Implications of natural sources for the latitudinal gradients of NO/y/ in the unpolluted troposphere

Details Implications of natural sources for the latitudinal gradients of NO/y/ in the unpolluted troposphere Implications of natural sources for the latitudinal gradients of NO/y/ in the unpolluted troposphere

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..591h&link_type=abstract

Geophysical Research Letters, vol. 8, June 1981, p. 591-594.

Physics

18

Atmospheric Chemistry, Lightning, Nitrogen Oxides, Photochemical Reactions, Troposphere, Gas Discharges, Northern Hemisphere, Reaction Kinetics, Southern Hemisphere

Scientific paper

The latitudinal distributions of tropospheric odd nitrogen (NO/y/) due to lightning discharges and stratospheric injection are studied by estimating latitude dependences of the sources and the rainout sink from data obtained in August-September, 1977, and May-June, 1978, during project GAMETAG. A one-dimensional (latitude dependent) model is developed for the annually, zonally, and vertically averaged concentration of trace species, NO(y) being treated as a single species, which decouples the NO(y) calculation from the rest of the model since NO(y) has no chemical sources or sinks in the troposphere. The equation governing the NO(y) distribution is solved using finite differences with 33 uniformly spaced grid points in the micron range of -1 to 1. The distribution due to the stratospheric source has a minimum in the tropics, and there are broad maxima centered in the 25-30 degree region in both hemispheres. The calculated NO(y) due to lightning has a maximum near 15 degrees S, and it decreases to nearly a fourth of the maximum value near the poles. The drop off from the maximum is sharper in the Southern Hemisphere in comparison with the Northern Hemisphere.

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