title: Variability of factors driving spatial and temporal dispersion in river plume and Chattonella antiqua bloom in the Yatsushiro Sea, Japan.
abstract: The dynamics of river plume in relation to harmful blooms of the raphidophycean flagellate, Chattonella antiqua in summer 2008-2010 in the Yatsushiro Sea, Japan were studied using a hydrodynamic model and monitoring data. In the southern area, the bloom formed in the waters stratified by a halocline caused by the southward expansion of riverine water from the Kuma River after the bloom initially forming in the northern area. The timing of the southward riverine water advection can be explained by the balance between the wind stress term and the pressure gradient term calculated from the horizontal density difference between the northern and southern areas. The wind stress and pressure gradient terms were evaluated using the sea surface temperature, salinity, wind speed and direction at two stations. Real time monitoring or continuous observations in these areas will enable nowcasts of bloom expansion when a bloom develops in the northern area.
authors.affiliation: National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa 236-8648, Japan. Electronic address: kazuaoki@affrc.go.jp.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Aoki
authors.affiliation: National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan.
authors.forename: Goh
authors.initials: G
authors.lastname: Onitsuka
authors.affiliation: National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Shimizu
authors.affiliation: Hokkaido National Fisheries Research Institute, Fisheries Research Agency, 116 Katsurakoi, Kushiro, Hokkaido 085-0802, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kuroda
authors.affiliation: Azuma-cho Fishery Cooperative Association, 1769-1 Takanosu, Nagashima-cho, Izumi-gun, Kagoshima 899-1401, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Matsuo
authors.affiliation: Azuma-cho Fishery Cooperative Association, 1769-1 Takanosu, Nagashima-cho, Izumi-gun, Kagoshima 899-1401, Japan.
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Kitadai
authors.affiliation: Kumamoto Prefectural Fisheries Research Center, 2450-2 Naka, Oyano-machi, Kami-amakusa, Kumamoto 869-3603, Japan.
authors.forename: Kiyonari
authors.initials: K
authors.lastname: Sakurada
authors.affiliation: Kumamoto Prefectural Fisheries Research Center, 2450-2 Naka, Oyano-machi, Kami-amakusa, Kumamoto 869-3603, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Ando
authors.affiliation: Kagoshima Prefectural Fisheries Technology and Development Center, 160-10 Takadaue, Iwamotoaza, Ibusuki, Kagoshima 891-0315, Japan.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Nishi
authors.affiliation: Kagoshima Prefectural Fisheries Technology and Development Center, 160-10 Takadaue, Iwamotoaza, Ibusuki, Kagoshima 891-0315, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Tahara
mesh_terms: D004141:Dinoflagellida / Q000502:physiology*; D057097:Harmful Algal Bloom; D007564:Japan; D009792:Oceans and Seas; D045483:Rivers; D054712:Salinity; D012621:Seasons; D013696:Temperature; D013997:Time Factors; D014872:Water Movements; D014919:Wind
keywords: Chattonella antiqua; Pressure gradient; River plume; Wind stress; Yatsushiro Sea