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

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

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  • 国家科技期刊平台
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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.

mooring observationWyrtki JetRossby wavesintraseasonal variation

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

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First Institute of Oceanography,and Key Laboratory of Marine Science and Numerical Modeling,Ministry of Natural Resources,Qingdao 266061,China

Shandong Key Laboratory of Marine Science and Numerical Modeling,Qingdao 266061,China

Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China

Phuket Marine Biological Center,Department of Marine and Coastal Resources,Phuket 83000,Thailand

Marine and Coastal Resources Research & Development Institute,Department of Marine and Coastal Resources,Bangkok 10210,Thailand

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Laoshan Laboratory国家重点研发计划

LSK2022030032022YFC3104100

2024

10.1007/s00343-023-2405-1

海洋湖沼学报(英文版)
中国海洋湖沼学会

海洋湖沼学报(英文版)

CSTPCD
影响因子：0.386
ISSN：2096-5508
年,卷(期)：2024.42(2)
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