Seasonal and interannual variations of nutrient concentrations in the Bungo Channel,Japan

摘要：

　　Bungo Channel connects the Seto Inland Sea and the Pacific Ocean.Using monthly observation data at 29 stations from 1991 to 2008,we examined spatial distributions and temporal variations of nutrient concentrations (nitrate,phosphate and silicate) in the channel and their relation with physical processes observed by water temperature and salinity.According to the variations of nutrients,the channel is divided into three sub-regions: northern part that is connected to the Seto Inland Sea,southern part that faces to the Pacific Ocean,and central part between them.It is apparent that different physical processes control the temporal variations of nutrient concentrations in three sub-regions.The nutrients demonstrate a higher correlation with water temperature than with salinity,indicating strong control from the Pacific Ocean side,where warm but nutrient-poor Kuroshio surface water and cold but nutrient-rich Kuroshio subsurface water flows.The bottom intrusions of Kuroshio water from the Pacific Ocean into the channel is likely a key process determining nutrients level in the channel in summer.The outflow of inland sea water likely influences the nutrients level in May and June when the precipitation is largest in a year.

关键词： Seasonal variation Kuroshio water intrusion oceanic nutrient Seto Inland Sea

作者: Xinyu Guo Qingji Li Yoshitsugu Koizumi Hidetaka Takeoka

作者单位: Center for Marine Environmental Studies, Ehime University, 2-5 Bunkyo-Cho, Matsuyama, Japan 790-8577 Ehime Research Institute of Agriculture, Forestry and Fisheries, 5516 Shitaba, Uwajima, Japan 798-01

会议类型: 国际会议

会议名称: The 17th Pacific -Asian Marginal Seas Meeting(第十七届太平洋与亚洲边缘海国际会议)

会议地点: 杭州

会议语种:英文

页码: 783-787

在线出版日期: 2013-04-23（万方平台首次上网日期，不代表论文的发表时间）