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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents

ID: 18176.0, MPI für Chemie / Publikationen MPI für Chemie
Comparisons of box model calculations and measurements of formaldehyde from the 1997 North Atlantic Regional Experiment
Authors:Frost, G. J.; Fried, A.; Lee, Y. N.; Wert, B.; Henry, B.; Drummond, J. R.; Evans, M. J.; Fehsenfeld, F. C.; Goldan, P. D.; Holloway, J. S.; Hübler, G.; Jakoubek, R.; Jobson, B. T.; Knapp, K.; Kuster, W. C.; Roberts, J.; Rudolph, J.; Ryerson, T. B.; Stohl, A.; Stroud, C.; Sueper, D. T.; Trainer, M.; Williams, J.
Date of Publication (YYYY-MM-DD):2002-04
Title of Journal:Journal of Geophysical Research
Journal Abbrev.:J. Geophys. Res.
Issue / Number:D7-D8
Sequence Number of Article:4060
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:[1] 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 2 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.
Free Keywords:formaldehyde; photochemical modeling; aircraft measurements; North Atlantic troposphere
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie/Chemie der Atmosphäre
External Affiliations:NOAA, Aeron Lab, 325 Broadway, Boulder, CO 80303 USA; Univ Toronto, Dept Phys, Toronto, ON M5S 1A1, Canada; Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA; NCAR, Div Atmospher Chem, Boulder, CO 80305 USA; Pacific NW Natl Lab, Richland, WA 99352 USA; Penn State Univ, Dept Chem, York, PA 17403 USA; Brookhaven Natl Lab, Environm Chem Div, Upton, NY 11973 USA; York Univ, Dept Chem, Ctr Atmospher Chem, N York, ON M3J 1P3, Canada; Tech Univ Munich, Lehrstuhl Bioklimatol & Immissionsforsch, D-85354 Munich, Germany; Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; Univ Colorado, Dept Chem, Boulder, CO 80309 USA
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