Overview: 1) National Emissions Inventory 1999 (EPA NEI99) A new anthropogenic emissions inventory over the U.S. 2) Export of reactive nitrogen during the ICARTT summer intensive. GEOS-CHEM Meeting April 4, 2005 A multi-platform analysis of the North American reactive nitrogen budget during the ICARTT summer intensive R. C. Hudman, D. J. Jacob, S. Turquety, ITCT-2K4 science team, INTEX-NA science team
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Overview:
1) National Emissions Inventory 1999 (EPA NEI99) A new anthropogenic emissions inventory over the U.S.
2) Export of reactive nitrogen during the ICARTT summer intensive.
GEOS-CHEM MeetingApril 4, 2005
A multi-platform analysis of the North American reactive nitrogen budget during the ICARTT summer intensive
R. C. Hudman, D. J. Jacob, S. Turquety, ITCT-2K4 science team, INTEX-NA science team
National Emissions Inventory 1999 (NEI99):New GEOS-CHEM anthropogenic emissions over the United States
EPA releases new emission inventories for the US every three years - .25X.25 gridded product for 1999- Monthly, weekday/weekend (keep diurnal cycle as is in current inventory)- New geographical distributions!
National Emissions Inventory 1999 (NEI99):New GEOS-CHEM anthropogenic emissions over the United States
GEOS-CHEM vs. INTEX-NA and ITCT2k4: Comparison along the flight tracks*
PAN:Newunderestimatein the free trop.
HNO3:Previous overestimatecorrected?
Overestimate of CO and NOx in boundary layerAnthro. sourcebias?
NOx: underestimate above 10 km lightning?
* local, strat, BB filtered
NOy export efficiency, f:Regional differences in export efficiency
NARE region has the lowest f . Is this a result of uplift over water after NOy has been removed in MBL?
Is lower export efficiency from southern U.S. a result of stagnation?
Lower export efficiencies seen than Fall studies...~15%
[NOy] - [NOy]bkd[CO] - [CO]bkd
f =
R= anth. emission ratio ofCO/NOx = 6.15 (NEI - all US avg)
[CO]bkd = 75 ppbv, [NOy]bkd=300 ppt
Reg
ions
xR NARE
OffShoreSOUTH
NE and MidWest
PLUMES DEFINEDAS CObkd + 30 ppbv
Convective NOx issue
boundary layer venting
WCB
GEOS-CHEMcaptures theseexport differences
Proposed Future Work
1) A multi-platform analysis of the North American reactive nitrogen budget during the ICARTT summer intensive.
2) Impact of North American pollution on global ozone and transatlantic transport
- The complete ICARTT data set is an outstanding data set to provide a synthesis of differences in regional distribution of NOy export and partitioning
- What are the implications of this export of NOy and ozone precursors to global ozone and transatlantic transport?