DOI: 10.1002/2014GB005063
Scopus记录号: 2-s2.0-84939264899
论文题名: A new look at ocean carbon remineralization for estimating deepwater sequestration
作者: Guidi L ; , Legendre L ; , Reygondeau G ; , Uitz J ; , Stemmann L ; , Henson S ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 7 起始页码: 1044
结束页码: 1059
语种: 英语
英文关键词: carbon
; ocean
; remineralization
; sequestration
Scopus关键词: biogeochemistry
; biological pump
; carbon dioxide
; carbon flux
; carbon sequestration
; concentration (composition)
; deep water
; estimation method
; flux measurement
; organic matter
; particulate organic carbon
; phytoplankton
; pycnocline
; remineralization
; surface water
; upper ocean
; water column
英文摘要: The "biological carbon pump" causes carbon sequestration in deep waters by downward transfer of organic matter, mostly as particles. This mechanism depends to a great extent on the uptake of CO2 by marine plankton in surface waters and subsequent sinking of particulate organic carbon (POC) through the water column. Most of the sinking POC is remineralized during its downward transit, and modest changes in remineralization have substantial feedback on atmospheric CO2 concentrations, but little is known about global variability in remineralization. Here we assess this variability based on modern underwater particle imaging combined with field POC flux data and discuss the potential sources of variations. We show a significant relationship between remineralization and the size structure of the phytoplankton assemblage. We obtain the first regionalized estimates of remineralization in biogeochemical provinces, where these estimates range between -50 and +100% of the commonly used globally uniform remineralization value. We apply the regionalized values to satellite-derived estimates of upper ocean POC export to calculate regionalized and ocean-wide deep carbon fluxes and sequestration. The resulting value of global organic carbon sequestration at 2000 m is 0.33 Pg C yr-1, and 0.72 Pg C yr-1 at the depth of the top of the permanent pycnocline, which is up to 3 times higher than the value resulting from the commonly used approach based on uniform remineralization and constant sequestration depth. These results stress that variable remineralization and sequestration depth should be used to model ocean carbon sequestration and feedback on the atmosphere. ©2015. 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/77959
Appears in Collections: 气候变化事实与影响
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作者单位: Sorbonne Universités, UPMC Université Paris 06, CNRS, Laboratoire d'oceanographie de Villefranche (LOV), Observatoire Océanologique, Villefranche-sur-Mer, France; Department of Oceanography, University of Hawaii, Honolulu, Hawaii, United States; Center for Macroecology, Evolution and Climate, National Institute for Aquatic Resources, Technical University of Denmark (DTU Aqua), Charlottenlund, Denmark; Fisheries Centre, University of British Columbia, Aquatic Ecosystems Research Laboratory, Vancouver, Canada; National Oceanography Centre, European Way, Southampton, United Kingdom
Recommended Citation:
Guidi L,, Legendre L,, Reygondeau G,et al. A new look at ocean carbon remineralization for estimating deepwater sequestration[J]. Global Biogeochemical Cycles,2015-01-01,29(7)