Vertical Migration of Sound Scatterers in the Southern Yellow Sea in Summer |
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Authors: | Lian-Gang Lü Jianjun Liu Fei Yu Wei Wu Xiaodong Yang |
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Institution: | (1) Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography State Oceanic Administration, 266061 Qingdao, China |
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Abstract: | Acoustic volume backscattering strength data were collected and Conductivity Temperature Depth (CTD) measur e m e n t s were
conducted in the southern Yellow Sea in summer 2005 and 2006. The high temporal and vertical resolution acoustic data measured
with a 307 kHz Acoustic Doppler Current Profiler (ADCP) and a 250 kHz acoustic Doppler profile (ADP) had dominant diel variation,
which resulted from vertical migration of sound scatterers. Some scatterers congregating in the bottom layer in the daytime
migrated upward at dusk, and migrated downward into the bottom layer at dawn. The migration speeds were estimated. More than
33 days data show that the diel migration varies with time. The feature of migration measured with ADCP and ADP is consistent
to some extent with what is described in the study on vertical migration of zooplankton in the southern Yellow Sea with conventional
net samples. |
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Keywords: | vertical migration sound scatterer migration speed diel variation southern Yellow Sea |
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