摘要
对小风天气条件下表层海流观测资料进行能谱密度分析,指出:东分量海流具有很明显的0.51d、3.9d和7.7d周期。0.51d是半日潮周期,即12h25min的周期;3.9d周期恰与赤道重力陷波n=2相对应,这是南纬3°～4°范围内一个重要波动;7.7d则是大小潮周期。而在北分量海流能谱中,则只有潮流0.51d和7.7d周期,3.9d周期消失,它进一步说明陷波的特征。此外,还用7m和40m层流资料与表层流进行对比,两者变化规律基本一致。
We have used the data of surface currents in calm weather to analyse the density of en-erge spectrum. We have found that the periods of the east - west current are 0. 51 days, 3. 9 days and 7. 7 days. The period of 0. 51 days (1 2 hours and 25 minutes) is the period of the semidiurnal tidal current; that of 3. 9 days is the period of the equatorial gravity trap wave with n=2, which is an important wave in the zone between 3-4°S; and the period of 7. 7 days is the period of the spring- neep tide. In the spectrum density of the north-south current components there are only periods of 0. 51 and 7. 7 days. The period 3. 9 days has vanished. The phenomenon shows the characteristics of the gravity wave. In addition , we also analyse the currents in the 7m and 40m layers, whose characteristics are found coincident with the surface currents.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
1993年第S2期1-9,共9页
Periodical of Ocean University of China
关键词
陷波
海流
赤道
周期
能谱
Trap wave
current
equator
period
energy spectrum
