DOI: 10.1002/2015GB005246
Scopus记录号: 2-s2.0-84975736361
论文题名: Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean
作者: Humphreys M ; P ; , Griffiths A ; M ; , Achterberg E ; P ; , Holliday N ; P ; , Rérolle V ; M ; C ; , Menzel Barraqueta J ; -L ; , Couldrey M ; P ; , Oliver K ; I ; C ; , Hartman S ; E ; , Esposito M ; , Boyce A ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 293
结束页码: 310
语种: 英语
英文关键词: anthropogenic carbon dioxide
; dissolved inorganic carbon
; Extended Ellett Line
; North Atlantic subpolar gyre
; Suess effect
; time series
Scopus关键词: accumulation rate
; alkalinity
; anthropogenic source
; atmospheric chemistry
; biogeochemical cycle
; biogeochemistry
; carbon dioxide
; data acquisition
; dissolved inorganic carbon
; gyre
; heterogeneity
; isotopic composition
; remineralization
; spatiotemporal analysis
; thermohaline circulation
; time series
; water column
; Arctic Ocean
; Atlantic Ocean
; Atlantic Ocean
; Atlantic Ocean (North)
; Norwegian Sea
英文摘要: Marine carbonate chemistry measurements have been carried out annually since 2009 during UK research cruises along the Extended Ellett Line (EEL), a hydrographic transect in the northeast Atlantic Ocean. The EEL intersects several water masses that are key to the global thermohaline circulation, and therefore the cruises sample a region in which it is critical to monitor secular physical and biogeochemical changes. We have combined results from these EEL cruises with existing quality-controlled observational data syntheses to produce a hydrographic time series for the EEL from 1981 to 2013. This reveals multidecadal increases in dissolved inorganic carbon (DIC) throughout the water column, with a near-surface maximum rate of 1.80 ± 0.45 μmol kg-1 yr-1. Anthropogenic CO2 accumulation was assessed, using simultaneous changes in apparent oxygen utilization (AOU) and total alkalinity (TA) as proxies for the biogeochemical processes that influence DIC. The stable carbon isotope composition of DIC (δ13CDIC) was also determined and used as an independent test of our method. We calculated a volume-integrated anthropogenic CO2 accumulation rate of 2.8 ± 0.4 mg C m-3 yr-1 along the EEL, which is about double the global mean. The anthropogenic CO2 component accounts for only 31 ± 6% of the total DIC increase. The remainder is derived from increased organic matter remineralization, which we attribute to the lateral redistribution of water masses that accompanies subpolar gyre contraction. Output from a general circulation ecosystem model demonstrates that spatiotemporal heterogeneity in the observations has not significantly biased our multidecadal rate of change calculations and indicates that the EEL observations have been tracking distal changes in the surrounding North Atlantic and Nordic Seas. ©2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77885
Appears in Collections: 气候变化事实与影响
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作者单位: Ocean and Earth Science, University of Southampton, Southampton, United Kingdom; Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany; National Oceanography Centre, Southampton, United Kingdom; Sorbonne Universités, UPMC, University of Paris 06, CNRS, IRD-MNHN, LOCEAN Laboratory, Paris, France; Scottish Universities Environmental Research Centre, East Kilbride, United Kingdom
Recommended Citation:
Humphreys M,P,, Griffiths A,et al. Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean[J]. Global Biogeochemical Cycles,2016-01-01,30(2)