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Modelled mapped ratio of concentrations of PCB153 in the winter (DJF) atmosphere (a and b, above) and surface compartments (c and d, below), with and without climate change (A1B scenario of the IPCC AR4) for the middle (a and c, 2050s/1990s) and end (b and d, 2090s/1990s) of the century. Values exceeding 1 indicate enhancement by climate change
