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| Titel |
Influence of summer and winter climate variability on nitrogen wet deposition in Norway |
| VerfasserIn |
L. R. Hole, H. A. Wit, W. Aas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 12, no. 2 ; Nr. 12, no. 2 (2008-03-05), S.405-414 |
| Datensatznummer |
250010564
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| Publikation (Nr.) |
 copernicus.org/hess-12-405-2008.pdf |
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| Zusammenfassung |
| Dominating wind patterns around Norway may change due to climate warming.
This could affect transport of polluted air masses and precipitation. Here,
we study relations between reactive nitrogen wet deposition and air mass
transport during summer and winter expressed in the form of climate indices,
at seven sites in Southern Norway for the period 1980–2005. Atmospheric
nitrate concentrations decreased with 0 to 50% in the period,
particularly at sites with little precipitation, and mostly during
1990–2005. For comparison, reported reductions in emissions of oxidised
nitrogen in Europe in 1989–2003 were 23%. Climate indices explained up to
36% of the variation in winter nitrate deposition at the western and
northern sites – and also explained 60% of the variation in winter
precipitation (R=0.77). This suggests that the variation in nitrate wet
deposition is closely related to variation in precipitation, and that the
climate indices seem to also partly control the variation in atmospheric
nitrate concentrations (R=−0.45 at coastal sites). At the coastal sites,
local air temperature was highly correlated (R=0.84) with winter nitrate
deposition, suggesting that warm, humid winter weather results in increased
wet nitrate deposition. For ammonia the pattern was similar, but this
compound is more influenced by local sources. Expected severe increase in
precipitation in western and northern regions as a consequence of climate
change suggest that nitrogen deposition in these areas will increase under
global warming if emissions are held constant. |
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