Characteristics Of Physical Elements During The 2008 Algal Blooming In The Yellow Sea

Since May 2008 the Enteromorpha prolifera bloosms in the Yellow Sea and East China Sea.This article determines the time that Enteromorpha prolifera lasts by summarizing exiting reports.The possible process of the Enteromorpha prolifera bloosmsing is surmised.Based on this the paper analyzes the effects of the wind and temperature.For the purpose of discussing the circulation's effect, paper uses the POM ocean modal to simulate the climatological circulation of the East China Sea, and studys the impact of the wind and tide to the the East China Sea's physical environment.Also current from May to June is simulated further to study the current's impact to the Enteromorpha prolifera.The relatively accurate time and progress of the Enteromorpha prolifera is:the Enteromorpha prolifera firstly appeared at the middle of the Yellow Sea, about the north of the ChangJiang Estuary.The location is at about(122°E,33°N).The Enteromorpha prolifera then have been found in the sea of Qingdao by the end of May.Enteromorpha prolifera began to increase significantly from June 14,2008.Great amount of Enteromorpha prolifera appeared form June 25,2008 in shore of Qingdao and sailing region of Olympic Games.By the day June 29 the Yellow Sea at the south of Shangdong has almost been distributed by Enteromorpha prolifera.The area and density had been reduced through cleaning from the day July 19.The temperature is very appropriate in the period from Early May to the end of June.Moreover the contour of temperature can show the range and moving direction of the Enteromorpha prolifera.The alga densely distributed area is consistent with the wind convergence and the drift of the area is related to the downwind direction.The climatological circulation of the East China Sea is simulated and there are the following conclusions:Standard simulation adds in the averaged monthly temperature, salinity and wind force.The simulated temperature in winter appears increased trend from north to south, the temperature contour shows southwest-northeast direction.The salient features of the 35°N layer is the low temperature, water temperature at vertical layer is almost the same.Mixing directly access to deep water.Low temperature appear at the east and west sides of the layer, Intermediate water temperature is high.The simulated summer sea surface temperature is more uniform than that in winter.The temperature of 35°N layer rise to high values.The stratification phenomenon is significantly notable, upper is mixed layer.In summer there is the Yellow Sea Cold Water Mass at the middle low-lying land of Yellow Sea.Standard simulation well simulated the Kuroshio and the vortex, the Taiwan Warm Current, the Tsushima Warm Current, the Yellow Sea Warm Current and Coastal flow and their seasonal variation.The Yellow Sea Coastal flow which is generally considered southern direction in the standard simulation is:the surface flow is southward in winter, but it is northward in summer.The simulation that removing the wind stress shows that the Yellow Sea Coastal flow and East Sea Coastal flow which are south flow in summer turn to north in winter.Another change is that the Yellow Sea Warm flow becomes significant.The depth averaged flow shows Little difference to the standard simulation.The northern surface flow in summer is corresponding weaked when the windstress is removed.All flows in the East China Sea, including the Taiwan Warm Current, the Tsushima Warm Current, the Yellow Sea Warm Current and Korea Coastal flow still exist and are very strong, which support the view that edge flow and continental shelf flow is mainly forced by the open sea current.Besides the seasonal variation of flow is weakend.The Yellow Sea cold water mass becomes more obvious after M2 tidal is joined.The circulation pattern is without much difference with the standard simulation.Temperature and circulation of the year 2008 is simulated.The period from May to July which Enteromorpha prolifera bloosms is analyzed.Temperature simulated is in good agreement of that is measured.The simulated circulation form May 15,2008 to June 30,2008 is in good correspondence with wind in the same period.The Yellow Sea coastal current which is northward flow can explain the northward drift of the Enteromorpha prolifera.