Terrestrial biospheric response to atmospheric CO[sub 2] and the [open quotes]missing carbon[close quotes]
Conference
·
· Bulletin of the Ecological Society of America; (United States)
OSTI ID:6246008
- Oak Ridge National Lab., TN (United States)
Part of the CO[sub 2] released to the atmosphere by the global use of fossil fuels remains unaccounted for in observations of atmospheric CO[sub 2] or model estimates of carbon uptake by the world's oceans. CO[sub 2] stimulation of terrestrial net primary production (NPP) has been proposed as a mechanism to account for this [open quotes]missing carbon[close quotes]. To assess this proposition, we use a global model of carbon dynamics in terrestrial ecosystems. Plant growth is a logistic function of vegetation carbon density. We model the CO[sub 2] response of NPP as a logarithmic function of increasing atmospheric CO[sub 2] (the classic response function of global carbon cycle models) and as a more physiologically justified rectangular hyperbolic response. We derive parameters for these functions from experimental studies of plant response to suggest a recent upper limit on CO[sub 2] stimulated terrestrial carbon storage of [approx]0.5 Gt C yr[sup [minus]1] and a maximum CO[sub 2] enhance storage is sufficient to account for the [open quotes]missing[close quotes] fossil fuel carbon releases, but it is sufficient to also account for most estimates of the additional carbon released by changes in land use.
- OSTI ID:
- 6246008
- Report Number(s):
- CONF-930798--
- Conference Information:
- Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 74:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ATMOSPHERIC CHEMISTRY
BIOSPHERE
CARBON COMPOUNDS
CARBON CYCLE
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
ECOSYSTEMS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GLOBAL ASPECTS
GROWTH
LAND USE
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PLANT GROWTH
SEAS
SURFACE WATERS
TERRESTRIAL ECOSYSTEMS
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ATMOSPHERIC CHEMISTRY
BIOSPHERE
CARBON COMPOUNDS
CARBON CYCLE
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
ECOSYSTEMS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GLOBAL ASPECTS
GROWTH
LAND USE
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PLANT GROWTH
SEAS
SURFACE WATERS
TERRESTRIAL ECOSYSTEMS