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07.04.2009 Lok Lamsal, Randall Martin, Aaron van Donkelaar Folkert Boersma, Ruud Dirksen (KNMI)...
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Transcript of 07.04.2009 Lok Lamsal, Randall Martin, Aaron van Donkelaar Folkert Boersma, Ruud Dirksen (KNMI)...
07.04.2009
Lok Lamsal, Randall Martin, Aaron van Donkelaar Folkert Boersma, Ruud Dirksen (KNMI)
Edward Celarier, Eric Bucsela, James Gleason (NASA)
E.S. Edgerton, B. Hertsell (ARA Inc.)Y. Wang, C. Luo (Georgia Institute of
Technology)
Seasonal Variation of Nitrogen Oxides at Northern
Midlatitudes as Inferred from Ground- and
Satellite-based Observations
Lok Lamsal, Randall Martin,
Aaron van Donkelaar
Folkert Boersma, Ruud Dirksen (KNMI)
Edward Celarier, Eric Bucsela, James
Gleason (NASA, GSFC)
28.07.2009
MOCA-09, Montreal, July 19-29
Substantial Seasonal Difference in Tropospheric NO2 Columns: Example from
GOME
van Noije, ACP, 2006
Retrievals from University of Bremen, Dalhousie/SAO, BIRA/KNMI
Difference in winter up to a factor of 2
Monthly tropospheric NO2 columns over Eastern U.S. from three independent retrievals
(71-90W, 35-43N)
Uni Bremen
BIRA/KNMI
Dalhousie/SAO
Large Seasonal Difference in Tropospheric NO2 Columns Among OMI Retrievals
How does the actual seasonal variation look like? Which one is closer to reality?
What causes the observed difference?
What drives the seasonal variation?
Research Questions:
Monthly tropospheric NO2 columns over the United States from OMI
Standard Product (SP)
DOMINO Product (DP)
DP_GCDOMINO product with stripes correction and GEOS-Chem NO2 profilesModified DP (DP_GC)
Comparison of OMI NO2 with Surface Measurements
OFGG
GO Ω
1)Ω(λλΩ
λSS
O
O
Ω
Ωλ ,
(B) Derive surface-level NO2 from OMI (Lamsal et al., 2008, JGR)
(A) In-situ surface NO2 measurements from the SEARCH and EPA/AQS networks (Rural sites only)
×
SEARCH (3)
EPA/AQS (8)
Comparison of OMI-derived Emission with Bottom-up Inventory
(B) Derive top-down emissions from OMI (Martin et al., 2003, JGR)
mod sat bg
sat modi,j i,j i,j1 1 mod bgi,j i,j
modi,j i,j
m,n i+m,j+nm=-1n=-1
= × ×E Ω Ω
E EΩ Ωk E
(A) Updated bottom-up emission inventories
VISTAS 2002 and CAC 2005 (North America)
EMEP 2005 (Europe)
Street 2006 (East Asia)
Summary of Comparison - Validation of OMI Tropospheric NO2
SEARCH domain North America
SEARCH, Southeastern U.S. AQS/EPA, U.S.
What Causes the Observed Difference?
Algorithm
component
Standard product (SP) DOMINO (DP) DP_GC
Slant column DOAS fit (405-465nm) Same as SP
Stripe correction? Yes No Yes
Strat-trop separation Analysis of
observation
TM4
assimilation
Trop NO2 profile GEOS-Chem annual Daily TM4 Daily
GEOS-Chem
Scattering weights TOMRAD DAK
Surface reflectivity GOME climatology GOME+TOMS
Surface pressure Climatological ECMWF
Cloud
pressure/fraction
O2-O2 cloud algorithm Same as SP
AMF
Difference Between DP and SP: Contribution of Stratosphere-troposphere Separation and AMF
Strat-trop separation Air mass factor Combined
What Drives the Seasonal Variation in Tropospheric NO2?
τGC
τOMI
τGC
Seasonal variation in (a) NOx
emissions
(b) NOx lifetime
Daily Average
OMI time
OMI time
Gas phase (NO2 + OH)
Aerosol uptake of NO2, NO3, and N2O5
Indirect validation of tropospheric nitrogen dioxide retrieved from the OMI satellite instrument: Insight into the seasonal variation of nitrogen oxides at northern midlatitudes, 2009, L. N. Lamsal, R. V. Martin, A. van Donkelaar, E. A. Celarier, F. K. Boersma, R. Dirksen, C. Luo, and Y. Wang, J. Geophys. Res., Submitted