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BrO Total Comumn

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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, Differenceequation, 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, Differenceequation, 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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