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Chinese Science Bulletin

, Volume 52, Issue 22, pp 3155–3161 | Cite as

Preservation of black carbon in the shelf sediments of the East China Sea

  • Wang XuChen Email author
  • Li AnChun 
Articles Oceanology

Abstract

Concentrations and carbon isotopic (14C, 13C) compositions of black carbon (BC) were measured for three sediment cores collected from the Changjiang River estuary and the shelf of the East China Sea. BC concentrations ranged from 0.02 to 0.14 mg/g (dry weight), and accounted for 5% to 26% of the sedimentary total organic carbon (TOC) pool. Among the three sediment cores collected at each site, sediment from the Changjiang River estuary had relatively high BC contents compared with the sediments from the East China Sea shelf, suggesting that the Changjiang River discharge played an important role in the delivery of BC to the coastal region. Radiocarbon measurements indicate that the ages of BC are in the range of 6910 to 12250 years old B.P. (before present), that is in general, 3700 to 9000 years older than the 14C ages of TOC in the sediments. These variable radiocarbon ages suggest that the BC preserved in the sediments was derived from the products of both biomass fire and fossil fuel combustion, as well as from ancient rock weathering. Based on an isotopic mass balance model, we calculated that fossil fuel combustion contributed most (60%–80%) of the BC preserved in these sediments and varied with depth and locations. The deposition and burial of this “slow-cycling” BC in the sediments of the East China Sea shelf represent a significant pool of carbon sink and could greatly influence carbon cycling in the region.

Keywords

black carbon marine sediment carbon cycle Changjiang River estuary East China Sea 

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Copyright information

© Science in China Press 2007

Authors and Affiliations

  1. 1.Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.Department of Environmental, Earth and Ocean SciencesUniversity of Massachusetts at BostonBostonUSA

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