# Presentation: 905037

## Bojan R. BojkovGEST/NASA GSFC

- Bojan R. BojkovGEST/NASA GSFC

## SAUNA campaign

- Organized by NASA, FMI and ESA
- Hosted by the Finnish Meteorological Institute Arctic
- 	Research Center at Sodankylä, Finland
- Boreal climate, Arctic atmosphere
- 30+ Scientists from 10 Institutions and 9 Countries:
*NASA-GSFC (USA), FMI-ARC (Finland), ESA-ESRIN (Italy),*
*BIRA-IASB (Belgium), CNRS-SA (France),*
*DWD-MOHp (Germany), INM-Izana (Spain),*
*KNMI (Netherlands), MSC (Canada), NOAA-ESRL (USA)*
- Funding/Sponsors:
*NASA-HQ, FMI, and ESA*
*EOS-Aura Project Science Office*
*National contributions from Canada, France and Spain*

## Driving issue:

- Why do total column ozone measurements from groundbased and satellite instruments and their respective retrieval algorithms continue to differ at mid and high latitudes, and where large solar zenith angles and high total ozone amounts are typical?

## Campaign instruments

| Instrument | Principal Investigator | Affiliation |
| --- | --- | --- |
| Brewer (single monochromator at FMI-ARC) | E. Kyrö | FMI-ARC (Finland) |
| Brewer: 1 single (World standard), 1 double | T. McElroy | MSC (Canada) |
| Brewer: double | A. Cede/R. McPeters | NASA GSFC (USA) |
| Brewer: 1 double (European Standard) | A. Redondas/E. Cuevas | INM-Izaña (Spain) |
| Dobson (Traveling standard) | R. Evans | NOAA-ESRL/GMD (USA) |
| Dobson (European standard) | U. Koehler | DWD-MOHp (Germany) |
| DOASs:  1 UV, 1 vis, 1 miniDOAS | M. van Roozendael | BIRA-IASB (Belgium) |
| miniDOAS | E. Brinksma | KNMI (Netherlands) |
| SAOZ (permanently located at FMI-ARC) |  F. Goutail | CNRS-SA (France) |
| STROZ-Lite LIDAR (NDSC standard) | T. McGee | NASA-GSFC (USA) |
| Ozonesondes | R. Kivi
B.R. Bojkov
E. Brinksma | FMI-ARC (Finland)
NASA-GSFC (USA)
KNMI (Netherlands) |

## FMI-ARC facilitiesduring SAUNA

- FMI-ARC facilitiesduring SAUNA

- Tower with miniDOASs

- NASA LIDAR

- Sounding station

- Dobsons

- Campaign instruments

## March 26-April 13, 2006

- March/April did provide:
*Total ozone columns in the range 400DU to ~520DU*
*High variability/strong gradients*
*12-16 hour measurement days*
*Minimum solar zenith angle of 65 degrees*
*75% clear sky (12 of 18 good days!)*
- Up to 3 overpasses for swath instruments

**X**

- OMI ozone
- March 26, 2006

## Ozone layer variability

- P. Heikkinen, FMI

## Brewers

- ~100 coincident clear day 5 instrument measurements
*Measurement range: 400-520DU*
*Slant column range: 900-2200DU*
*0.5% accuracy and 0.3% precision (combined dataset)*
- Result: stray light corrections for single Brewers
*Single shows ~1% error at 1000DU slant column and ~5% error at 2000DU*
*Correction for measurements when slant column > 900DU*
*Critical for satellite validation *

- Photo: E. Brinksma, KNMI

## Typical Brewer day during SAUNA

## Slide 10

## “Measured” data

- Stray-light corrected data

## Satellite profile comparisons

- Comparison to be performed with LIDAR and sonde data
- 4 AURA instr.
*Focus on TES*
*	**and HIRDLS*
- ENVISAT
*GOMOS, MIPAS*
*	**and Sciamachy*
- NOAA SBUV/2s

- Worden/Osterman, JPL

## Conclusions

- Exceptional efforts and organization by all SAUNA teams, and in particular the local hosts at FMI-ARC
- Very interesting results
*Single Brewer stray-light correction*
*Good coincidence with Aura instruments*
- Continued investigations ongoing
- SAUNA workshop at Tenerife (November 2006)

## Participants, Contributors and Co-authors

- NASA GSFC
*B. Bojkov, R. McPeters, A. Cede,*
*	**D. Haffner, J. Herman, T. McGee,*
*	**D. Silbert, G. Sumnicht,  M. Yan*
- FMI
*E. Kyro, R. Kivi, O. Aulamo,*
*	**P. Heikkinen, J. Kahru, T. Koskela*
- ESA
*C. Zehner*
- BIRA-IASB
*M. van Roozendael, C. Fayt,*
*	**C. Hermanns, J.-C. Lambert,*
*	**G. Pinnardi*

- CNRS-SA
*F. Goutail, **D. Ionov*
- DWD-MOHp
*U. Koeh**ler,** **B. Hassler*
- INM-Izana
*A. Redondas, E. Cuevas,*
*	**C. Guirado, C. Torres*
- KNMI
*E. Brinksma*
- MSC
*T. McElroy, V. Savastiouk,*
*	**D. Tarasick*
- NASA-JPL
*G. Ostermann*
- NOAA ERL GMD
*R. Evans, B. Walsh*

- Photo: F. Goutail