DOI: 10.1111/gcb.12313
论文题名: A large proportion of north american net ecosystem production is offset by emissions from harvested products, river/stream evasion, and biomass burning
作者: Turner D.P. ; Jacobson A.R. ; Ritts W.D. ; Wang W.L. ; Nemani R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 11 起始页码: 3516
结束页码: 3528
语种: 英语
英文关键词: Atmospheric inversion model
; Biomass burning
; Carbon flux
; Net ecosystem exchange
; Net ecosystem production
; River evasion
Scopus关键词: atmospheric modeling
; biomass burning
; carbon cycle
; carbon dioxide
; carbon emission
; carbon flux
; carbon sink
; concentration (composition)
; net ecosystem exchange
; net ecosystem production
; carbon dioxide
; carbon flux
; agriculture
; article
; atmospheric inversion model
; biomass
; biomass burning
; carbon cycle
; ecosystem
; forestry
; net ecosystem exchange
; net ecosystem production
; North America
; river
; river evasion
; theoretical model
; atmospheric inversion model
; biomass burning
; carbon flux
; net ecosystem exchange
; net ecosystem production
; river evasion
; Agriculture
; Biomass
; Carbon Cycle
; Carbon Dioxide
; Ecosystem
; Forestry
; Models, Theoretical
; North America
; Rivers
英文摘要: Diagnostic carbon cycle models produce estimates of net ecosystem production (NEP, the balance of net primary production and heterotrophic respiration) by integrating information from (i) satellite-based observations of land surface vegetation characteristics; (ii) distributed meteorological data; and (iii) eddy covariance flux tower observations of net ecosystem exchange (NEE) (used in model parameterization). However, a full bottom-up accounting of NEE (the vertical carbon flux) that is suitable for integration with atmosphere-based inversion modeling also includes emissions from decomposition/respiration of harvested forest and agricultural products, CO2 evasion from streams and rivers, and biomass burning. Here, we produce a daily time step NEE for North America for the year 2004 that includes NEP as well as the additional emissions. This NEE product was run in the forward mode through the CarbonTracker inversion setup to evaluate its consistency with CO2 concentration observations. The year 2004 was climatologically favorable for NEP over North America and the continental total was estimated at 1730 ± 370 TgC yr-1 (a carbon sink). Harvested product emissions (316 ± 80 TgC yr-1), river/stream evasion (158 ± 50 TgC yr-1), and fire emissions (142 ± 45 TgC yr-1) counteracted a large proportion (35%) of the NEP sink. Geographic areas with strong carbon sinks included Midwest US croplands, and forested regions of the Northeast, Southeast, and Pacific Northwest. The forward mode run with CarbonTracker produced good agreement between observed and simulated wintertime CO2 concentrations aggregated over eight measurement sites around North America, but overestimates of summertime concentrations that suggested an underestimation of summertime carbon uptake. As terrestrial NEP is the dominant offset to fossil fuel emission over North America, a good understanding of its spatial and temporal variation - as well as the fate of the carbon it sequesters {box drawings light horizontal} is needed for a comprehensive view of the carbon cycle. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62308
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97331, United States; University of Colorado, NOAA Earth System Research Laboratory, Boulder, CO 80305, United States; NASA Ames Research Center, Moffett Field, CA 94035, United States
Recommended Citation:
Turner D.P.,Jacobson A.R.,Ritts W.D.,et al. A large proportion of north american net ecosystem production is offset by emissions from harvested products, river/stream evasion, and biomass burning[J]. Global Change Biology,2013-01-01,19(11)