Shi Qiang¹, Gao Zhenhui¹, Li Qinliang¹, Zhang Aijun¹, Sun Peiyan¹, Yang Jianqiang¹, Zhou Zhiliang¹, Qiu Li², ¹The North Sea Monitoring Center, State Oceanic Administration, Qingdao 266003;China; ²The North Sea Information Center, State Oceanic Administration, Qingdao 266003;China)

Abstract

Based on analyzing monitor data of HAB (harmful algal blooms) in Bayuquan coastal region of Bohai Sea, the author think that HAB can formed easily in coastal surface seawater frontal zone of SST, Salinity, DIN, DIP, et al. HABs disappearing went with coastal surface seawater frontal zones weakening. Red tides of Noctiluca Scintillans in Bayuquan coastal region are fit for seawater which is high salinity, high SST and adequate NP ratio, But comparison with Noctiluca scintillans, Red tides of Leptocylindrus danicus and Eucampia zoodicacus are fit for seawater which is low salinity, low SST and high NP ratio. These weather changes, including daily mean air temperature sudden rising, pressure sudden descending, would play induction role in the Red tides formed.