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: 71
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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: 74
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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: 78
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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: 85
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