Ep. Vanleeuwen et al., MAPPING WET DEPOSITION OF ACIDIFYING COMPONENTS AND BASE CATIONS OVEREUROPE USING MEASUREMENTS, Atmospheric environment, 30(14), 1996, pp. 2495-2511
Precipitation concentrations of various acidifying components and base
cations in 1989 on a European scale were obtained from national organ
isations responsible for wet deposition monitoring in their countries
and from the EMEP database. In total, results were gathered from 824 m
onitoring locations scattered over Europe. Annual mean concentrations
were corrected for the contribution of dry deposition onto the funnels
of bulk samplers. Spatial analysis based on regionalised variable the
ory revealed autocorrelation in all ion concentrations and reasonable
bounded models were fitted to the experimental variograms. Maps of con
centrations of acidifying components and base cations were compiled us
ing the block-kriging interpolation technique. To obtain fluxes, conce
ntrations were multiplied by long-term mean precipitation amounts from
the EPA database. Wet deposition fluxes over Europe were mapped on a
50 x 50 km scale for nonmarine sulphate, nitrate, ammonium, hydrogen,
chloride, sodium, magnesium, potassium and calcium. An extensive uncer
tainty analysis was performed to assess the quality of the maps. Copyr
ight (C) 1996 Elsevier Science Ltd.