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The Study of Spatial and Temporal Distribution Characteristics of Internal Waves in the South China Sea from Multi-satellite Data |
GAN Xi-lin1, HUANG Wei-gen1, YANG Jing-song1, LI Xiao-feng2,LOU Xiu-lin1, SHI Ai-qin1
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(1.State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography State Oceanic Administration,Hangzhou310012,China; 2.NOAA/NESDIS,E/RA3,Room102,World Weather Building, 5200Auth Road,Camp Springs,Maryland20746,USA) |
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Abstract More than 300 satellite images including SAR (ERS1/2, Radarsat and Envisat), SPOT, Landsat, IRS and NOAA AVHRR images from 1995 to 2005 were analyzed to obtain spatial and temporal distribution of internal waves in the South China Sea (SCS). The amplitude and speed are calculated based on the KdV equation and Levitus' historical mix-layer depth data. The statistical analysis showed that three areas including Luzon Strait, Dongsha Island and the Northeastern Hainan Island were found to have regular internal wave activity. Most of the internal waves travel westly. Near the Luzon Strait, the phase speed can reach 3 m/s, the amplitude can exceed 100 m; near the Dongsha Island, the phase speed is in1.5~2 m/s around, the amplitude is in 20~80 m around; in the western and northern part of Dongsha Island, the phase speed is in 1~1.5 m/s around, the amplitude is in 5~20 m around; in the northeastern of Hainan, the phase speed is in 0.4~0.8 m/s around, the amplitude is in 2~4 m around. The temporal distribution characteristics of internal waves are: the internal waves occur mostly from Apr. to Sept.,little internal waves are observed from Jun. to Mar. and Nov. to Dec.; in every month the internal waves have highly activities from 16 to 19th day.
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Received: 15 November 2006
Published: 25 November 2011
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