OBSERVATIONAL DATA SCREENING TECHNIQUE USING ATMOSPHERIC TRANSPORT MODEL AND INVERSE MODEL IN ...
Description: We
have developed a new data screening technique using an atmospheric transport
model and an inverse model. Using this technique, we can use original (not
smoothed) observational data for the inversion method. This means that we can
enlarge the number of observational data for inversion method and we can
estimate carbon dioxide (CO2) flux history consistently in long period
in accordance with the number of the observational sites.
Author's Names: Takashi MAKI
Filesize: 742 bytes
Added on: 28-Sep-2005 Downloads: 58
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A Bayesian synthesis inversion of the global carbon cycle: How observations reduce uncertainties
Description: Global-scale observations of CO2 concentrations and fluxes are
assimilated by a simple carbon cycle model in order to produce full
probability density functions of 4 key carbon cycle parameters using
the Markov Chain Monte Carlo technique. Future sink uncertainty
is estimated under the S550 stabilization scenario, and the utility of
additional flux observations to reduce sink uncertainty is analyzed.
Author's Names: Daniel Ricciuto
Filesize: 1.62 MB
Added on: 29-Sep-2005 Downloads: 57
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A Paleo Perspective on the Ocean's Role in the Carbon Cycle
Description: The ocean has a dominant influence on carbon dioxide in the atompshere,
and ocean processes change slowly (centuries to thousands of
years). Paleo reconstructions of the large natural changes that
have occurred in the past provide a way to understand the ocean's role.
Author's Names: David M. Anderson
Filesize: 1.82 MB
Added on: 05-Oct-2005 Downloads: 27
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Air-Sea Flux of Carbon Dioxide in the Costal Eastern Pacific
Description: This project seeks to first quantify and then understand the magnitude,
spatial pattern, and variability of air-sea carbon dioxide (CO2) flux
in the costal waters of the eastern Pacific.
Author's Names: Gernot Friederich
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Added on: 27-Sep-2005 Downloads: 84
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Carbon isotope evidence for the latitudinal distribution of air-sea gas exchange
Description: The
air-sea gas exchange rate is important for modeling and verifying ocean CO2
uptake, but remains subject to considerable uncertainty. The widely assumed
quadratic or cubic dependence of the exchange rate on windspeed together with
the latitudinal pattern of mean windspeed implies that exchange is much faster
at high compared with low latitudes. This should affect the pattern of ocean
uptake of bomb carbon-14 as well as the rate of decline of and latitudinal
gradients in atmospheric Δ14CO2. We evaluate the
constraints on the windspeed dependence of the exchange rate offered by
available isotopic measurements, discuss the major uncertainties, and suggest
observational strategies to reduce these uncertainties.
Author's Names: N. Y. Krakauer, J. T. Randerson, F. W. Primeau
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Added on: 25-Sep-2005 Downloads: 73
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Continuous In Situ Measurements of Atmospheric O2 and CO2 at Harvard Forest
Description: Simultaneous
and continuous measurements of O2 and CO2 made in
the air around terrestrial ecosystems have the potential to improve our
understanding of the biogeochemistry of the ecosystem, and may reduce
uncertainties in estimates of terrestrial carbon uptake derived from
atmospheric O2 measurements. Following the
design of Stephens et al. [2001], we
have constructed an instrument that performs continuous in situ measurements of atmospheric O2 and CO2
concentrations. We present design and performance data, along with preliminary
results from a deployment at the Environmental Measurement Site at Harvard Forest
in central Massachusetts.
Author's Names: Mark Battle
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Added on: 26-Sep-2005 Downloads: 70
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Effect of Enriched CO2 on Rice Under Open Top Chamber (OTC) Condition in Nepal
Description: Rise is the most important crop for majority of farmers of Nepal both
in terms of it contribution to the national economy and
employment. The objective of this study was to evaulate the
effect of the elevated CO2 on rice crop under open top chambe (OTC)
condition.
Author's Names: Kishore Sherchand
Filesize: 200 bytes
Added on: 25-Sep-2005 Downloads: 51
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IMPACT OF ELEVATED CO2 ON THE FOOD PRODUCTION OF NEPAL
Description: The three cereal crops rise, maize and wheat cover over 75% of the
total food production of Nepal. All the three crops rise, maize
and wheat showed increased yield with doubling the CO2 level but also
showed a declining tendecny at the elevated temperature. Among
the three crops, maize was the most affected by the rise in
tempuerature although increased CO2 level could increase the crop yield.
Author's Names: Kishore Sherchand
Filesize: 200 bytes
Added on: 25-Sep-2005 Downloads: 52
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Interannual variability in Atmospheric Potential Oxygen
Description: pdf file of Hamme, Keeling and Paplawsky poster for ICDC7.
Author's Names: RC Hamme, RF Keeling, WJ Paplawsky
Filesize: 4.58 MB
Added on: 22-Sep-2005 Downloads: 77
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Measurements and Models of Atmospheric Potential Oxygen (APO)
Description: Measurements of atmospheric O2/N2
ratios and CO2 concentrations can be combined to form the tracer
Atmospheric Potential Oxygen (APO), reflecting primarily ocean biogeochemistry
and atmospheric circulation. Building on the work of Stephens et al. [1998], we present a new set of APO observations including shipboard collections from the
equatorial Pacific. Our data show a
smaller interhemispheric gradient than observed in past studies and a
substantial APO maximum around the
equator. Following a modeling approach
developed by Gruber et al. [2001], we
compare these observations with APO fields
generated by a set of oceanic and atmospheric models. Overall, our model results agree well with
observations, but small differences suggest that modeled north-south transport
may be too vigorous, air-sea fluxes may be too coarsely resolved in some
regions, and seasonal trapping of surface fluxes may be excessive in some model
locations.
Author's Names: Mark Battle
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Added on: 26-Sep-2005 Downloads: 52
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