caa a22 4500 467903603 CHVBK 20180406152826.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10661-005-9029-0 doi (NATIONALLICENCE)springer-10.1007/s10661-005-9029-0 Modeling the Effect of Liming on Calcium Concentration in Swedish Lakes [Elektronische Daten] [Elisabet Göransson, Ewa Bringmark, Lars Rapp, Anders Wilander] To abate the severe acidification of Swedish lakes are about 7% directly limed (AL-lakes). These are important to include when assessing acidification. Consequently, we need to estimate their chemical status as if they were not lime-affected. We hypothesize that there is a spatial dependence for calcium (Ca) and magnesium (Mg) concentrations. Spatial variation is determined using variograms. We study lakes within two 150 ∗ 150 km quadrates (EMEP150-grid) in the middle and southern parts of Sweden. We model Ca in AL-lakes using the Ca and Mg concentrations in nearby, unaffected lakes (UL-lakes). The mean Ca/Mg for the three or seven closest UL-lakes is used. We assume that Ca/Mg is constant for UL-lakes and that Mg unaltered by liming. For UL-lakes, Ca and Mg are spatially dependent. For AL-lakes, there is a spatial dependence for Mg, but, as anticipated, not for Ca. The modeled Ca for UL-lakes show a good correspondence with measured Ca; r 2 > 0.6; slopes close to 1 and intercepts almost 0. Using three or seven nearby lakes when modeling Ca give similar results. Modeled Ca was higher than measured Ca for 36% (three closest lakes) and 38% (seven closest) of the modeled AL-lakes in the middle part of Sweden. The corresponding results for the southern part were 10% and 9%, respectively. This model is an acceptable estimator of Ca in limed lakes and for estimating critical loads and acidification status on an EMEP-scale. Springer Science+Business Media, Inc., 2006 acidification nationallicence Ca nationallicence geostatistical analysis nationallicence liming nationallicence Mg nationallicence spatial dependence nationallicence Sweden nationallicence variogram nationallicence water chemistry nationallicence Göransson Elisabet Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut Bringmark Ewa Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut Rapp Lars Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut Wilander Anders Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut Environmental Monitoring and Assessment Kluwer Academic Publishers 119/1-3(2006-08-01), 331-348 0167-6369 119:1-3<331 2006 119 10661 https://doi.org/10.1007/s10661-005-9029-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-005-9029-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Göransson Elisabet Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut NATIONALLICENCE 700 1- Bringmark Ewa Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut NATIONALLICENCE 700 1- Rapp Lars Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut NATIONALLICENCE 700 1- Wilander Anders Department of Environmental Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 119/1-3(2006-08-01), 331-348 0167-6369 119:1-3<331 2006 119 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer