The observed tidal and residual currents in the Andaman Sea during the second half of 2016

LIU Yanliang; GUO Jingsong; WANG Huiwu; XUE Yuhuan; KHOKIATTIWONG Somkiat; YU Weidong

doi:10.1007/s13131-018-1261-x

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(9): 13-21

LIU Yanliang, GUO Jingsong, WANG Huiwu, XUE Yuhuan, KHOKIATTIWONG Somkiat, YU Weidong. The observed tidal and residual currents in the Andaman Sea during the second half of 2016[J]. Acta Oceanologica Sinica, 2018, 37(9): 13-21. doi: 10.1007/s13131-018-1261-x

Citation:

LIU Yanliang, GUO Jingsong, WANG Huiwu, XUE Yuhuan, KHOKIATTIWONG Somkiat, YU Weidong. The observed tidal and residual currents in the Andaman Sea during the second half of 2016[J]. Acta Oceanologica Sinica, 2018, 37(9): 13-21. doi: 10.1007/s13131-018-1261-x

Citation:

LIU Yanliang, GUO Jingsong, WANG Huiwu, XUE Yuhuan, KHOKIATTIWONG Somkiat, YU Weidong. The observed tidal and residual currents in the Andaman Sea during the second half of 2016[J]. Acta Oceanologica Sinica, 2018, 37(9): 13-21. doi: 10.1007/s13131-018-1261-x

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The observed tidal and residual currents in the Andaman Sea during the second half of 2016

doi: 10.1007/s13131-018-1261-x

1.
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
2.
Center for Ocean and Climate Research, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
Phuket Marine Biological Center, Department of Marine and Coastal Resources, Phuket 83000, Thailand
4.
Laboratory for Regional Oceanography and Numerical Modeling, Pilot Qingdao National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China

Received Date: 2017-11-17

Abstract

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.
- Andaman Sea,
- tidal current,
- low frequency current

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