Nitrogen Deposition over the US
Raluca Ellis, Fabien PaulotDaven Henze, Daniel Jacob
Harvard University, U. Colorado Boulder
AQAST 3 meeting, June 13, 2012
Funding: AQAST, HUCEAir Quality Management Partner: Bret Schichtel, NPS
CL = 1.5 wet kg N ha-1 a-1 alpine lakes CL = 3 - 8 kg N ha-1 a-1 forest/trees
CL = 3.0 kg N ha-1 a-1 lichens Pardo et al., Ecol Appl, 2011
Quantify relationship between deposition and ecosystem response = critical loadSpecific to certain resource and defined harmful effect
Total nitrogen deposition to the US (wet + dry)
GEOS-Chem total nitrogen deposition (2006-2008 annual mean)Nested North American model 0.5o x 0.667o resolution
Evaluated using NADP, CASTNet see Zhang et al., ACP, 2012
Total nitrogen deposition to the US (wet + dry)
GEOS-Chem total nitrogen deposition (2006-2008 annual mean)Nested North American model 0.5o x 0.667o resolution
Evaluated using NADP, CASTNet see Zhang et al., ACP, 2012
Parks exceeding critical load nclude Rocky Mountain, Joshua Tree, Great Smoky MountainsMany western parks near critical load
Zhang et al., ACP, 2012
Source Attribution of Reactive Nitrogen
Generally less than 10% but up to 30% near borders
Higher than average in areas affected by lightning and wildfires
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