title: Long-term (1996-2006) variation of nitrogen and phosphorus and their spatial distributions in Tianjin coastal seawater.
abstract: The spatio-temporal varying characteristics of dissolved inorganic nitrogen, reactive phosphate (RP), chemical oxygen demand (COD), and dissolving oxygen (DO) in Tianjin coastal seawater were investigated based on observation from May 1996 to October 2006. The concentrations of dissolved inorganic nitrogen (DIN), RP and COD ascended gradually and their varying ranges were 0.103-2.432, 0.009-0.12, and 0.8-2.9 mg L(-1), respectively. While DO in seawater decreased from 8.9 to 6.1 mg L(-1) gradually. Those indicated that human-induced eutrophication occurred and the seawater quality deteriorated. The spatial distributions of DIN, RP and COD were largely uniform, where isopleths generally descended from estuarine zones and bays to the central areas and from northern area to southern area, indicating that continental input is the dominant source of those pollutants. Especially, peak zones of those pollutants usually appeared near estuaries, Tianjin harbors, and dumping site of dredged sediment, which indicates that the urban and industrial sewage, shipping waste, dredged soil were the main sources for those contaminants in seawater.
authors.affiliation: College of Environmental Science and Engineering, Nankai University, 300071, Tianjin, China.
authors.forename: Shi-tao
authors.initials: ST
authors.lastname: Peng
authors.forename: Ming-xin
authors.initials: MX
authors.lastname: Dai
authors.forename: Yandi
authors.initials: Y
authors.lastname: Hu
authors.forename: Zhi-peng
authors.initials: ZP
authors.lastname: Bai
authors.forename: Ran
authors.initials: R
authors.lastname: Zhou
mesh_terms: D002681:China; D005068:Eutrophication; D008137:Longitudinal Studies; D009584:Nitrogen / Q000032:analysis*; D010100:Oxygen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis*; D012621:Seasons; D012623:Seawater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis; D014877:Water Pollution, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen