HR: 0800h
AN: B41B-0465    [Abstracts]
TI: Carbon Fluxes From Land-Use Change and Forestry: A Multi-Model Study
AU: * Ito, A
EM: akinorii@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001, Japan
AU: Pires De Campos, C
EM: ch.campos@petrobras.com.br
AF: Petrobras Research & Development Center, Av. Horácio de Macedo, 950, sala 9009A, Rio de Janeiro, 21941-915, Brazil
AU: Penner, J E
EM: penner@umich.edu
AF: University of Michigan, 2455 Hayward, Ann Arbor, MI 48109-2143, United States
AU: Prather, M J
EM: mprather@uci.edu
AF: University of California at Irvine, 3329 Croul Hall, Irvine, CA 92697-3100, United States
AU: Jung, M
EM: m.jung@ecofys.de
AF: Ecofys, Eupener Str. 59, Cologne, 50933, Germany
AU: Houghton, R A
EM: rhoughton@whrc.org
AF: Woods Hole Research Center, 149 Woods Hole Road, Falmouth, MA 02540-1644, United States
AU: Kato, T
EM: t_kato@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001, Japan
AU: Jain, A K
EM: jain@atmos.uiuc.edu
AF: University of IllinoisCenter, 105 South Gregory Street, Urbana, IL 61801, United States
AU: Yang, X
EM: xyang5@uiuc.edu
AF: University of IllinoisCenter, 105 South Gregory Street, Urbana, IL 61801, United States
AU: Hurtt, G C
EM: george.hurtt@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824-3525, United States
AU: Frolking, S
EM: steve.frolking@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824-3525, United States
AU: Fearon, M G
EM: matt@guero.sr.unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824-3525, United States
AU: Wang, A
EM: AWang@NRCan.gc.ca
AF: University of Alberta, 751 General Services Building, Edmonton, T6G 2H1, Canada
AB: The impact of land-use change and land management on global carbon fluxes is assessed using a variety of models of different types with different land cover change maps. Annual carbon fluxes are disaggregated into different land-use change processes and carbon pools in separate geographical regions. Biogeochemical modeling studies estimate the impacts of CO₂ fertilization and climate change in addition to land use change but did not include some activities which are considered in book-keeping approaches. We perform a detailed analysis for USA. The USA is chosen because of the disparity between the detailed UNFCCC estimates and the model-based estimates. Major differences between different data sets are found in the litter and soil organic matter components for the USA, although the differences are much smaller than those in the tropics. Combining the book-keeping modeling results with the process-based biogeochemical modeling estimates yields a consensus of bottom-up and top-down estimates. Our results indicate that extra-tropical land regions are net weak sink of carbon and the tropics are net small source in the 1990s.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0428 Carbon cycling (4806)
DE: 0466 Modeling
DE: 0490 Trace gases
SC: Biogeosciences [B]
MN: 2007 Fall Meeting