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An improved wet deposition map of the United Kingdom incorporating the seeder-feeder effect over mountainous terrain.

Dore, A J; Choularton, T W; Fowler, D.. 1992 An improved wet deposition map of the United Kingdom incorporating the seeder-feeder effect over mountainous terrain. Atmospheric Environment, 26A (8). 1375-1381. 10.1016/0960-1686(92)90122-2

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Abstract/Summary

Data of the mean annual rainfall at 4000 sites across the United Kingdom during the period 1986–1988 have been used. These were combined with measurements of the concentrations of principal ions in rainfall at 59 rural lowland sites. The data have been modified to account for the higher concentrations of ions dissolved in rain water measured in mountainous areas. This occurs due to the scavenging of polluted hill caps clouds by less-polluted raindrops. It was assumd that scavenged cloudwater concentrations were double those of the local rainfall. The results show that the annual deposition by rainfall of pollutant ions over high ground is much higher than had previously been thought. Relative to the original scheme, which assumed ion concentrations were constant with height, the new scheme calculated increases in deposition of up to 76%. Rainfall was found to be more polluted near the east coast of Britain. However, the highest annual pollutant deposition by rainfall occurred in the mountainous regions near the west coast, such as the Lake District and Snowdonia, due to the high rainfall in these areas.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/0960-1686(92)90122-2
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: _ Pre-2000 sections
ISSN: 1352-2310
Additional Keywords: Orographic rainfall, seeder—feeder effect, pollutant deposition, cap cloud
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 13 May 2009 11:54
URI: http://nora.nerc.ac.uk/id/eprint/6588

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