DOI: 10.1029/2018GB006110
论文题名: Large Contribution of Pteropods to Shallow CaCO3 Export
作者: Buitenhuis E.T. ; Le Quéré C. ; Bednaršek N. ; Schiebel R.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 3 语种: 英语
英文关键词: aragonite
; biogeochemical cycle
; calcification
; calcite
; calcium carbonate
; dissolution
; echinococcosis
; foraminifera
; global ocean
; sediment trap
; Foraminifera
; Haptophyceae
; Pteropoda
中文摘要: The literature on the relative contributions of pelagic calcifying taxa to the global ocean export of CaCO3 is divided. Studies based on deep sediment trap data tend to argue that either foraminifers or coccolithophores, both calcite producers, dominate export. However, the compilations of biomass observations for pteropods, coccolithophores, and foraminifers instead show that pteropods dominate the global ocean calcifier biomass and therefore likely also carbonate export. Here we present a new global ocean biogeochemical model that explicitly represents these three groups of pelagic calcifiers. We synthesize databases of the physiology of the three groups to parameterize the model and then tune the unconstrained parameters to reproduce the observations of calcifier biomass and CaCO3 export. The model can reproduce both these observational databases; however, substantial dissolution of aragonite above the aragonite saturation horizon is required to do so. We estimate a contribution of pteropods to shallow (100 m) export of CaCO3 of at least 33% and to pelagic calcification of up to 89%. The high production-high dissolution configuration that shows closest agreement with all the observations has a CaCO3 production of 4.7 Pg C/year but CaCO3 export at 100 m of only 0.6 Pg C/year. ©2019. 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/160137
Appears in Collections: 气候变化与战略
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作者单位: Tyndall Centre for Climate Change Research, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Southern California Coastal Water Research Authority, Costa Mesa, CA, United States; Department of Climate Geochemistry, Max Planck Institute for Chemistry, Mainz, Germany
Recommended Citation:
Buitenhuis E.T.,Le Quéré C.,Bednaršek N.,et al. Large Contribution of Pteropods to Shallow CaCO3 Export[J]. Global Biogeochemical Cycles,2019-01-01,33(3)