DOI: 10.1007/s10533-017-0395-9
Scopus记录号: 2-s2.0-85032794907
论文题名: Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada
作者: Thibodeau B. ; Migon C. ; Dufour A. ; Poirier A. ; Mari X. ; Ghaleb B. ; Legendre L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 136, 期: 3 起始页码: 279
结束页码: 291
语种: 英语
英文关键词: Carbon budget
; Climate change
; Ocean
; Oligotrophy
; Particulate matter
; Vertical transfer
Scopus关键词: accumulation
; carbon budget
; climate change
; concentration (composition)
; core analysis
; isotopic composition
; lead
; marine environment
; marine sediment
; ocean
; oligotrophic environment
; organic matter
; particulate matter
; primary production
; transport process
; vertical movement
; Canada
; Hudson Bay
英文摘要: Atmospheric input of anthropogenic lead increased globally over the last centuries. The present study shows that the concentrations of lead in sediment cores from low-productivity Hudson Bay, northern Canada, remained relatively constant over the last centuries. The lack of imprint of the increased anthropogenic lead input in this marine environment is not consistent with the increased lead concentrations in nearby lakes over the same period. In addition, the observed trend in lead isotopic composition in our cores suggests an apparent progressive overprint of anthropogenic lead during the 1900s. In other words, isotopes clearly registered the increasingly anthropogenic nature of lead in the sedimentary record, but total lead concentrations remained constant, indicating that some process limited the export of lead to the sediment. These observations point to a long-term limitation of the downward export of particles in Hudson Bay. Given that the source of lead was the same for both Hudson Bay and neighboring high-productivity lakes, we hypothesize that the very low primary productivity of Hudson Bay waters was responsible for the low vertical export of lead to marine sediments. We further propose that primary productivity is the most important factor that generally drives the vertical export of particulate matter, and thus hydrophobic contaminants, in near-oligotrophic marine environments. © 2017, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83207
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong; Swire Institute for Marine Science, The University of Hong Kong, Cape d’Aguilar Road, Shek O, Hong Kong, Hong Kong; Sorbonne Universités, UPMC, Université Paris 06, CNRS, Laboratoire d’Océanographie de Villefranche-sur-mer (LOV), 181 Chemin du Lazaret, Villefranche-sur-Mer, France; Geotop, Université du Québec à Montréal, Montreal, Canada; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France
Recommended Citation:
Thibodeau B.,Migon C.,Dufour A.,et al. Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada[J]. Biogeochemistry,2017-01-01,136(3)