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Institut für Umweltphysik (iup) AMFIC Kick-off Meeting, 26 October 2007, KNMI, The Netherlands Carbon monoxide columns and methane column- averaged mixing.

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Presentation on theme: "Institut für Umweltphysik (iup) AMFIC Kick-off Meeting, 26 October 2007, KNMI, The Netherlands Carbon monoxide columns and methane column- averaged mixing."— Presentation transcript:

1 Institut für Umweltphysik (iup) AMFIC Kick-off Meeting, 26 October 2007, KNMI, The Netherlands Carbon monoxide columns and methane column- averaged mixing ratios retrieved from SCIAMACHY near-infrared nadir spectra Michael Buchwitz, Oliver Schneising, Iryna Khlystova, John P. Burrows Institute of Environmental Physics (IUP) / Institute of Remote Sensing (IFE), University of Bremen, Bremen, Germany

2 Institut für Umweltphysik (iup) Outline AMFIC project: Our WPs, tasks & deliverables SCIAMACHY instrument Retrieval methode: WFM-DOAS (WFMD) Status carbon monoxide (CO WFMD version 0.6) Status methane (CH4 WFMD version 1.0) Available data products and formats

3 Institut für Umweltphysik (iup) AMFIC project related overview I From DoW: WP: 2.2 „Infrared retrievals“ – Carbon monoxide and methane columns from SCIAMACHY 9/2007 KO 9/2008 Quality assessment Algorithm improvements Processing Final product generation Delivery WP 3 Validation WP: 2.2 Deliverables: D2.7: CO columns, focus 2003-2004, month 12 (9/2008) D2.8: Methane columns, focus 2003-2004, month 12 (9/2008) D2.9: Final report, month 13 (10/2008)

4 Institut für Umweltphysik (iup) AMFIC project related overview II Status SCIAMACHY CO & methane retrieval when AMFIC proposal was written (mid 2006): „Only“ one year was processed, 2003 (e.g. within EU 5th FP project EVERGREEN) Versions: CO WFMDv0.5, CH4 WFMDv0.5 (Buchwitz et al., ACP, 2006) Some problems had been identified, e.g.: CO: Some significant biases relative to ground-based FTS (Dils et al., ACP, 2006) Methane: Solar zenith angle dependent bias (few percent) (Buchwitz et al., ACP, 2006) Proposed activities for AMFIC: Further studies, retrieval algorithm improvements, delivery of improved data sets (focus: 2003 & 2004) Current status: Improved data sets: CO WFMDv0.6 (Buchwitz et al., ACP, 2007), methane WFMDv1.0 (manuscript in preparation), 2003-2005 First validation using ground-based FTS (7 European stations, 2003-2004) (Dils et al., ACVE-3, 2006) Ongoing & future activities: Quality assessments, assessment of usefulness for AMFIC project

5 Institut für Umweltphysik (iup) SCIAMACHY on ENVISAT SCIAMACHY Scanning Imaging Absorption Spectrometer for Atmospheric CHartographY Horizontal resolution: CH 4 & CO 2 : ~30x60km 2 (0.25s) CO: ~30x120km 2 (0.5s)

6 Institut für Umweltphysik (iup) SCIAMACHY nadir spectrum Wavelength [nm] Channels 1-6 Channel 7 Channel 8 Sun-normalized radiance CH4 CO2 CH4 CO2 CO O2 N2O

7 Institut für Umweltphysik (iup) Retrieval algorithm WFM-DOAS (“WFMD”)

8 Institut für Umweltphysik (iup) Carbon monoxide from single orbit

9 Institut für Umweltphysik (iup) SCIAMACHY CO: yearly average

10 Institut für Umweltphysik (iup) CO WFMDv0.6: First validation using 7 European ground-based FTS SCIA_CO_WFMDv0.6 SCIA_CO_WFMDv0.5 FTS Dils et al., ACVE-3, 2006 SCIA-FTS20032004 Bias+9.2%+0.5% Scatter+/-20%

11 Institut für Umweltphysik (iup) SCIAMACHY CO: Comparison with MOPITT

12 Institut für Umweltphysik (iup) CO & methane altitude sensitivity & CO NIR vs TIR Averaging kernels: dV ret /dV(z) true O‘Brien, 2005 2364 nm Coheur et al., 2005 NIR/SWIRTIR

13 Institut für Umweltphysik (iup) Single ground pixel CO & CO spectral fit Buchwitz et al., ACP, 2007

14 Institut für Umweltphysik (iup) SCIAMACHY CO over China

15 Institut für Umweltphysik (iup) SCIAMACHY CO2 & O2 absolute columns -> Column-averaged dry air mole fraction XCO2 [ppm] XCO2 := CO2column / AIRcolumn; AIRcolumn = O2column/20.95% Similar approach for methane: XCH4 [ppb]: XCH4 := CH4column / AIRcolumn; AIRcolumn = CO2column/370ppm

16 Institut für Umweltphysik (iup) SCIAMACHY methane: Yearly average

17 Institut für Umweltphysik (iup) SCIAMACHY methane 2003: Comparison with TM5

18 Institut für Umweltphysik (iup) SCIAMACHY methane 2003: Comparison with TM5 JFM AMJ JAS OND SCIA CO2=constSCIA CO2=CarbonTrackerTM5(S1)

19 Institut für Umweltphysik (iup) SCIAMACHY methane over China

20 Institut für Umweltphysik (iup) SCIAMACHY NIR channel issues Kleipool et al., IR Phys.&Technol., 2007 SOST website: http://www.iup.uni-bremen.de/sciamachy/LTM/LTM.html Dead & bad detector pixelsIce layer issue (channel 8)

21 Institut für Umweltphysik (iup) SCIAMACHY CO & methane timeseries Buchwitz et al., ACP, 2007 Carbon monoxideMethane

22 Institut für Umweltphysik (iup) Available data products & formats SCIAMACHY/WFM-DOAS data products: CO cols. v0.6, XCH4 & XCO2 v1.0 Global, 3 years (2003-2005) Three levels of data: Level 2a: Swath (= indiv. ground pixel), 1 file/orbit, QUAL=all Level 2b: Swath, 1 file/month, QUAL=good Level 3: Gridded 0.5x0.5, monthly resolution, QUAL=good 4 files / month: Main product (CO column or XCH4 or XCO2) Mean fit error Standard deviation Number of points / grid cell

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