Presentation is loading. Please wait.

Presentation is loading. Please wait.

Nitrogen Deposition over the US Raluca Ellis, Fabien Paulot Daven Henze, Daniel Jacob Harvard University, U. Colorado Boulder AQAST 3 meeting, June 13,

Similar presentations


Presentation on theme: "Nitrogen Deposition over the US Raluca Ellis, Fabien Paulot Daven Henze, Daniel Jacob Harvard University, U. Colorado Boulder AQAST 3 meeting, June 13,"— Presentation transcript:

1 Nitrogen Deposition over the US Raluca Ellis, Fabien Paulot Daven Henze, Daniel Jacob Harvard University, U. Colorado Boulder AQAST 3 meeting, June 13, 2012 Funding: AQAST, HUCE Air Quality Management Partner: Bret Schichtel, NPS

2 Nitrogen in the Nation’s Rain, NADP, 2000 Pathways of Reactive Nitrogen NH 3 NO x

3 CL = 1.5 wet kg N ha -1 a -1 alpine lakes CL = 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 load Specific to certain resource and defined harmful effect

4 Total nitrogen deposition to the US (wet + dry) GEOS-Chem total nitrogen deposition ( annual mean) Nested North American model 0.5 o x o resolution Evaluated using NADP, CASTNetsee Zhang et al., ACP, 2012

5 Total nitrogen deposition to the US (wet + dry) GEOS-Chem total nitrogen deposition ( annual mean) Nested North American model 0.5 o x o resolution Evaluated using NADP, CASTNetsee Zhang et al., ACP, 2012 Parks exceeding critical load nclude Rocky Mountain, Joshua Tree, Great Smoky Mountains Many western parks near critical load

6 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

7 NO x emissions are going down but NH 3 is increasing Will N deposition decrease or increase? Will source attribution change? Can critical load goals be met? Total N emissions 2050 – 2005 RCP 2.6 RCP future emission scenarios Total N emissions 2050 – 2005 RCP 8.5 World emissions


Download ppt "Nitrogen Deposition over the US Raluca Ellis, Fabien Paulot Daven Henze, Daniel Jacob Harvard University, U. Colorado Boulder AQAST 3 meeting, June 13,"

Similar presentations


Ads by Google