantic （15°S-25°N, 50°W-5°W） have been studied by using the TOPEX/POSEIDON altimeter data from April 1993 to March 2001. The results are as follows： The pattern of SLA distribution in summer is contrary to that in winter, and the seasonal variation of SLA in the low latitude region is attributed to the wind stress curl which induces Ekman pumping. Although most currents in the tropic Atlantic do not show a significant seasonal variation, some surface currents vary seasonally. The eastward North Equatorial Countercurrent is stronger in summer but weaker in spring and winter. African Coastal Current flows southeastward in winter but northeastward in the other seasons. It is noted that the surface current in the Guinea Gulf is eastward in autumn and winter but westward in spring and summer. The results from TOPEX/POSEIDON are verified by those from the Argos drifting buoy trajectories.
出处
《海洋通报》
CAS
CSCD
北大核心
2005年第4期8-16,72,共10页
Marine Science Bulletin
