S. Galmarini et al., FLUXES OF CHEMICALLY REACTIVE SPECIES INFERRED FROM MEAN CONCENTRATION MEASUREMENTS, Atmospheric environment, 31(15), 1997, pp. 2371-2374
A method is presented for the calculation of the fluxes of chemically
reactive species on the basis of routine measurements of meteorologica
l variables and chemical species. The method takes explicity into acco
unt the influence of chemical reactions on the fluxes of the species.
As a demonstration of the applicability of the method, micro-meteorolo
gical and atmospheric chemistry measurements (O-3 NO and NO2) collecte
d at Zegveld (NL) in 1994 are used to calculate the fluxes of chemical
ly reactive species. In the absence of direct flux measurements, the c
alculated fluxes are compared to the fluxes obtained without taking th
e chemical effect into account. At 2 m from the surface the effect of
chemical transformation is less than 10%, whereas at 10 m it can be as
much as 40%. An explanation of this effect is given in terms of the r
atio of the gradients of the species and the ratio of the time scale o
f turbulence to that of chemistry. The method presented is applicable
to any surface-layer stability or chemical system. (C) 1997 Elsevier S
cience Ltd.