Abstract
Abstract As part of the GRIP-GISP programme, sampling of superficial polar ice was carried out in the neve of the Summit station situated in the centre of Greenland, during summer 1991. Twenty-four samples were taken from the first three meters of the ice layer. This is a record of the organic matter concentrations of the air during last five years. This first study concerns the polycyclic aromatic hydrocarbons (PAH) present in the insoluble phase of the ice. It shows that, in the atmosphere, PAH adsorbed on fine particles travel over long distances from industrial regions, especially from Russia and East Europe or, may be, from low latitudes regions to polar regions. Then they are deposited during snow falls and are archived in the ice. All the PAH emitted by fossil fuel combustion are present in the insoluble phase of the ice. However PAH produced by biomass combustion are also present in the ice in essar abundance. On average the total amount of PAH is of the order of a few hundred picogramms per kg of...
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