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    Topography: measurement site is located on the shore of Barents Sea at the input to the Teriberka bay. In the angle rang 280-6 deg. from N. Barents Sea, 6-80 deg. - Teriberka bay, 80-280 - ground surface, cliff with slight vegetation. Sampling site is the highest point in the nearest vicinity. The nearest settlement is located south the measurement site at 1 km distance. Vegetation: undergrowth tundra. Climate: sub-arctic zone with the influence of Atlantic air masses with net effect of temperate maritime climate, permafrost zone. Mean temperature: annual 0.6oC, max in July 11.2 oC, min in February 11.6 oC. Mean wind speed: annual 7.1m/s, min in July 5.1m/s, max in December and January 8.4m/s. Mean relative humidity: annual 79%, min in April-June 75%, max in August-October 81%. Dominant wind direction: in winter S (30%) and SW (30%), in summer NW (23%). Snow caver 204 days/year from second half of October to second half of May. Annual mean precipitation is 472mm.

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    Located on the west coast of Ireland, the Atmospheric Research Station at Mace Head, Carna, County Galway is unique in Europe, offering westerly exposure to the North Atlantic ocean (clean sector, 180 degrees through west to 300 degrees) and the opportunity to study atmospheric composition under Northern Hemispheric background conditions as well as European continental emissions when the winds favour transport from that region. The meteorological records show that on average, over 60% of the air masses arrive at the station via the clean sector. These air masses are ideal for carrying out background aerosol and trace gas measurements. Significant pollution events also occur at the site when European continental air masses, generally originating from an easterly direction, reach Mace Head. The Mace Head research station, is uniquely positioned for resolving these different air masses and for comparative studies of their constituents and characteristics.

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    The Puy de Dôme station is located a few tens of km from local sources of pollution and the air is representative of the synoptic-scale atmospheric composition of the regional (polluted) atmospheric background. The site is equipped with in-situ meteorological instrumentation as well as continuous measurements of gaseous species(CO2, O3, CO, NOx, NOy, and SO2), particulate species (optical properties, size distribution, chemical composition) and radionucleides. Due to the frequent presence of clouds, the site is also equipped for retrieval of cloud microphysical and chemical parameters.

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    Zugspitze is the highest mountain of the German Alps (2964 m a.s.l.). It is located in southern Germany, about 90 km southwest of Munich, at the Austrian border. Monitoring of air pollution up to 1999 was carried out from an aluminium sheltered cabin on the view point terrace (47o 25' N, 10o 59' E; 2962 m a.s.l.). Trace gas measurements were re-located in 2000 to the new Environmental Research Station "Schneefernerhaus" at 2656 m a.s.l. on the southern slope of Zugspitze. Together with the Meteorological Observatory Hohenpeissenberg (40 km north), this platform establishes the Global Station Zugspitze/Hohenpeissenberg. The monitoring program is operated jointly by the Federal Environmental Agency (Umweltbundesamt, UBA) and the German Meteorological Service (Deutscher Wetterdienst, DWD).

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    Italian North Appenine mountain peak with completly free horizon. No local sources of contamination. No access by road. Operational baseline station since June 1978. Prevaling wind directions: SSW and NE.

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    Highest point on the Greenland Ice Sheet

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