NDLI: The sources and composition of organic matter in sediments of the Jiaozhou Bay: implications for environmental changes on a centennial time scale

Content Provider	Springer Nature Link
Author	Kang, Xuming Song, Jinming Yuan, Huamao Li, Xuegang Li, Ning Duan, Liqin
Copyright Year	2017
Abstract	The Jiaozhou Bay is characterized by heavy eutrophication that is associated with intensive anthropogenic activities. Four core sediments from the Jiaozhou Bay are analyzed using bulk technologies, including sedimentary total organic carbon (TOC), total nitrogen (TN), the stable carbon (δ $^{13}$C) and nitrogen (δ $^{15}$N) isotopic composition to obtain the comprehensive understanding of the source and composition of sedimentary organic matter and further shed light on the environmental changes of the Jiaozhou Bay on a centennial time scale. Results suggest that the TOC and TN concentrations increase in the upper core, having indicated a probable eutrophication process since the 1920s in the inner bay and the 2000s in the bay mouth. The TOC and TN concentrations outside the bay have also changed since 1916 owing to the variation of terrigenous input. Considering TOC/TN ratio, δ $^{13}$C and δ $^{15}$N, it can be concluded there is a mixture of terrigenous and marine organic matter sources in the study area. A simple two end-member (terrigenous and marine) mixing model using δ $^{13}$C indicats that 45%–79% of TOC in the Jiaozhou Bay is from the marine source. The environmental changes of the Jiaozhou Bay are recorded by geochemical proxies, which are influenced by the intensive anthropogenic activities (e.g., extensive use of fertilizers, and discharge of sewage) and climate changes (e.g., rainfall).
Starting Page	68
Ending Page	78
Page Count	11
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	36
Issue Number	11
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2017-11-09
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	organic matter sources anthropogenic activities environmental changes sediments Jiaozhou Bay Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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