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NARSTO Workshop on Innovative Methods for Emission Inventory Development and Evaluation University of Texas, Austin October 14-17, 2003 |
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Assessing Anthropogenic Emissions Inventories Using Measurements From Aircraft
Assessing Anthropogenic Emissions Inventories Using Measurements From Aircraft
T.B. Ryerson, F.C. Fehsenfeld, J.S. Holloway, D.D. Parrish, and M. Trainer
NOAA Aeronomy Laboratory, Boulder, CO
E.L. Atlas, S.G. Donnelly, S. Schauffler, and V. Stroud
NCAR Atmospheric Chemistry Division, Boulder, CO
Near-field airborne measurements downwind of anthropogenic point and area sources can provide an independent assessment of emissions inventory values for NOx, CO, CO2, SO2, and a wide variety of VOCs. The accuracy of emissions ratios determined from aircraft data can be quite high, with uncertainties determined by instrumental calibrations uncertainties, typically ±5-10%. Absolute emission rates from point sources can also be determined with uncertainties of approximately ±20% or better under optimal meteorological conditions. Comparison of aircraft estimates to inventory values for urban, power plant, petrochemical industrial, and marine diesel emissions will be presented. In general, emissions from point sources equipped with continuous emissions monitoring systems (CEMS) are accurately estimated in the inventories, but significant discrepancies exist for other anthropogenic source types.