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GOME tropospheric BrO data


GOME tropospheric BrO V1.0


For the European project THALOZ, a complete time series of GOME tropospheric BrO columns has been created which can be downloaded as gridded monthly averages. 

These files are encrypted, for the password please contact Andreas Richter.

GOME tropospheric BrO columns Version 1:

This data set uses several approximation for the tropospheric BrO columns:

  • for correction of the stratospheric contribution, stratospheric BrO columns derived from a dedicated SLIMCAT run at the time of GOME overpass are subtracted
  • no cloud treatment is implemented yet
  • a stratospheric airmass factor is used which gives appropriate values over bright surfaces but leads to an underestimation of BrO over dark surfaces such as open ocean
  • the tropospheric BrO column has been normalized to be close to 0 over the equatorial Pacific. The normalisation is needed to account for artefacts introduced by the GOME diffuser plate
  • there is a known interference from HCHO. Areas with large atmospheric HCHO columns yield too low BrO columns
  • the presence of a tropospheric background of about 1 ppt leads to apparently enhanced columns over bright clouds
  • only forward scan measurements at solar zenith angle < 80° are included to optimise spatial resolution and sensitivity to the troposphere

For a description of the method used to derive BrO columns, please see the references below.

References:

Contact Andreas Richter.

web master:  folkard@iup.physik.uni-bremen.de      Last Update: 25-05-18      Data Privacy