Incorporation of Seasonal Nitrogen Dynamics within a Long-Term Acidification Model |
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Authors: | Collins Robert Jenkins Alan |
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Institution: | (1) Centre for Ecology and Hydrology, Wallingford, UK;(2) Centre for Ecology and Hydrology, Wallingford, UK |
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Abstract: | This paper describes an application of the long termdynamic model, MAGIC, on a monthly timestep, enablingincorporation of the seasonal dynamics associated with abroad understanding of the ecosystem N cycle. The modelhas been applied to the Dargall Lane catchment in theGalloway region of Scotland where marked seasonal Ndynamics are apparent. Mean monthly proportions ofrainfall, runoff, deposition fluxes and net retention ofN are utilised to drive the model on a monthly timestep.Calibration of the model has successfully reproduced thepresent day observed seasonal variation in streamNO3 and ANC. Prediction of recovery at the siteunder the second sulphur protocol indicates that,although mean annual ANC increases, mean monthly ANC doesnot rise above zero for all months of the year until2010. |
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Keywords: | ANC freshwater critical loads MAGIC nitrogen recovery seasonality |
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