OMI NO 2 observations of boreal forest fires Nicolas Bousserez, Randall V. Martin, Lok Lamsal, and the ARCTAS team Dalhousie University Halifax, Nova Scotia.

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Presentation transcript:

OMI NO 2 observations of boreal forest fires Nicolas Bousserez, Randall V. Martin, Lok Lamsal, and the ARCTAS team Dalhousie University Halifax, Nova Scotia

ARCTAS experiment Spring/Summer 2008 Summer phase (June, 18 - July, 13) Boreal forest fires over center Canada DC-8 measurements:  NO x concentrations  Aerosols optical properties

Boreal fires emissions over ‘Alberta’ domain OMI (DOMINO KNMI) NO 2 tropospheric columns OMI (DOMINO KNMI) NO 2 tropospheric columns MODIS Aerosol Optical Depth (AOD) MODIS fire pixels ARCTAS summer phase averaged NO 2 and AOD tropospheric columns

DC-8 NO 2 tropospheric columns & AOD Summer Phase (18/06 to 13/07) Tropospheric AOD NO 2 Tropospheric Columns

GEOS-Chem ARCTAS NRT Simulations GEOS-Chem v Modifications:  David Streets 2006 emissions over SE Asia & China  FLAMBE daily biomass burning emissions GEOS-5 Metfields Horizontal Grid: 2º lat x 2.5º lon Vertical Grid: Reduced 47 layers

NO 2 vs Aerosol Extinction in biomass burning plumes Bias in GC GC DC-8 NO 2 (pptV) Extinction coefficient (550nm) (Mm-1) - DC-8 criteria : HCN > 500 pptV NO x /NO y > 40% -GC criteria: CO bb > 90% Total CO (sensitivity runs)

Impact of aerosols and GC NO 2 profiles on NO 2 retrievals? AMF with explicit aerosols and clouds correction (LIDORT model) GEOS-Chem provides NO 2 profiles (shape factor) and aerosol optical properties (scattering weights calculation) Ω v = Ω s / AMF Shape factorScattering weights Ω s = Slant Column Ω v = Vertical Column AMF = Air Mass Factor

AMF sensitivity to aerosols & shape factor AMF Aerosol Correction Factor ~ % AMF Shape Factor Correction Factor ~ - 35 % Shape factor impact dominates AMF/AMF w/o aerosols AMF/AMF w/o bb emissions SSA Mostly Scattering Aerosols DC-8 GC Single Scattering Albedo(SSA)

Significant improvement of the NO 2 /AOD relationship using GC shape factors DC-8 GC KNMI (DOMINO) KNMI_gc (w/ GC profiles) Correction over boreal fires: NO 2 KNMI_GC ~ 2*NO 2 KNMI BB criteria: data points close to MODIS hot spot pixels (r < 10 km) NO 2 AOD (MODIS)

OMI NO 2 / GC std NO 2 AMF corrected / AMF standard Linear relationship between AMF correction factor and OMI NO 2 /GC std NO 2 ratio? Real-time correction to measured NO 2 columns over boreal fires areas In practice, exclude data when AMF corrected /AMF standard < 0.2 Proposed correction for OMI tropospheric NO2 columns over boreal fires OMI NO 2 - GC std NO 2 > 0.5 x GC std NO 2 r = y = x nb pts = 11

Thank you