2012年黄海绿潮藻早期发生和聚集动力学成因分析

Dynamic analyses of early development and gather of green macroalgae in 2012

利用2012年4月份浒苔藻早期调查数据和海洋模型FVCOM,对浒苔早期发生地的苏北海域进行水动力模拟,分析浒苔在该海域发生和聚集的动力学成因。结果表明,浒苔最初还是发生在南通启东沿海,尤其是小洋口外的太阳岛附近应当是浒苔早期暴发的主要发源地之一,并逐渐向北和外海发展,吕四附近的沿岸应当不是早期浒苔暴发的发源地,浒苔大部分都位于辐射沙洲的槽沟附近。模拟结果发现,由于潮流的作用导致早期浒苔聚集并也呈与辐射沙洲相一致放射状的条带状或斑块状分布,黄海苏北浅滩潮致锋面上升流是诱发浒苔早期暴发的因素之一。

Dynamics of green macroalgae early development and aggregation in the northern Jiangsu Shoal- water region were simulated using survey data and the FVCOM ocean model for April 2012. The results indicated that in2012,green macroalgae initially bloomed along the Qidong coast of Nantong,concentrated in the Sun Island region around Xiaoyangkou. This region is one of the primary sources for early blooms of green macroalgae with gradual expansion northward and toward the open seas. The coastal area around the Lvsi harbor does not serve as a center of origin for early blooms of green macroalgae. The survey found that most of the green macroalgae was gathered near the grooves of the radial sand ridge. Due to tidal impacts,the early onset of green macroalgae accumulation is consistent with the radial sand ridge to radial banded,or patch- shaped,distribution. The combination of tides and frontal upwelling of northern Jiangsu Shoal- water in the Yellow Sea was a major factor in inducing green macroalgae blooms.