Distribution characteristics of total organic carbon and influence factors in the Yangtze River Estuary in autumn 2015
ZHANG Shan-shan1,2, XIAN Wei-wei1,3, LIANG Cui1
1. Key Laboratory of Marine Ecology & Environmental Science, Institute of Oceanology Chinese Academy of Sciences, Qingdao 266071, China;
2. University of Chineseaz Academy of Sciences, Beijing 100049, China;
3. Marine Ecology & Environmental Science Functional Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
Abstract：Based on the data from the comprehensive survey in the Yangtze River estuary and its adjacent waters in November 2015, the distribution characteristics of the particulate organic carbon (POC) and dissolved organic carbon (DOC) and their relationship with environmental factors were analyzed. Results suggested that the concentrations of POC in the Yangtze River estuary ranged from 0.65 to 8.25 mg/L, with an average of 1.34 mg/L. POC concentration decreased seaward, with its highest value occurring in the coastal zones, and, vertically, the POC concentration in bottom layer was higher than in the surface. DOC concentration ranged from 0.77 to 2.69 mg/L, with a mean value of 1.49 mg/L. Similar to POC, DOC also showed higher concentrations in coastal zones and lower in outer sea in horizontal distribution, while, DOC concentration was higher in the surface than in the bottom in vertical distribution, which was opposite to POC. POC had a positive relationship with total suspended matter (TSM), which indicated a profound impact by terrestrial inputs on the POC distribution. The significant correlation between organic carbon and salinity indicated that the effect of salinity on organic carbon was enhanced by the conversion of POC to DOC and the dilution of organic carbon by seawater. The strong correlation between DOC and COD indicated that DOC and oxygen-demanding organic carbon had the same source in some degree, part of DOC might originate from the runoff and sewage discharge along the river.
ZHANG Shan-shan,XIAN Wei-wei,LIANG Cui. Distribution characteristics of total organic carbon and influence factors in the Yangtze River Estuary in autumn 2015[J]. Marine Environmental Science, 2018, 37(1): 55-61.
CHEN C T A,ZHAI W D,DAI M H.Riverine input and air-sea CO2 exchanges near the Changjiang (Yangtze River) estuary:status quo and implication on possible future changes in metabolic status[J].Continental Shelf Research,2008,28(12):1476-1482.
TIPPING E,MARKER A F H,BUTTERWICKC,et al.Organic carbon in the Humber river[J].Science of the Total Environment,1997,194/195:345-355.
[5]
HARVEY H R,MANNINO A.The chemical composition and cycling of particulate andmacromolecular dissolved organic matter in temperate estuaries as revealed by molecular organic tracers[J].Organic Geochemistry,2001,32(4):527-542.
[6]
ZHANG W Y,JIN H Y,YAO X Y,et al.Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters[J].Acta Oceanologica Sinica,2015,34(10):46-56.
[7]
MILLIMAN J D,XIE Q C,YANG Z S.Transfer of particulate organic carbon and nitrogen from the Yangtze River to the ocean[J].American Journal of Science,1984,284(7):824-834.
ZHU Z Y,ZHANG J,WU Y,et al.Bulk particulate organic carbon in the East China Sea:tidal influence and bottom transport[J].Progress in Oceanography,2006,69(1):37-60.
BELYAEV N A,PONYAEV M S,KIRIUTIN A M.Organic carbon in water,particulate matter,and upper layer of bottom sediments of the central part of the Kara Sea[J].Oceanology,2015,55(4):508-520.
