The exchange of nitric oxide, nitrogen dioxide and ozone between pasture and the atmosphere

Fluxes of NO, NO 2 and O 3 were determined over a drained marshland pasture in south-east England by using flux-gradient techniques. Nitric oxide was found to be emitted at rates of up to 40 ng m −2 s −1, the rate of emission being related to the magnitude of the eddy diffusivity. Nitrogen dioxide d...

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Bibliographic Details
Published in:Environmental pollution (1987) 1992, Vol.75 (1), p.53-59
Main Authors: Hargreaves, K.J., Fowler, D., Storeton-West, R.L., Duyzer, J.H.
Format: Article
Language:English
Subjects:
air pollution
atmosphere
canopy
deposition
dry deposition
flux
gas exchange
nitric oxide
nitrogen dioxide
ozone
pasture plants
pastures
south east england
stomata
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Summary:Fluxes of NO, NO 2 and O 3 were determined over a drained marshland pasture in south-east England by using flux-gradient techniques. Nitric oxide was found to be emitted at rates of up to 40 ng m −2 s −1, the rate of emission being related to the magnitude of the eddy diffusivity. Nitrogen dioxide deposited at rates of up to 90 ng m −2 s −1 under the control of stomatal resistance, a clear diurnal cycle being observed. Minimum canopy resistance was of the order of 80 s m −1. Ozone deposition was also controlled by stomatal resistance, the minimum canopy resistance being around 100 s m −1 and fluxes reaching a maximum of 220 ng m −2 s −1. Corrections made to NO and NO 2 fluxes to compensate for chemical reactions showed flux divergences of the order of 30% for NO and NO 2, but these were not statistically significantly different from the measured fluxes. The pasture was found to be a net sink for nitrogen in the form of NO x.
ISSN:0269-7491
1873-6424
DOI:10.1016/0269-7491(92)90056-G