UNCERTAINTIES IN TERRESTRIAL CARBON CYCLE INTERACTION WITH A WARMER CLIMATE
Description:
Results from recent models in the coupled carbon cycle
climate model intercomparison project (C4MIP) indicate a positive feedback to
global warming from the interactive carbon cycle, but the magnitude varies
widely. A typical model simulates an additional increase of 90 ppmv in the
atmospheric CO2, and 0.6 degree additional warming due to this
feedback, but some model can be as large as 250ppm. Using a liner perturbation
framework, we analyze what might have caused such large discrepancy in the
models, with a focus on land where the largest uncertainties lie. Change in NPP
such as different sensitivity to the CO2 fertilization effect is one
where in some models it is modest largely due to the multiple limiting factors
constraining terrestrial productivity and carbon loss. The large differences
among the models are also manifestations of other poorly constrained processes
such as the turnover time and rates of soil decomposition.
Author's Names: N. Zeng, H. Qian, E. Munoz and R. Iacono
Filesize: 11.58 Kb
Added on: 09-Aug-2005 Downloads: 30
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SYNERGISM OF TERRESTRIAL CARBON CYCLE FEEDBACKS IN SIMULATIONS OF FUTURE CLIMATE CHANGE
Description: This paper examines two key feedbacks that
operate between the terrestrial carbon cycle, atmospheric carbon dioxide (CO2)
and climate: the positive carbon cycle-climate feedback and the negative CO2
fertilization feedback. Both feedbacks
affect strongly the growth rate of future atmospheric CO2, and
interact in such a way that the effect of one is notably modified in the
absence of the other.
Author's Names: H.D. Matthews
Filesize: 76.93 Kb
Added on: 16-Sep-2005 Downloads: 20
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SIMULATION OF WATER AND CARBON FLUXES USING BIOME-BGC OVER VARIOUS ECOSYSTEMS IN CHINA
Description: This study was conducted for
exploring the ability of the BIOME-BGC for various ecosystems in
China For this propose we set up five eddy-covariance towers in 2002.
By using these observation data, we modified eco-physiological
parameters in the model. Correspondence between the simulated results
with observations suggested that the modified model can be used to
predict plant growth as well as water (H2O) and carbon
(CO2) fluxes under the consideration of the effects of
anthropogenic forcing. Results showed that anthropogenic forcing had
an apparent effect on the water and carbon fluxes and sequestration
capacity.
Author's Names: WANG Qinxue, WATANABE Masataka
Filesize: 0 bytes
Added on: 20-Sep-2005 Downloads: 45
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