COHERENS模式在长江口赤潮源推测中的应用

Application of Coherens in Estimating the Sources of Red Tides in the Changjiang River Estuary and Adjacent Sea Areas

在COHERENS基础上,建立了一个σ坐标下的三维渤海、黄海和东海海域夏季环流数值模式,较好地模拟了夏季渤海、黄海和东海海域的环流系统(黑潮、台湾暖流、对马暖流和长江冲淡水)。在此斜压流场的基础上,进行了拉格朗日颗粒追踪和欧拉输运数值模拟来推测长江口及其邻近海域赤潮高发区的可能赤潮源。提出台湾海峡、福建浙江近海和台湾东北海底存在赤潮的“种子”,它们很可能就是我国长江口赤潮高发区的赤潮源,这仍需现场的海洋调查去证实。数值模拟推测赤潮源是对流-扩散输运方法在海洋生态学领域中的一个新应用。

Based on the COHERENS （ a Coupled Hydrodynamical Ecological model for Regional Shelf seas）, a three-dimensional baroclinic model for the summer of East China Sea is established with the sigma-coordinate in the vertical direction and spherical coordinate in the horizontal direction. The circulation patterns of the Kuroshio Current, the Taiwan Warm Current, the Tsushima Current and the Changjiang Diluted Water were successfully simulated in this model. The calculated results are fairly consistent with the previous observation and studies. Based on this baroclinic current field, we simulated the Lagranian particles tracking and the Eulerian method to estimate possible origins of the regions where red tides frequently occurred in the Changjiang River estuary and adjacent sea areas. If there are ＂seeds＂ （ cysts ） of the red tide algae in the seabed of the Taiwan Strait, the offshore of Fujian and Zhejiang Provinces and the northeast Taiwan Island, those are extremely possible sources of the red tides in the Changjiang River estuary and adjacent sea areas. Field data are needed to confirm it. Numerical simulation to estimate the source of the red tides is a new application of the advection-diffusion transport equations in the marine ecology.