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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 107,
4060,
12 PP., 2002
doi:10.1029/2001JD000896
Comparisons of box model calculations and measurements of formaldehyde from the 1997 North Atlantic Regional Experiment
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA
Environmental Chemistry Division, Brookhaven National Laboratory, Upton, New York, USA
Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA
Department of Chemistry, University of Colorado, Boulder, Colorado, USA
Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA
Department of Physics, University of Toronto, Toronto, Ontario, Canada
Centre for Atmospheric Science, Department of Chemistry, Cambridge University, Cambridge, UK
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Centre for Atmospheric Chemistry, Department of Chemistry, York University, York, Ontario, Canada
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Lehrstuhl für Bioklimatologie und Immissionsforschung, Technische Universität München, Freising-Weihenstephan, Germany
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Department of Chemistry, University of Colorado, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Formaldehyde (CH2O) measurements from two independent instruments are compared with photochemical box model calculations. The measurements were made on the National Oceanic and Atmospheric Administration P-3 aircraft as part of the 1997 North Atlantic Regional Experiment (NARE 97). The data set considered here consists of air masses sampled between 0 and 8 km over the North Atlantic Ocean which do not show recent influence from emissions or transport. These air masses therefore should be in photochemical steady state with respect to CH2O when constrained by the other P-3 measurements, and methane oxidation was expected to be the predominant source of CH2O in these air masses. For this data set both instruments measured identical CH2O concentrations to within 40 parts per trillion by volume (pptv) on average over the 0–800 pptv range, although differences larger than the combined 2σ total uncertainty estimates were observed between the two instruments in 11% of the data. Both instruments produced higher CH2O concentrations than the model in more than 90% of this data set, with a median measured-modeled [CH2O] difference of 0.13 or 0.18 ppbv (depending on the instrument), or about a factor of 2. Such large differences cannot be accounted for by varying model input parameters within their respective uncertainty ranges. After examining the possible reasons for the model-measurement discrepancy, we conclude that there are probably one or more additional unknown sources of CH2O in the North Atlantic troposphere.
Published 18 April 2002.
Citation: (2002), Comparisons of box model calculations and measurements of formaldehyde from the 1997 North Atlantic Regional Experiment, J. Geophys. Res., 107(D8), 4060, doi:10.1029/2001JD000896.
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