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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Using Inverse Modelling to Investigate Potential IR Measurement Strategies for Constraining the Aust
Description: This study employs a top-down approach to better understanding the carbon cycle. Fourier Transform Spectroscopic trace gas measurements are combined with inverse modelling. Possible measurement locations and strategies in the Australian continent are investigated. This is done by simulating data for the potential measurement locations, and using this simulated pseudodata in inversion studies to determine the additional constraint applied to the source estimate uncertainty in Australia and nearby regions.
Author's Names: NM Deutscher; RM Law; DWT Griffith; GW Bryant
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Added on: 25-Sep-2005 Downloads: 50
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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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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
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Added on: 25-Sep-2005 Downloads: 52
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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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Synthesis of Top-Down and Bottom-Up Scaling of Regional Terrestrial Carbon Dioxide Fluxes
Description: Regional exchange of CO2 in the upper Midwest, USA was investigated with several different bottom-up and
top-down methods. With careful calibration, encouraging consistency is seen
from several independent regional flux estimates.
Author's Names: Ankur R Desai
Filesize: 621.91 Kb
Added on: 26-Sep-2005 Downloads: 51
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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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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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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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Using continental, continuous CO2 observations in a time-dependent global inversion to infer regiona
Description: Simulation of mid boundary layer CO2 mixing ratios from observations
routinely collected at flux tower sites (tower top well-calibrated CO2
mixing ratio, CO2 flux, sensible heat flux and temperature), providing
a means of extending the CO2 measurement to improve the density of
continental measurements in the global network.
Author's Names: Martha Butler
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Added on: 27-Sep-2005 Downloads: 61
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