The vertical distribution of tropospheric ammonia

Details The vertical distribution of tropospheric ammonia The vertical distribution of tropospheric ammonia

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..317l&link_type=abstract

Geophysical Research Letters, vol. 7, May 1980, p. 317-320.

Physics

6

Ammonia, Atmospheric Composition, Atmospheric Models, Photochemical Reactions, Troposphere, Vertical Distribution, Ammonium Nitrates, Computerized Simulation, Diffusion Coefficient, Infrared Radiometers, Synoptic Measurement, Turbulent Diffusion

Scientific paper

A one-dimensional tropospheric photochemical model is used to simulate measured profiles of NH3 obtained with the Infrared Heterodyne Radiometer. The relative roles of homogeneous loss, heterogeneous loss, and vertical eddy transport are discussed in terms of selecting parameters which best fit the measurements. The best fit was obtained for a vertical eddy diffusion coefficient of 200,000/sq cm per sec or greater (corresponding to a characteristic vertical transport time in excess of about 35 days), and a characteristic heterogeneous loss time in excess of 10 days. The characteristic homogeneous chemical loss time was found to be about 40 days at the surface and decreased to about 180 days at 10 km, and not very sensitive to model chemical perturbations. Increased ground-level concentrations of NH3 to about 10 ppb, compared to background surface concentrations of about 1 ppb, were measured several weeks after application of ammonium nitrate fertilizer. This suggests that the volatilization of ammonium nitrate fertilizer is rapid, and an important source of NH3. Because of the characteristic times for the loss mechanisms, synoptic time-scale phenomena may play an important role in determining the tropospheric distribution of NH3 concentrations.

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