SCIAMACHY Product Handbook
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| 6.3.2.3 BrO Total Column |
| Retrieval settings summary: | LO-1c settings | | Calibration | All calibrations applied except radiometric calibration and m-factors | | SMR | A0 | | DOAS settings | | Fitting Interval | 336 - 351 nm | | Wavelength Shift | Cross correlation according to Chance and Spurr solar line atlas | | Polynomial Degree | 3rd order | | Absorption Cross Sections / Fitted Curves | | NO2 | Bogumil et al, Temperature = 243 K | | O3 | Bogumil et al. 243 k, shifted | | O3 Difference spectrum | T = 223 K, Difference , shifted | | O2 - O2 | Greenblatt et al. (1990); Wavelength axis corrected by Burkholder | | BrO | Fleischmann et al. (2004), T=223K | | Ring Spectrum | Vountas at al. (1998) | | Empirical Functions | Eta Nadir Key Data | | Offset and slope correction | Inverse Earthshine | | Total Column Calculation: Profiles / AMF | | AMF ref. wavelength | 343.5 nm | | BrO Profile | Stratospheric profiles from Theys et al. (2009) | | Radiative Transfer Model | LIDORT | | CTH, COT, CTA | SACURA | | Cloud Fractions | OCRA | |
| 6.3.2.4 SO2 Total Column |
| Retrieval settings summary: | LO-1c settings | | Calibration | All calibrations applied except applied radiometric calibration and m-factors | | SMR | A0 | | DOAS settings | | Fitting Interval | 315 - 327 nm | | Polynomial Degree | 3rd order | | Absorption Cross Sections / Fitted Curves | | SO2 | Vandaele et al. (1994) | | Background Database | Initially empty | | O3 | Bogumil et al. 243 K | | O3 Difference spectrum | T = 223 K, Difference, shift allowed | | Undersampling | Constant Undersampling Spectrum calculated by IUP-Bremen | | Ring Spectrum | Vountas et al. (1998) | | Background Ref. Sector | 180 - 200 deg (Pacific) | | Empirical Functions | Eta NAdir (angle =) | | Offset and slope correction | Inverse Spectrum of Earthshine radiance | | Total Column Calculation: Profiles / AMF | | AMF ref. wavelength | 315 nm | | SO2 Profile Anthropogenic | Pollution scenario: 1 DU present from surface to 1 km height | | SO2 Profile Volcannic | Eruption scenario: 10 DU present in layer between 10 and 11 km | | Radiative Transfer Model | LIDORT | | CTH, Cloud Top | Not applied, ghost column set to 0 | | Cloud Fraction | Not applied | |
| SO2 slant columns retrieved with DOAS are known to have an offset to the correct values that is dependent from latitude and time. This error can be corrected by subtracting the offset values from the retrieved slant columns. For determination of the offset it is assumed that no SO2 is present over the Pacific, in the so called reference sector. The values from the reference sector (i.e. the assumed offsets) are stored in SO2DB as background values. For details see (Richter 2006). | | | |
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