1 Operational O3M-SAF trace-gas column products: GOME-2 tropospheric NO 2, Ozone, and total SO 2 AT2...
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Transcript of 1 Operational O3M-SAF trace-gas column products: GOME-2 tropospheric NO 2, Ozone, and total SO 2 AT2...
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Operational O3M-SAF trace-gas column products:GOME-2 tropospheric NO2, Ozone, and total SO2
AT2 Seventh WorkshopHelsinki, Sep. 30 - Oct. 1, 2008
P. Valks, N. Hao, M. Rix, D. Loyola, M. Van Roozendael, G.Pinardi, J.-C. Lambert, N. Theys, W. Zimmer and S. Emmadi
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Outline
GOME-2 tropospheric NO2 column product
algorithm descriptionrecent results for China and initial validation
GOME-2 tropospheric ozone columnalgorithm descriptionexample of tropical tropospheric ozone from biomass burnings
GOME-2 total SO2 column product
algorithm description
examples of volcanic SO2 from recent eruptions
Conclusions
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GOME-2 tropospheric NO2 column product
Pre-operational status
Operational status planned for Nov. 2008
Tropospheric NO2 column algorithm
NO2 slant column density with DOAS method
fitting window: 425-450 nm
Estimation of stratospheric NO2 component using spatial filtering
Tropospheric AMF based on MOZART-2 NO2 climatology (Univ. Bremen)
Calculation of tropospheric NO2 column using cloud correction
GOME-2 cloud parameters
OCRA cloud fraction
ROCINN cloud-top height and albedo
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GOME-2 tropospheric NO2 over Beijing
50% private vehicles restricted
vehicles restricted, control of industrial pollution
Jun. Jun. Jun. Jun. Jun. July July July July Aug. Aug. Aug. Aug. Aug. Sep. Sep. 01 08 15 22 29 06 13 20 27 03 10 17 24 31 07 14
* Jun.1-Sep.20 2007□ Jun.1-Sep.20 2008
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Initial validation with ground-based measurements
MAXDOAS at Obs. de Haute Provence (43.9°N, 5.7°E)
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GOME-2 Tropical Tropospheric Ozone algorithm
Convective-cloud-differential (CCD)
method
above cloud and clear-sky ozone column measurements
Tropical tropospheric ozone columns (TTOC) below 200 hPa
GOME-2 data required:
Total ozone columns
Effective cloud fractions and cloud-top pressures (OCRA and ROCINN)
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GOME-2 tropical tropospheric ozone column
Tropospheric Ozone
Tropospheric NO2
September, 2007
ATSR hot spots
Southern hemisphere biomass burnings
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GOME-2 SO2 column product
Pre-operational status planned for Nov. 2008
SO2 slant column algorithm
SO2 slant column density with DOAS method
fitting window: 315-326 nm
Background correction
interference of SO2 and ozone absorption features
Air Mass Factor and vertical column calculation
Volcanic AMF
function of plume height and SO2 load
plume heights: 2.5, 6 and 15 km
Calculation of vertical SO2 column using cloud correction
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GOME-2 tropospheric NO2
pre-operational status; operational status: Nov. 2008initial validation with ground-based measurements
Total SO2: pre-operational status planned for Nov. 2008
GOME-2 tropospheric Ozone: preliminary results
GOME-2 level-2 (pre-)operational products available via:EUMETCast (near-real time)UMARF (off-line)
GOME-2 NO2 and SO2 products (level-3 and value-added):
World Data Centre WDC-RSAT
Conclusions
o3msaf.fmi.fi
wdc.dlr.de/sensors/gome2