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Vertical distribution of Arctic haze in summer, winter, and the whole year Sulfur air concentrations and relative source-contribution (%) for different heights above the ground are shown The concentrations are averages over the Arctic area north of 70°NVertical distribution of Arctic haze in summer, winter, and the whole year Sulfur air concentrations and relative source-contribution (%) for different heights above the ground are shown The [..] |
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Time trends of mean methylmercury concentrationsTime trends of mean methylmercury concentrations |
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SMART model results for selected soil and lake output variables at Christmas lakes for the past 90 years and for three future scenarios assuming a 0%, 70% and 95% reduction of the present sulfur deposition levelsSMART model results for selected soil and lake output variables at Christmas lakes for the past 90 years and for three future scenarios assuming a 0%, 70% and 95% reduction of the present sulfur [..] |
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Model calculations of total (wet and dry) deposition estimates of sulfur for 1988Model calculations of total (wet and dry) deposition estimates of sulfur for 1988 |
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Locations of background monitoring stations for air and precipitation chemistryLocations of background monitoring stations for air and precipitation chemistry, and arctic haze and the Russian precipitation chemistry stations |
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Arctic air masses and atmospheric transport routesThe mean position of the Arctic air mass in winter (January) and summer (July), superimposed on the (summer value % (orange) - winter value % (blue)) frequency of major south-to-north transport routes [..] |
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Cloud cover and precipitation in the Canadian High ArcticSeasonal variation in a) cloud cover and precipitation occurrence and b) precipitation amount in the Canadian High Arctic, 1951-1980 norms |
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Atmosphere-surface exchangeSchematic diagram of processes of atmosphere-surface exchange |
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Precipitation rate measurements from Alert from January through April 1992 showing periods of no snow, periods of no snow measured due to wind events, and the relatively large quantities of precipitation on days duringPrecipitation rate measurements from Alert from January through April 1992 showing periods of no snow, periods of no snow measured due to wind events, and the relatively large quantities of [..] |
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Concentrations of sum-HCH in Arctic airConcentrations of sum-HCH in Arctic air |
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Source regions for HCH, chlordane, toxaphene, and PCBs in Arctic air based on 5-day back-trajectories for elevated air concentrations at Tagish, Alert, and Ny-ÅlesundSource regions for HCH, chlordane, toxaphene, and PCBs in Arctic air based on 5-day back-trajectories for elevated air concentrations at Tagish, Alert, and Ny-Ålesund |
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Concentrations of sum-PCB in Arctic air (sum of CBs 28, 31, 52, 101, 105, 118, 138, 153, 156, 180)Concentrations of sum-PCB in Arctic air (sum of CBs 28, 31, 52, 101, 105, 118, 138, 153, 156, 180) |
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Flux of HCH and sum-PCB (sum of 10 congeners) in precipitation at Heimaey Island, IcelandFlux of HCH and sum-PCB (sum of 10 congeners) in precipitation at Heimaey Island, Iceland |
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Temporal trends in OC levels (ng/g lw) in reindeer from Abisko, Sweden Levels are usually based on a pool of 10 samplesTemporal trends in OC levels (ng/g lw) in reindeer from Abisko, Sweden Levels are usually based on a pool of 10 samples |
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Deposition of PCBs, as mono/di/trichloro- and tetra-nonachlorobiphenyls) in snow cores from the Agassiz Ice Cap (northern Ellesmere Island, Canada) Combined light and dark shaded sections of each bar indicate sum-PCB fluxDeposition of PCBs, as mono/di/trichloro- and tetra-nonachlorobiphenyls) in snow cores from the Agassiz Ice Cap (northern Ellesmere Island, Canada) Combined light and dark shaded sections of each bar [..] |
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