12th International Conference on Harmful Algae

INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006mikimotoi and P. donghaienseblooms. In the same way, somestimulatory substances excreted byK. mikimotoi on P. donghaiensemay play an important role in thesuccession from K. mikimotoi bloomto P. donghaiense bloom.PO.13-13The low temperaturecharacteristics of the East ChinaSea in early spring of 2005 andits influence on HABsSession: PO.13 - Regional eventsDedi Zhu 1 , Xianwei Bu 1 , YunfengWang 2 , Weiyi Xu 1 , Jilan Su 11 Second Institute of Oceanography, SOA,HANGZHOU, China2 Institute of Oceanography, CAS,QINGDAO, ChinaTemperature characteristics of aHAB-frequent area in the EastChina Sea in early spring 2005 andits influence on a large-scale HABare analyzed, based on survey datafrom 2002~2005 and some relatedhistorical meteorological data. Lowtemperature characteristics wereobvious in the HAB- frequent areaduring the early Spring (early April)2005; water temperature was about2-3 °C lower compared to the sameperiod of 2004 and it quickly rosefrom 10 °C to 17 °C during the lasttwenty days of April. Low airtemperature in March and largedischarge of the Yangtze river inWinter (Jan. to Mar.) in 2005 are themain causes for the lowtemperature in this sea area. Thelow temperature may have been animportant factor for the occurrenceof a dinoflagellate HAB in the spring2005 as opposed to the spring2002~2004.PO.07-12Numerical simulation ofcirculation and its application inred tides in the Changjiang RiverEstuary and adjacent sea areasSession: PO.07 - Ecology andoceanographyLS Zhu, XH ChenSouth China Sea Institute of Oceanology,GUANGZOU, ChinaBased on the COHERENS, a threedimensionalbaroclinic model for thesummer of East China Sea wasestablished with the sigmacoordinatein the vertical directionand spherical coordinate in thehorizontal direction. The circulationpatterns of the Kuroshio Current,the Taiwan Warm Current, theTsushima Current, the ChangjiangDiluted Water and the coastalcurrents were successfullysimulated in this model. Thecalculated results are fairlyconsistent with previousobservations and studies. Based onthis baroclinic current field, wesimulated the Lagranian particlestracking to estimate possible originsof the regions where red tidesfrequently occurred in theChangjiang River Estuary andadjacent sea areas. Does seedingfrom cysts take place from red tidealgae in the seabed of the TaiwanStrait, the offshore area of Fujianand Zhejiang Provinces and thenortheast Taiwan Island, to theChangjiang River Estuary andadjacent sea areas. Field data areneeded to confirm this. The buildingof a numerical model based on theCOHERENS to simulate theLagrangian particle tracking forestimating the source of the redtides is the first attempt of this kindin China.313