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Title:
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Dry deposition of acidifying components on forest
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Author(s):
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Published by:
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Publication date:
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ECN
Biomass, Coal and Environmental Research
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15-10-2007
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ECN report number:
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Document type:
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ECN-E--07-077
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ECN publication
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Number of pages:
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Full text:
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39
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Download PDF
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Abstract:
In this study we compare the results of a high resolution dry deposition model for Germany using two different land use data sets. The default data set is a combination of the Corine 2000 land use dataset plus inventory based average tree heights per tree class and Bundesland. The alternative is a combination of GSE-FM derived tree species and tree heights with the Corine land use map. The tree height is an important factor in deposition modelling for forested areas as this determines to a large extent the surface resistance to uptake of the pollutants, as rougher surfaces induce higher turbulence and thus cause higher uptake rates.
The use of the high resolution GSE-FM satellite based product allows for a more detailed calculation of the dry deposition rates of acidifying components over Germany. The GSE-FM derived tree height estimates appear more realistic at the 1 by 1 km pixel level, with lower tree heights at forest edges, higher tree coverage in non-forested pixels and areas with lower (clearings?) or higher tree heights within the larger forested regions.
The average dry deposition loads over the study area (German Bundesland of Sachsen-Anhalt) go down by about 7%. The reductions are largest for coniferous areas, where the average dry deposition goes down by 16%. Reductions can be much larger for individual 1 by 1 km pixels (up to a factor of two or more), especially on the edges of forested regions. Only a small amount of pixels show higher total dry deposition rates.
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