# Presentation: 170357

## Update of the SAUNA campaign

- R. McPeters

- Aura Science Team Meeting, Columbia, MD
- October 27, 2008

##   SAUNA 1 & 2: the Sodankyla Total Column Ozone Intercomparison

**March 27 – April 14, 2006 & February 5 - 22, 2007**
-  Organized by NASA, FMI and ES
-  Hosted by the Finnish Meteorological Institute Arctic Research  Center, Sodankyla, Finland (67.37N, 26.63E)
-  Purpose: Need to verify the accuracy of ground-based measurements for satellite validation purposes
-  Satellite measurements agree within 2-3% globally
-  Differences at low sun, high column ozone amounts, high reflectivity

- 4 Brewers + SAOZ

- 2 Dobsons

## SAUNA analysis in progress:

- Total column ozone analysis (Bojkov)
- Double Brewer vs single vs Dobson
- OMTO3 and DOAS ozone vs groundbased
- OMI profile comparison (McPeters)
- Compare lidar and sonde with satellite ozone profiles
- Produce OMI profiles using SBUV v8 algorithm

## Stray light
Affects single Brewers and Dobsons
SAUNA derived slant-column “correction” (Bojkov)

Cross section differences (Bhartia)
Bass-Paur errors and T-dependence
Use of Mallicet / Daumont must be investigated
Recommend review by Johannes Orphal
Workshop meeting Geneva, May 2009
Need better band pass info for Dobson (Evans)
Brewer weights
Kerr data not fully reproducible from Bass-Paur

SZA > 80°
LOS becomes the issue
ozonesondes and LIDAR become the reference of choice

- Affects single Brewers and Dobsons
- SAUNA derived slant-column “correction” *(Bojkov)*
- Cross section differences *(Bhartia)*
- Bass-Paur errors and T-dependence
- Use of Mallicet / Daumont must be investigated
- Recommend review by Johannes Orphal
- Workshop meeting Geneva, May 2009
- Need better band pass info for Dobson *(Evans)*
- Brewer weights
- Kerr data not fully reproducible from Bass-Paur
- SZA > 80°
- LOS becomes the issue
- ozonesondes and LIDAR become the reference of choice

- Total ozone results: Dobson/Brewer

## Brewers: March 30 ‘06

- Bojan.R.Bojkov@nasa.gov

- single Brewers

- Stray light

- double Brewers

## Ozone profile results

- NOAA 16 SBUV/2
-  distance < 300 km on 18 days of 34 total
-  0.5 – 50 hPa
-  sondes – daily
-  launch near the noon Aura pass
-  surface to ~4 hPa
-  MLS
-  distance < 300 km on 21 days of 27 total
-  0.5 – 315 hPa
-  Goddard ozone lidar
-  profiles on only 3 nights in 2006
-  profiles on 10 nights in 2007
-  ~2.0 – 244 hPa
-  Integrated total column ozone used as quality control check:
-  Brewer + Dobson – almost daily
-  OMI – daily, very good spatial match
-  SAOZ – sunrise & sunset
**First comparison of profiles from OMI**

-  NOAA 16 SBUV/2
-  distance < 300 km on 18 days of 34 total
-  0.5 – 50 hPa
-  sondes – daily
-  launch near the noon Aura pass
-  surface to ~4 hPa
-  MLS
-  distance < 300 km on 21 days of 27 total
-  0.5 – 315 hPa
-  Goddard ozone lidar
-  profiles on only 3 nights in 2006
-  profiles on 10 nights in 2007
-  ~2.0 – 244 hPa
-  Integrated total column ozone used as quality control check:
-  Brewer + Dobson – almost daily
-  OMI – daily, very good spatial match
-  SAOZ – sunrise & sunset

-  NOAA 16 SBUV/2
-  distance < 300 km on 18 days of 34 total
-  0.5 – 50 hPa
-  sondes – daily
-  launch near the noon Aura pass
-  surface to ~4 hPa
-  MLS
-  distance < 300 km on 21 days of 27 total
-  0.5 – 315 hPa
-  Goddard ozone lidar
-  profiles on only 3 nights in 2006
-  profiles on 10 nights in 2007
-  ~2.0 – 244 hPa
-  Integrated total column ozone used as quality control check:
-  Brewer + Dobson – almost daily
-  OMI – daily, very good spatial match
-  SAOZ – sunrise & sunset

-  NOAA 16 SBUV/2
-  distance < 300 km on 18 days of 34 total
-  0.5 – 50 hPa
-  sondes – daily
-  launch near the noon Aura pass
-  surface to ~4 hPa
-  MLS
-  distance < 300 km on 21 days of 27 total
-  0.5 – 315 hPa
-  Goddard ozone lidar
-  profiles on only 3 nights in 2006
-  profiles on 10 nights in 2007
-  ~2.0 – 244 hPa
-  Integrated total column ozone used as quality control check:
-  Brewer + Dobson – almost daily
-  OMI – daily, very good spatial match
-  SAOZ – sunrise & sunset

## Slide 7

**Notes:**
NOAA 16 SBUV/2 was 810 km away from MLO on this day

## Slide 8

## Sodankylä was in a tongue of low ozone on February 20. The SBUV profile measured 840 km to the east was in better agreement with the sonde profile than the SBUV profile measured 170 km west. 

- SBUV fov
- 170 km west

- SBUV fov
- 840 km east

- Sodankylä was in a tongue of low ozone on February 20. The SBUV profile measured 840 km to the east was in better agreement with the sonde profile than the SBUV profile measured 170 km west.

## Can ozone profiles be retrieved from the OMI short wavelength data?

- UV-1   270 nm – 310 nm @ 0.42 nm
- UV-2   310 nm – 365 nm @ 0.45 nm
- Vis      365 nm – 500 nm @ 0.63 nm

## The profiles retrieved from OMI have significant scattered light contamination. Correction is being refined.