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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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Comparison of tropospheric NO2 in China

2007 2008

Jun 12 -

Jun 30

Jul 20 -

Aug 7

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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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Eruption of Mt. Etna (11 - 14 May 2008)May 11 - 13 May 14

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Eruption of Kasatochi (8 August 2008)

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Eruption of Kasatochi (8-25 August 2008)

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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