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NHx and NOy wet/dry deposition

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shirleyxyliu@...
NHx and NOy wet/dry deposition

Dear all,

Has anyone dealt with NHx or NOy deposition from CAM?

1. I'm asking how CAM outputs wet and dry deposition for NHx and NOy(WD_NHX, WD_NOY, DF_NHX, DF_NOY). Is it the sum of all the individual species, (say NHx is the sum of NH3 and NH4, NOy is the sum of HNO3 + NOx + HONO + organic nitrate molecules + aerosol nitrate), or CAM calculates NHX and NOy independently from all those sub-species?

I suppose the deposition of NOy is calculated as the sum of all the oxidized N. But in my simulated results, the dry deposition for NOy is reasonable but the dry deposition for HNO3 is even higher than NOy! How could deposition of HNO3 is even higher than NOy since NOy = HNO3 + NOx + HONO + organic nitrate molecules + aerosol nitrate?

BTW, my configuration is coupled CAM4 and CLM45 with MOZART chemistry.

2. Wet deposition for NH4 is zero in my simulation results. Why is that? 

3. Another question is what is the name of history fields of N related species (say NOy, NHx, NH4 etc) if I use NEU wet deposition scheme? Is it the same as WD_* or DTWT_* or something else in CAM4/CESM122? 

 

4. In term of N deposition, which of the two wet deposition scheme (MOZART and NEU) is more realistic?

 

Best,

Shirley

 

 

 

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