DOI: 10.1002/2013GB004684
Scopus记录号: 2-s2.0-84888799271
论文题名: Temperature-dependent remineralization in a warming ocean increases surface pCO2 through changes in marine ecosystem composition
作者: Segschneider J ; , Bendtsen J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1214
结束页码: 1225
语种: 英语
英文关键词: carbon cycle
; climate change
; ecosystem
; ocean
; remineralization
Scopus关键词: Carbon cycles
; Coupled Model Intercomparison Project
; Future climate projections
; Marine biogeochemistries
; ocean
; Oceanic uptake of anthropogenic co
; Particulate organic carbon
; Remineralization
; Biogeochemistry
; Biological materials
; Carbon
; Carbon dioxide
; Climate change
; Ecosystems
; Feedback
; Organic compounds
; pH
; Silicates
; Climate models
; calcite
; carbon cycle
; carbon dioxide
; chemical composition
; climate prediction
; concentration (composition)
; marine ecosystem
; organic matter
; remineralization
; Bacillariophyta
英文摘要: Temperature-dependent remineralization of organic matter is, in general, not included in marine biogeochemistry models currently used for Coupled Model Intercomparison Project Phase 5 (CMIP5) climate projections. Associated feedbacks have therefore not been quantified. In this study we aim at investigating how temperature-dependent remineralization rates (Q10 = 2) in a warming ocean impact on the marine carbon cycle, and if this may weaken the oceanic sink for anthropogenic CO2. We perturb an Earth system model used for CMIP5 with temperature-dependent remineralization rates of organic matter using representative concentration pathway (RCP)8.5-derived temperature anomalies for 2100. The result is a modest change of organic carbon export but also derived effects associated with feedback processes between changed nutrient concentrations and ecosystem structure. As more nutrients are recycled in the euphotic layer, increased primary production causes a depletion of silicate in the surface layer as opal is exported to depth more efficiently than particulate organic carbon. Shifts in the ecosystem occur as diatoms find less favorable conditions. Export production of calcite shells increases causing a decrease in alkalinity and higher surface pCO2. With regard to future climate projections, the results indicate a reduction of oceanic uptake of anthropogenic CO2 of about 0.2 PgC yr-1 toward the end of the 21st century in addition to reductions caused by already identified climate-carbon cycle feedbacks. Similar shifts in the ecosystem as identified here, but driven by external forcing, have been proposed to drive glacial/interglacial changes in atmospheric pCO2. We propose a similar positive feedback between climate perturbations and the global carbon cycle but driven solely by internal biogeochemical processes. Key Points Temperature-dependent remineralization included in an Earth System Model Changes in marine ecosystem cause alkalinity-driven release of carbon Oceanic carbon sink additionally reduced by 0.2 GtC per year by 2100 ©2013. 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/77555
Appears in Collections: 气候变化事实与影响
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作者单位: Max Planck Institute for Meteorology, Bundesstr. 53, D-20146 Hamburg, Germany; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Climate Lab, Copenhagen, Denmark
Recommended Citation:
Segschneider J,, Bendtsen J. Temperature-dependent remineralization in a warming ocean increases surface pCO2 through changes in marine ecosystem composition[J]. Global Biogeochemical Cycles,2013-01-01,27(4)