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LIU Yanliang,GUO Jingsong,WANG Huiwu,XUE Yuhuan,KHOKIATTIWONG Somkiat,YU Weidong. 2018. The observed tidal and residual currents in the Andaman Sea during the second half of 2016. Acta Oceanologica Sinica, 37(9):13-21
The observed tidal and residual currents in the Andaman Sea during the second half of 2016
2016下半年安达曼海潮、余流观测分析
Received:November 17, 2017  
DOI:10.1007/s13131-018-1261-x
Key words:Andaman Sea  tidal current  low frequency current
中文关键词:  安达曼海  潮流  低频流
基金项目:The National Key Research and Development Program of China under contract No. 2017YFC1405100; the National Natural Science Foundation of China under contract No. 41406034; the Basic Scientific Research Fund for National Public Institutes of China under contract No. GY0215P05.
Author NameAffiliationE-mail
LIU Yanliang Center for Ocean and Climate Research, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Pilot Qingdao National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China 
 
GUO Jingsong Center for Ocean and Climate Research, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
WANG Huiwu Center for Ocean and Climate Research, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
XUE Yuhuan Center for Ocean and Climate Research, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
KHOKIATTIWONG Somkiat Phuket Marine Biological Center, Department of Marine and Coastal Resources, Phuket 83000, Thailand  
YU Weidong Laboratory for Regional Oceanography and Numerical Modeling, Pilot Qingdao National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China wdyu@fio.org.cn 
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Abstract:
      The characteristics of currents and tidal currents in the Andaman Sea (AS) are studied during the second half of 2016 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.
中文摘要:
      基于2016下半年在安达曼海8.6°N, 95.6°E布放的锚定潜标观测的ADCP数据,分析了安达曼海潮、余流特征。观测期间,平均流速为5-10cm/s,从深度20米到130米平均流向大致向南。使用5天截断频率所得到的低频流和高频流均方根和平均动能大小相当,说明两者对总流速同等重要。谱分析表明,季节内信号、半月周期、半日潮周期及3-5天周期比较显著。涡动动能斜压性强于平均动能,两者都是底部最大,70m最弱。除几次短暂的北向流外,低频流大部分时间向南流。在夏季风期间,低频流流向大致向南,而冬季风期间大致向北。两次显著的南向流峰是经向流80天周期震荡的主要来源。其中第一次峰值是受从北部入口进入安达曼海,并从南部出口流出的大尺度环流场影响,而第二次峰值与局地涡旋过程有关。而纬向流40天周期主要受局地风场和赤道强迫引起地转变化影响。潮流以半日潮为主,其中M2和N2分潮占据最大长轴的前两位。天文分潮MM和MSF也相对重要。全日分潮较弱, 浅水分潮可以忽略不计。本文主要介绍安达曼海潮、余流第一手观测资料及其分析结果。
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