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)