title: [Estimation of the flux of inorganic nitrogen flowing into the East China Sea].
abstract: The flux of inorganic nitrogen flowing into the East China Sea was estimated based on the systematic analysis of all the pollution sources from 1980-2005. The result showed that the flux of inorganic nitrogen had been increasing from the early 1980s to the early 21st century. In detail, the flux was about 8.8 x 10(5) t x a(-1) in the early 1980s, and increased to about 2.6 x 10(6) t x a(-1) in the early of 21st century. The annual increasing rate was about 4.3%, and the mean flux was 1.8 x 10(6) t x a(-1). The flux of inorganic nitrogen of Yangtze River had also been increasing from early 1980s to the early 21st century. In detail, the flux was 4.0 x 10(5) t x a(-1) in the early 1980s, and increased to about 6.2 x 10(5) t x a(-1) in the middle 1980s, and was then kept at this value to the end of 1980s. After that, the flux value increased quickly from the early 1990s to 1.8 x 10(6) t x a(-1) in the early 21st century. Of all the sources, the proportion of land-source inorganic nitrogen was the largest, which was about 79%, among which, the river-source, the sewage-source and the non-point source accounted for 73%, 4% and 2%, respectively. Besides the land-source, the air-source and the mariculture-source accounted for 18% and 3%. The proportion of flux of Yangtze River in the river source was 76.5%.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China. wjalnsj@163.com
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Wu
authors.forename: Qian
authors.initials: Q
authors.lastname: Fang
authors.forename: Xiao-Yong
authors.initials: XY
authors.lastname: Shi
authors.forename: Ke-Qiang
authors.initials: KQ
authors.lastname: Li
authors.forename: Chuan-Song
authors.initials: CS
authors.lastname: Zhang
authors.forename: Xiu-Lin
authors.initials: XL
authors.lastname: Wang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D007287:Inorganic Chemicals / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D009792:Oceans and Seas; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007287:Inorganic Chemicals; D014874:Water Pollutants, Chemical; D009584:Nitrogen