DOI: 10.1002/2017GB005708
Scopus记录号: 2-s2.0-85039163624
论文题名: Biological and Climate Controls on North Atlantic Marine Carbon Dynamics Over the Last Millennium: Insights From an Absolutely Dated Shell-Based Record From the North Icelandic Shelf
作者: Reynolds D ; J ; , Hall I ; R ; , Scourse J ; D ; , Richardson C ; A ; , Wanamaker A ; D ; , Butler P ; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 12 起始页码: 1718
结束页码: 1735
语种: 英语
英文关键词: Arctica islandica
; carbon isotopes
; NAO
; North Atlantic
; productivity
; sclerochronology
Scopus关键词: atmospheric circulation
; bivalve
; carbon cycle
; carbon dioxide
; carbon isotope
; carbon sequestration
; chronology
; fractionation
; gyre
; intermediate water
; long-term change
; North Atlantic Oscillation
; reconstruction
; sea surface salinity
; sea surface temperature
; Arctic
; Arctic Ocean
; North Icelandic Shelf
; Arctica islandica
; Bivalvia
英文摘要: Given the rapid increase in atmospheric carbon dioxide concentrations (pCO2) over the industrial era, there is a pressing need to construct long-term records of natural carbon cycling prior to this perturbation and to develop a more robust understanding of the role the oceans play in the sequestration of atmospheric carbon. Here we reconstruct the past biological and climate controls on the carbon isotopic (δ13Cshell) composition of the North Icelandic shelf waters over the last millennium, derived from the shells of the long-lived marine bivalve mollusk Arctica islandica. Variability in the annually resolved δ13Cshell record is dominated by multidecadal variability with a negative trend (−0.003 ± 0.002‰ yr−1) over the industrial era (1800–2000 Common Era). This trend is consistent with the marine Suess effect brought about by the sequestration of isotopically light carbon (δ13C of CO2) derived from the burning of fossil fuels. Comparison of the δ13Cshell record with Contemporaneous proxy archives, over the last millennium, and instrumental data over the twentieth century, highlights that both biological (primary production) and physical environmental factors, such as relative shifts in the proportion of Subpolar Mode Waters and Arctic Intermediate Waters entrained onto the North Icelandic shelf, atmospheric circulation patterns associated with the winter North Atlantic Oscillation, and sea surface temperature and salinity of the subpolar gyre, are the likely mechanisms that contribute to natural variations in seawater δ13C variability on the North Icelandic shelf. Contrasting δ13C fractionation processes associated with these biological and physical mechanisms likely cause the attenuated marine Suess effect signal at this locality. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77687
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom; College of Life and Environmental Sciences, University of Exeter, Penryn, United Kingdom; School of Ocean Sciences, College of Natural Science, Bangor University, Anglesey, United Kingdom; Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA, United States
Recommended Citation:
Reynolds D,J,, Hall I,et al. Biological and Climate Controls on North Atlantic Marine Carbon Dynamics Over the Last Millennium: Insights From an Absolutely Dated Shell-Based Record From the North Icelandic Shelf[J]. Global Biogeochemical Cycles,2017-01-01,31(12)