Current observation and analysis based on mooring systems in the Andaman Sea

Yimeng WANG; Jingsong GUO; Dapeng QU; Zhixin ZHANG; Chalermrat SANGMANEE; Varintha VASINAMEKHIN; Binghuo GUO

doi:10.1007/s00343-023-2405-1

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Current observation and analysis based on mooring systems in the Andaman Sea

Physics | Updated：2024-10-11

- Current observation and analysis based on mooring systems in the Andaman Sea
- Journal of Oceanology and Limnology Vol. 42, Issue 2, Pages: 484-491(2024)
- Affiliations：
  
  1.First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
  2.Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  3.Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao 266061, China
  4.Phuket Marine Biological Center, Department of Marine and Coastal Resources, Phuket 83000, Thailand
  5.Marine and Coastal Resources Research & Development Institute, Department of Marine and Coastal Resources, Bangkok 10210, Thailand
- Author bio：
  
  gjings23@fio.org.cn
- Funds：
- DOI：10.1007/s00343-023-2405-1
  CLC：
- Received：19 January 2023，
  
  Online First：15 June 2023，
  
  Published：01 March 2024
- Accepted：
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WANG Yimeng,GUO Jingsong,QU Dapeng,et al.Current observation and analysis based on mooring systems in the Andaman Sea[J].Journal of Oceanology and Limnology,2024,42(02):484-491.
DOI：

WANG Yimeng,GUO Jingsong,QU Dapeng,et al.Current observation and analysis based on mooring systems in the Andaman Sea[J].Journal of Oceanology and Limnology,2024,42(02):484-491. DOI： 10.1007/s00343-023-2405-1.

摘要

Abstract

The basic structure and intraseasonal evolution of currents in the southeastern Andaman Sea was analyzed based on data collected in 2017 from two subsurface moorings (C1 and C5). Periodic variation in the upper ocean currents of the Andaman Sea was investigated by combining observational and satellite data. Mooring observations show that rapid changes of current speed and direction occurred in May and June

with a significant increase in current velocity at the C1 mooring. In the second half of the year

southward flow dominated at the C1 mooring

and alternating northward and southward flows were evident at the C5 mooring during the same period but the northward flow prevailed in boreal winter. In addition

analysis of the power spectra of the upper currents revealed that the tidal period at both moorings is primarily semidiurnal with weaker energy than that of the low-frequency currents. The upper ocean currents at the C1 and C5 moorings exhibited intraseasonal variation of 30–60 d and 120 d

while the zonal current at the C1 mooring exhibited a notable period of approximately 180 d. Further analysis indicated that the variability of currents in the Andaman Sea is influenced primarily by equatorial Kelvin waves and Rossby wave packets. Moreover

our results suggest that equatorial Kelvin waves from the eastern Indian Ocean entered the Andaman Sea in the form of Wyrtki Jets and propagated primarily along two distinct pathways during the observation period. In addition to coastal boundary Kelvin waves

it was found that a branch of the Wyrtki Jet that directly enters the Andaman Sea and flows northward along the slope of the continental shelf

and reflected Rossby wave packets by topography.

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references

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Related Institution

Shandong Key Laboratory of Marine Science and Numerical Modeling

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