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CO, NO x and 13 CO 2 as tracers for fossil fuel CO 2 : results from a pilot study in Paris during winter 2010

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TLDR
In this paper, measurements of the mole fraction of the CO2 and its isotopes were performed in Paris during the MEGAPOLI winter campaign (January-February 2010) to identify the relative contributions of 77% CO2 from fossil fuel consumption and 23% from biospheric CO2 (CO2 from the use of bio fuels and from human and plant respiration: CO2bio).
Abstract
. Measurements of the mole fraction of the CO2 and its isotopes were performed in Paris during the MEGAPOLI winter campaign (January–February 2010). Radiocarbon (14CO2) measurements were used to identify the relative contributions of 77% CO2 from fossil fuel consumption (CO2ff from liquid and gas combustion) and 23% from biospheric CO2 (CO2 from the use of biofuels and from human and plant respiration: CO2bio). These percentages correspond to average mole fractions of 26.4 ppm and 8.2 ppm for CO2ff and CO2bio, respectively. The 13CO2 analysis indicated that gas and liquid fuel contributed 70% and 30%, respectively, of the CO2 emission from fossil fuel use. Continuous measurements of CO and NOx and the ratios CO/CO2ff and NOx/CO2ff derived from radiocarbon measurements during four days make it possible to estimate the fossil fuel CO2 contribution over the entire campaign. The ratios CO/CO2ff and NOx/CO2ff are functions of air mass origin and exhibited daily ranges of 7.9 to 14.5 ppb ppm−1 and 1.1 to 4.3 ppb ppm−1, respectively. These ratios are consistent with different emission inventories given the uncertainties of the different approaches. By using both tracers to derive the fossil fuel CO2, we observed similar diurnal cycles with two maxima during rush hour traffic.

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An attempt at estimating Paris area CO 2 emissions from atmospheric concentration measurements

TL;DR: In this article, atmospheric inversion is used to adjust the daily to monthly budget of fossil fuel CO2 emissions of the Paris urban area from the prior estimates established by the Airparif local air quality agency.
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Toward consistency between trends in bottom-up CO 2 emissions and top-down atmospheric measurements in the Los Angeles megacity

TL;DR: In this paper, the authors determined time series for CO2 contributions from fossil fuel combustion (Cff) for both sites and broken those down into contributions from petroleum and/or gasoline and natural gas burning for Pasadena.
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A review of the current progress in quantifying the potential of urban forests to mitigate urban CO2 emissions

TL;DR: In this paper, the authors examined the methods currently used to quantify carbon pools and CO2 fluxes of urban forests, and compiles currently available results, showing that vegetation did not offset CO2 emissions on an annual basis in studies from mid-latitude cities.
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Temporal variations of atmospheric CO 2 and CO at Ahmedabad in western India

TL;DR: In this paper, the authors used a laser-based cavity ring down spectroscopy technique to study the diurnal and seasonal variations in atmospheric CO2 with respect to its sources (both anthropogenic and biospheric) and sinks.
References
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Journal ArticleDOI

Characterizing aquatic dissolved organic matter.

TL;DR: In this article, standards for reporting C-14 age determinations are discussed, and the statistical uncertainty (plus or minus one standard deviation) expresses counting errors, inaccuracies in voltage, pressure, temperature, dilution, and should include errors in C-13 ratios.
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The concentration and isotopic abundances of atmospheric carbon dioxide in rural areas

TL;DR: In this article, the isotopic abundances of C13 and O18 were analyzed for carbon dioxide reporting, in addition to concentration in air, in order to explain the correlation observed for all samples between C13 isotope abundance and concentration of carbon dioxide in air.
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Regional Changes in Carbon Dioxide Fluxes of Land and Oceans Since 1980

TL;DR: An inverse model to 20 years of atmospheric carbon dioxide measurements is applied to infer yearly changes in the regional carbon balance of oceans and continents and indicates that global terrestrial carbon fluxes were approximately twice as variable as ocean fluxes between 1980 and 1998.
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