Yazar "Mills, G." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Country-specific correlations across Europe between modelled atmospheric cadmium and lead deposition and concentrations in mosses
    (Elsevier Sci Ltd, 2012) Harmens, H.; Ilyin, I.; Mills, G.; Aboal, J. R.; Alber, R.; Blum, O.; Coskun, M.
    Previous analyses at the European scale have shown that cadmium and lead concentrations in mosses are primarily determined by the total deposition of these metals. Further analyses in the current study show that Spearman rank correlations between the concentration in mosses and the deposition modelled by the European Monitoring and Evaluation Programme (EMEP) are country and metal-specific. Significant positive correlations were found for about two thirds or more of the participating countries in 1990, 1995, 2000 and 2005 (except for Cd in 1990). Correlations were often not significant and sometimes negative in countries where mosses were only sampled in a relatively small number of EMEP grids. Correlations frequently improved when only data for EMEP grids with at least three moss sampling sites per grid were included. It was concluded that spatial patterns and temporal trends agree reasonably well between lead and cadmium concentrations in mosses and modelled atmospheric deposition. (C) 2012 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    Nitrogen concentrations in mosses indicate the spatial distribution of atmospheric nitrogen deposition in Europe
    (Elsevier Sci Ltd, 2011) Harmens, H.; Norris, D. A.; Cooper, D. M.; Mills, G.; Steinnes, E.; Kubin, E.; Thoeni, L.
    In 2005/6, nearly 3000 moss samples from (semi-)natural location across 16 European countries were collected for nitrogen analysis. The lowest total nitrogen concentrations in mosses (<0.8%) were observed in northern Finland and northern UK. The highest concentrations (>= 1.6%) were found in parts of Belgium, France, Germany, Slovakia, Slovenia and Bulgaria. The asymptotic relationship between the nitrogen concentrations in mosses and EMEP modelled nitrogen deposition (averaged per 50 km x 50 km grid) across Europe showed less scatter when there were at least five moss sampling sites per grid. Factors potentially contributing to the scatter are discussed. In Switzerland, a strong (r(2) = 0.91) linear relationship was found between the total nitrogen concentration in mosses and measured site-specific bulk nitrogen deposition rates. The total nitrogen concentrations in mosses complement deposition measurements, helping to identify areas in Europe at risk from high nitrogen deposition at a high spatial resolution. (C) 2011 Elsevier Ltd. All rights reserved.