Features of the physical environment associated with green tide in the southwestern Yellow Sea during spring

BAO Min; GUAN Weibing; WANG Zongling; WANG Difeng; CAO Zhenyi; CHEN Qi

doi:10.1007/s13131-015-0692-x

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(7): 97-104

BAO Min, GUAN Weibing, WANG Zongling, WANG Difeng, CAO Zhenyi, CHEN Qi. Features of the physical environment associated with green tide in the southwestern Yellow Sea during spring[J]. Acta Oceanologica Sinica, 2015, 34(7): 97-104. doi: 10.1007/s13131-015-0692-x

Citation:

BAO Min, GUAN Weibing, WANG Zongling, WANG Difeng, CAO Zhenyi, CHEN Qi. Features of the physical environment associated with green tide in the southwestern Yellow Sea during spring[J]. Acta Oceanologica Sinica, 2015, 34(7): 97-104. doi: 10.1007/s13131-015-0692-x

Citation:

BAO Min, GUAN Weibing, WANG Zongling, WANG Difeng, CAO Zhenyi, CHEN Qi. Features of the physical environment associated with green tide in the southwestern Yellow Sea during spring[J]. Acta Oceanologica Sinica, 2015, 34(7): 97-104. doi: 10.1007/s13131-015-0692-x

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Features of the physical environment associated with green tide in the southwestern Yellow Sea during spring

doi: 10.1007/s13131-015-0692-x

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Physical Oceanography, Ocean College, Zhejiang University, Hangzhou 310058, China
3.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received Date: 2015-03-30
Rev Recd Date: 2015-04-16

Abstract

Abstract

Massive green tides caused by Ulva prolifera in the Yellow Sea have occurred every summer since 2007 and have caused huge economic losses for local governments. The Subei (North Jiangsu Province, China) Shoal, with its large-scale Porphyra aquaculture, has been regarded as the most important source of U. prolifera for green tides. To reveal the physical mechanisms of floating and drifting algae in this area, the characteristics of the current, the temperature, the salinity and suspended particulate matter (SPM) in the southwestern Yellow Sea, especially in the Subei Shoal, were studied. The topography of the radial sand ridges in the Subei Shoal constrains the features of the currents and causes net longitudinal and latitudinal movements. The longitudinal net movement is a dominant dynamic factor that can bring U. prolifera into offshore waters. The amount of gas that is produced by algae during photosynthesis determines whether U. prolifera can float well on the sea surface after it is disposed into the water from Porphyra aquacultural apparatus. The Subei Shoal is characterized by a high turbidity, which can result in significant light attenuation and affect the photosynthesis together with the buoyancy of a U. prolifera in the water. According to satellite remote sensing data from 2012, the three-month-averaged surface SPM (April, May and June) in the Subei Shoal was 140 mg/dm³, and the north of the Subei Shoal (the north of 34.5°N), it was 11 mg/dm³. According to the monthly averaged surface SPM in April, the transparency in the Subei Shoal was only 0.1 m, but it often exceeded 2.0 m outside of the Subei Shoal. The results explain why the floating ability of U. prolifera increases significantly once the green algae drifted outside the Subei Shoal.
- Ulva prolifera,
- current,
- temperature,
- salinity,
- suspended particulate matter

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