First impressions on First impressions on Brewer processing Brewer processing methods surveymethods surveyTomi KarppinenCOST WG1/WG2 meetingManchester, 27. September 2013
RepliesRepliesBy 24th September, 9 repliesArosa (Swizerland), Rome U
(Italy), ARPA Valle d’Aosta (Italy), Athens (Greece), RMIB (Belgium), SMHI (Sweden), IPMA (Portugal), Manchester U (Engand), FMI (Finland)
Low overall cover but very helpful
Ozone softwareOzone softwareVariety of processing tools
◦Brewer operating software (for realtime for many, for some no further processing)
◦O3Brewer (2 final, 1 for daily diagnostics)
◦Brewer processing software, BPS by Env. Canada (2 final)
◦Self developed software (4, in C, Excel(VBA, Modula2) and Matlab)
Ozone processing levelsOzone processing levelsRaw collected and archived for
everyone?Basic processing, Brewer operating
softw.Corrections and notes
◦ETC correced with SL-test (smooth vs. step)◦Quality flagged (std, unrealistic, clouds)
End products◦Daily mean/selected daily value◦All measurements◦Ds, zs, fz, gi ?
UV softwareUV softwareNot processed regularly(3)Rd_ux3d (2)UVBrewer (2)SHICrivm (4, for wavelength shift
and spectral anomaly)Self developed (5, in perl, Matlab,
IDL and C)
UV processing levelsUV processing levelsRaw counts Irradiance spectrumCorrections for
◦ Temperature◦ Cosine error◦ Stray light (subtract short wl intensity, 5
wavelengths?)◦ Wavelength shift and spikes
End products◦ Spectra◦ Daily dosages (differently weighted)◦ UV-index◦ More?
AOD softwareAOD softwareNot processed regularly or at all
(4)Brewer operating sw (2)O3Brewer (2)O3Baod (1)Self developed scripts (2, in C
and Fortran)
AOD processing levelsAOD processing levelsBrewer operating sw (very basic?)Own software can take into
account◦Cloud screening◦Realistic Rayleigh scatter◦Calibrated ETC◦Earth-Sun –distance◦Value and value change screening as
unrealistic
UmkehrUmkehrRegular measurements (3/9)Not regularly processedSoftware
◦C-code by McElroy◦O3Bumkehr
NONO22
For Mk IV only?N2ds measurements on visible
wavelegthsProcessing software by Diemoz
SOSO22
Rarely processedDetectable only in urban
enviroments?◦Volcanic ash clouds & fires?
Calibration constants up to date?Attention needed?
ConclusionsConclusionsDiverse practisesConcentration areas, for example
◦Mk IV NO2◦Belgium & Italy AOD
Everyone does Ozone, but at different levels?
Data coherence?◦Algorithms, boundary conditions,
corrections, calibration frequency, schedules …
Future?Future?Recommendations and practises or tools
and software?◦ Own routines vs. new ones
Software flexibility◦ Platform for new procedure tryout, needs to be
accessible for modification◦ New software or build on some existing software?
Can we reach the same level if there are no possibilities to process complitely due to lack of supporting information (cloud screening, ozonesondes, response tracking etc)