DOI: 10.1002/gbc.20048
Scopus记录号: 2-s2.0-84879767978
论文题名: Biosphere model simulations of interannual variability in terrestrial 13C/12C exchange
作者: Van Der Velde I ; R ; , Miller J ; B ; , Schaefer K ; , Masarie K ; A ; , Denning S ; , White J ; W ; C ; , Tans P ; P ; , Krol M ; C ; , Peters W
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 637
结束页码: 649
语种: 英语
英文关键词: biogeochemical modeling
; carbon cycle
; carbon isotopes
Scopus关键词: Atmospheric observations
; Biogeochemical modeling
; Biosphere models
; Carbon cycles
; Carbon isotopes
; Interannual variability
; Isotopic fractionations
; Terrestrial biosphere
; Biogeochemistry
; Biospherics
; Budget control
; Carbon
; Computer simulation
; Forestry
; Isotopes
; Lakes
; Productivity
; Carbon dioxide
; air-sea interaction
; annual variation
; carbon budget
; carbon dioxide
; carbon flux
; carbon isotope
; isotopic fractionation
; numerical model
; satellite imagery
英文摘要: Previous studies suggest that a large part of the variability in the atmospheric ratio of 13CO2/12CO 2originates from carbon exchange with the terrestrial biosphere rather than with the oceans. Since this variability is used to quantitatively partition the total carbon sink, we here investigate the contribution of interannual variability (IAV) in biospheric exchange to the observed atmospheric 13C variations. We use the Simple Biosphere - Carnegie-Ames-Stanford Approach biogeochemical model, including a detailed isotopic fractionation scheme, separate 12C and 13C biogeochemical pools, and satellite-observed fire disturbances. This model of 12CO2 and 13CO2 thus also produces return fluxes of 13CO2from its differently aged pools, contributing to the so-called disequilibrium flux. Our simulated terrestrial 13C budget closely resembles previously published model results for plant discrimination and disequilibrium fluxes and similarly suggests that variations in C 3 discrimination and year-to-year variations in C3and C4 productivity are the main drivers of their IAV. But the year-to-year variability in the isotopic disequilibrium flux is much lower (1σ=±1.5 PgC ‰ yr-1) than required (±12.5 PgC ‰ yr-1) to match atmospheric observations, under the common assumption of low variability in net ocean CO2 fluxes. This contrasts with earlier published results. It is currently unclear how to increase IAV in these drivers suggesting that SiBCASA still misses processes that enhance variability in plant discrimination and relative C 3/C4productivity. Alternatively, 13C budget terms other than terrestrial disequilibrium fluxes, including possibly the atmospheric growth rate, must have significantly different IAV in order to close the atmospheric 13C budget on a year-to-year basis. ©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/77636
Appears in Collections: 气候变化事实与影响
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作者单位: Meteorology and Air Quality, Wageningen University, P.O. Box 47, 6700 AA Wageningen, Netherlands; NOAA Earth System Research Laboratory, Boulder, CO, United States; CIRES, University of Colorado, Boulder, CO, United States; National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; INSTAAR, University of Colorado, Boulder, CO, United States; IMAU, Utrecht University, Utrecht, Netherlands
Recommended Citation:
Van Der Velde I,R,, Miller J,et al. Biosphere model simulations of interannual variability in terrestrial 13C/12C exchange[J]. Global Biogeochemical Cycles,2013-01-01,27(3)