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1 Operational O3M-SAF trace-gas column products: GOME-2 tropospheric NO 2, Ozone, and total SO 2 AT2 Seventh Workshop Helsinki, Sep. 30 - Oct. 1, 2008.

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Presentation on theme: "1 Operational O3M-SAF trace-gas column products: GOME-2 tropospheric NO 2, Ozone, and total SO 2 AT2 Seventh Workshop Helsinki, Sep. 30 - Oct. 1, 2008."— Presentation transcript:

1 1 Operational O3M-SAF trace-gas column products: GOME-2 tropospheric NO 2, Ozone, and total SO 2 AT2 Seventh Workshop Helsinki, 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

2 2 Outline GOME-2 tropospheric NO 2 column product algorithm description recent results for China and initial validation GOME-2 tropospheric ozone column algorithm description example of tropical tropospheric ozone from biomass burnings GOME-2 total SO 2 column product algorithm description examples of volcanic SO 2 from recent eruptions Conclusions

3 3 GOME-2 tropospheric NO 2 column product Pre-operational status Operational status planned for Nov. 2008 Tropospheric NO 2 column algorithm NO 2 slant column density with DOAS method fitting window: 425-450 nm Estimation of stratospheric NO 2 component using spatial filtering Tropospheric AMF based on MOZART-2 NO 2 climatology (Univ. Bremen) Calculation of tropospheric NO 2 column using cloud correction GOME-2 cloud parameters OCRA cloud fraction ROCINN cloud-top height and albedo

4 4 Comparison of tropospheric NO 2 in China 20072008 Jun 12 - Jun 30 Jul 20 - Aug 7

5 5 GOME-2 tropospheric NO 2 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

6 6 Initial validation with ground-based measurements MAXDOAS at Obs. de Haute Provence (43.9°N, 5.7°E)

7 7 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)

8 8 GOME-2 tropical tropospheric ozone column Tropospheric Ozone Tropospheric NO2 September, 2007 ATSR hot spots Southern hemisphere biomass burnings

9 9 GOME-2 SO 2 column product Pre-operational status planned for Nov. 2008 SO 2 slant column algorithm SO 2 slant column density with DOAS method fitting window: 315-326 nm Background correction interference of SO 2 and ozone absorption features Air Mass Factor and vertical column calculation Volcanic AMF function of plume height and SO 2 load plume heights: 2.5, 6 and 15 km Calculation of vertical SO 2 column using cloud correction

10 10 Eruption of Mt. Etna (11 - 14 May 2008) May 11 - 13May 14

11 11 Eruption of Kasatochi (8 August 2008)

12 12 Eruption of Kasatochi (8-25 August 2008)

13 13 GOME-2 tropospheric NO 2 pre-operational status; operational status: Nov. 2008 initial validation with ground-based measurements Total SO 2 : 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 NO 2 and SO 2 products (level-3 and value-added): World Data Centre WDC-RSAT Conclusions o3msaf.fmi.fi wdc.dlr.de/sensors/gome2

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