Assessing the neutralisation, wet deposition and source contributions of the precipitation chemistry over Europe during 2000–2017

Environmental Sciences Europe

Table 2 Varimax rotated factor loadings, total variance and possible sources over Europe

Europe	F1	F2	F3	F4	F5
Na⁺	0.26	0.87	0.27	− 0.07	0.12
K⁺	0.14	0.14	0.09	0.02	0.98
Ca²⁺	0.70	0.22	0.52	0.20	0.04
Mg²⁺	0.29	0.39	0.82	0.11	0.13
SO₄²⁻	0.76	0.51	0.10	0.17	0.07
Cl⁻	0.27	0.89	0.20	0.07	0.11
NO₃⁻	0.09	0.01	0.07	0.99	0.02
NH₄⁺	0.89	0.19	0.17	0.05	0.15
% Total variance	26.47	25.71	13.70	12.92	12.84
Possible source	Anthropogenic and mixed	Marine	Terrestrial	Traffic	Biomass burning and fertilisation

Principal Component Analysis (PCA) has been applied to precipitation chemistry data, in order to identify possible sources of pollutants and to reveal the important relationships amongst variables
The italic values indicate the significant loadings in case of each factor