NEW COUPLED CLIMATE-CARBON SIMULATIONS WITH THE IPSL MODEL: FROM VALIDATION WITH ATMOSPHERIC ...
Description: We have developed a
Climate-Carbon coupled model based on the IPSL OAGCM and on two biogeochemical
models, ORCHIDEE for the continent and PISCES for the ocean, to investigate the
coupling between climate change and the global carbon cycle. We have performed
four climate-carbon simulations over the 1860-2100 period in which atmospheric
CO2 is interactively calculated. They are :
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A control coupled
simulation with no anthropogenic emissions.
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A coupled
simulation with anthropogenic emissions.
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A coupled
simulation with anthropogenic emissions including non-CO2 greenhouse
and sulfate aerosols.
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An uncoupled
carbon simulation with the same anthropogenic emissions as second simulation
but for which atmospheric CO2 change has no impact on climate.
Compared to the first IPSL
Climate-Carbon coupled model [Dufresne,
et al., 2002], the simple carbon models have been replaced by IPSL advanced
ocean and land biogeochemical models, respectively PISCES and ORCHIDEE. CO2
is transported in the atmosphere and compared with observations. Comparison
with satellite data is also done. We then analyze the coupled and uncoupled
simulations, highlight the importance of the climate change both on the oceanic
and biosphere sink and estimate the climate-carbon feedback. The results are
also compared to the outputs of other models participating in the C4MIP
inter-comparison project. Finally, off-line simulations are carried out to
perform sensitivity tests (fire, dynamics of land and ocean ecosystems, soil
respiration) in order to identify the key processes which govern the simulated
response.
Filesize: 35.21 Kb
Added on: 27-Jul-2005 Downloads: 183
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Category: Abstracts/Carbon Cycle Response to Environmental Change
EUROPEAN-WIDE REDUCTION IN PRIMARY PRODUCTIVITY CAUSED BY THE HEAT AND DROUGHT IN 2003
Description:
Future climate warming is expected to enhance plant
growth in temperate ecosystems and to increase carbon sequestration. But
although severe regional heatwaves may become more frequent in a changing
climate, and their impact on terrestrial carbon cycling is unclear. Europe experienced a particularly extreme climate anomaly
during 2003, with July temperatures up to 6°C above long-term means, and annual
precipitation deficits up to 300 mmy-1, that is 50% below the
average. We used the 2003 heatwave as a ‘laboratory assistant’ to estimate the
impact on terrestrial carbon cycling.
Filesize: 23.98 Kb
Added on: 28-Jul-2005 Downloads: 180
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Category: Abstracts/Carbon Cycle Response to Environmental Change
ROLE OF AGRICULTURAL MANAGEMENT IN MITIGATING GREENHOUSE EMISSIONS
Description: Analyses of
Northern Hemisphere carbon fluxes indicate that a number of ecosystem processes
jointly contribute to source and sink exchanges of CO2 which affect
the net carbon sequestered from the atmosphere. These processes (e.g., CO2,
N2O, CH4, and H2O dynamics) exhibit high
variability in time and space with the largest variability corresponding to
human land management events. Therefore, the spatial and temporal incorporation
of land management information is needed to properly represent net carbon and
other GHG fluxes.
Filesize: 34.12 Kb
Added on: 03-Aug-2005 Downloads: 175
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Category: Abstracts/Managing the Carbon Cycle