Abstract
Abstract The variations of CO2, CH4, COS, and NMHC concentrations, and of 222Rn activity were studied simultaneously in the boundary layer in a littoral site in Brittany, France. Various meteorological conditions occurred during the experiment allowing determination of trace gas concentrations characteristic of air masses having either dominant continental or oceanic influence. The relative NMHC concentration of the air reflects the origin of the air masses. Oceanic air is characterized by high proportions of alkenes, whereas the alkanes concentration is higher in continental air masses. In 1986 alternate sea- and land-breeze conditions allowed measurement of the evolution of the composition of an oceanic air mass under continental influence. By using the variabilities of 222Rn activities measured during the experiment, as well as the estimation of its mean flux over continents, we deduced the mean regional fluxes of CO2, CH4 and COS to be 5.8, 0.07 and −36 × 10−6 m mol m−2 h−1, respectively.
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