# Presentation: 673704

## SMR versus MLS O3

**SMR versus MLS O3**
- B. Barret, P. Ricaud, E. Le Flochmoën
- Laboratoire d’Aérologie / Observatoire Midi-Pyrénées, Toulouse, France

## SMR radiances @ 576.4 GHz 

**SMR radiances @ 576.4 GHz**

- Mid-latitude SH
- 32.7°S / 48.2°E

- High latitude SH
- 80.9°S / 105.2°E

- 2004-25-08

**CO**
- 576.268 GHz

**O3**
- 576.515 GHz

- ~ 20 km

- ~ 31 km

- ~ 42 km

- ~ 70 km

## SMR O3 @ 576.5 GHz 

- High latitude SH
- 80.9°S / 105.2°E

- 2004-25-08

- Mid-latitude SH
- 32.7°S / 48.2°E

**SMR O3 @ 576.5 GHz**

- Res. ~ 1.5 km

- Res. ~ 6 km

- 15-70 km

## SMR O3 /MLS: selection of data

- SMR (reference code)
- Measurement response > 0.75
- Good convergence
- MLS (V1.5 L2 data quality and description document)
- Status = 0 + clouds (p < 100 hPa)
- Precision > 0
- Quality > 0.10
- Coincidence criteria
- Distance < 500 km
-  t < 6 hours

##  SMR O3@576.5 /MLS: zonal means

##  SMR O3@576.5 /MLS : correlations

*** *****SMR O3@576.5 /MLS : correlations**

## Mean profiles
Excellent agreement from 100 to 1 hPa
MLS slightly > SMR in the lower stratosphere
MLS > SMR above 1 hPa in NH  bias up to 60%
SMR noisier than MLS

Correlations
R > 0.7 from 100 to 6.8 hPa
Slope MLS/SMR ~ 0.6 in this region

- Excellent agreement from 100 to 1 hPa
- MLS slightly > SMR in the lower stratosphere
- MLS > SMR above 1 hPa in NH  bias up to 60%
- SMR noisier than MLS
- Correlations
- R > 0.7 from 100 to 6.8 hPa
- Slope MLS/SMR ~ 0.6 in this region

*** *****SMR O3@576.5 /MLS : summary**

## SMR radiances @ 544.6 GHz 

- Urban et al., JGR 2005

## SMR O3 @ 544.9 GHz 

- Res. ~ 1.5 km

- Res. ~ 6 km

- 15-70 km

- Urban et al., JGR 2005

##  SMR O3@544.9 /MLS : zonal means

*** *****SMR O3@544.9 /MLS : zonal means**

##  SMR O3@544.9 /MLS : correlations

*** *****SMR O3@544.9 /MLS : correlations**

## Mean profiles
Good agreement from 100 to 1 hPa
MLS > SMR ~ 20% from 30 to 1 hPa at high lat. 
MLS < SMR up to 40% above 20 hPa in the tropics and at mid. Lat.
MLS > SMR below ~ 30 hPa at all latitudes
SMR noisier than MLS

Correlations
R > 0.8 from 100 to 6.8 hPa
Slope MLS/SMR  ~ 0.7 in this region

- Good agreement from 100 to 1 hPa
- MLS > SMR ~ 20% from 30 to 1 hPa at high lat.
- MLS < SMR up to 40% above 20 hPa in the tropics and at mid. Lat.
- MLS > SMR below ~ 30 hPa at all latitudes
- SMR noisier than MLS
- Correlations
- R > 0.8 from 100 to 6.8 hPa
- Slope MLS/SMR  ~ 0.7 in this region

*** *****SMR O3@544.9 /MLS : summary**

## SMR radiances @ 501.8 GHz 

- Urban et al., JGR 2005

## SMR O3 @ 501.5 GHz 

- 17-45 km

- Res. ~ 2.5 km

- 78.4°S/143.8°E

- 30.4°S/346.1°E

- Urban et al., JGR 2005

##  SMR O3@501.5 /MLS : zonal means

*** *****SMR O3@501.5 /MLS : zonal means**

##  SMR O3@501.5 /MLS : correlations

*** *****SMR O3@501.5 /MLS : correlations**

## Mean profiles
Good agreement in the SMR altitude range
SMR > MLS from 46 hPa to 10 hPa (< 20%) 
SMR very noisy

Correlations
R > 0.8 from 31.6 to 6.8 hPa
Slope MLS/SMR  ~ 0.7 in this region

- Good agreement in the SMR altitude range
- SMR > MLS from 46 hPa to 10 hPa (< 20%)
- SMR very noisy
- Correlations
- R > 0.8 from 31.6 to 6.8 hPa
- Slope MLS/SMR  ~ 0.7 in this region

*** *****SMR O3@501.5 /MLS : summary**