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The characteristics of currents and tidal currents in the Andaman Sea(AS) are studied during the second half of2016 using observed data from a moored acoustic Doppler current profiler(ADCP) deployed at 8.6°N, 95.6°E.During the observation period, the mean flow is 5–10 cm/s and largely southward. The root mean square and kinetic energies of the low and high frequency flows, which are divided by a cutoff period of 5 d, are at the same level, indicating their identical importance to the total current. A power spectrum analysis shows that intraseasonal oscillations, a tidal-related semilunar month signal, a semidiurnal tidal signal and periods of 3–4 d are prominent. The barocliny of an eddy kinetic energy is stronger than the mean kinetic energy, both of which are the strongest on the bottom and the weakest at 70 m depth. Residual currents are largely southward(northward) during the summer(winter) monsoon season. Two striking peaks of the southward flow cause the 80 d period of meridional currents. The first peak is part of a large-scale circulation, which enters the AS through the northern channel and exits through the southern channel, and the second peak is part of a local vortex. The 40 d oscillation of the zonal current is forced by geostrophic variations attributed to local and equatorial remote forcing. The tidal current is dominated by semidiurnal constituents, and among these, M2 and N2 are the top two largest major axes. Moreover, astronomical tidal constituents MM and MSF are also significant. Diurnal constituents are weak and shallow water tides are ignorable. The aims are to introduce the new current data observed in the AS and to provide initial insights for the tidal and residual currents in the Andaman Sea. 相似文献
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热带印度洋SST的日变化幅度受到大气季节内振荡(Madden-Julian Oscillation,MJO)的调制,其在MJO对流最强(弱)位相达到极小(大)值,并且在MJO对流增强位相显著强于其对流减弱位相。本文利用逐时的再分析海表通量强迫一维海洋混合层模式,定量地诊断了MJO事件中SST日变化的差异成因。结果表明,SST日变化在MJO对流最强与最弱位相的显著差异主要是由短波辐射的季节内变化所致(40%),其次是风应力(38%)和潜热通量(14%),其他要素的影响较小。而SST日变化在MJO对流增强与减弱位相所呈现的不对称特征,主要是由纬向风应力的不对称性所致,这是MJO扰动结构与背景环流相互作用的结果。 相似文献
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2008年孟加拉湾春季暖池生消过程的热收支诊断分析 总被引：1，自引：1，他引：0
在夏季风爆发前孟加拉湾会出现季节性暖池,在季风爆发后它则快速消失。本文利用RAMA浮标阵列中孟加拉湾中部浮标的观测资料,通过进行混合层热收支诊断,对2008年孟加拉湾春季暖池的生消过程进行了分析。结果表明:热通量项主导了暖池的生成和消亡过程,它在暖池生成期表现为强加热效应,而在暖池消亡期变为强冷却效应;垂向卷夹的冷却作用在暖池生成阶段比较突出;温度平流项的冷却作用在冬季较强。对热通量项的进一步分析表明:短波辐射平均热效应在暖池生成期高达0.32℃/d,而在暖池消亡期降低一半,这是使热通量项在两个时期有不同表现的根本原因;潜热通量在各阶段的平均冷却效应基本保持不变,都在-0.14℃/d左右;长波辐射的冷却效应在暖池生成期比较显著,一定程度上减缓了海温的上升速度;感热通量的热效应相对较小。 相似文献