Preservation of black carbon in the shelf sediments of the East China Sea
Preservation of black carbon in the shelf sediments of the East China Sea
复制标题
东海陆架沉积物中黑碳的保存
DOI：
10.1007/s11434-007-0452-1
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发表时间：
2007-11
影响因子：
--
通讯作者：
中科院分区：
文献类型：
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作者：
对长江口和东海陆架3个沉积物柱样的黑碳（BC）含量和碳同位素（14 C，13 C）组成进行了测定。BC的浓度范围为0.02至0.14毫克/克（干重），并占5%至26%的沉积总有机碳（TOC）库。结果表明，长江口沉积物中的BC含量高于东海陆架沉积物中的BC含量，表明长江径流对BC向沿岸的输送起着重要作用。放射性碳测量表明，BC年龄在距今6910 ~ 12250年之间，比沉积物中TOC的~（14）C年龄大3700 ~ 9000年。这些可变的放射性碳年龄表明，沉积物中保存的BC来自生物质火和化石燃料燃烧的产物，以及来自古老的岩石风化。基于同位素质量平衡模型，我们计算出化石燃料燃烧贡献了这些沉积物中保存的大部分BC（60%-80%），并随深度和位置而变化。这种“慢循环”的生物碳在东海陆架沉积物中的沉积和埋藏代表了一个重要的碳汇库，并可能对该地区的碳循环产生重大影响。
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 the14C 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.
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影响因子：
5.2
作者：
Gustafsson, Ö;Bucheli, TD;Eglinton, TI
通讯作者：
Eglinton, TI
影响因子：
5
作者：
C. Masiello;E. Druffel;L. Currie
通讯作者：
C. Masiello;E. Druffel;L. Currie
DOI：
10.1007/978-3-642-59171-6
发表时间：
1997
期刊：
--
影响因子：
--
作者：
J. Clark
通讯作者：
J. Clark
影响因子：
5.2
作者：
Guo, LD;Semiletov, I;White, D
通讯作者：
White, D
影响因子：
56.9
作者：
Masiello, CA;Druffel, ERM
通讯作者：
Druffel, ERM