# Presentation: 685890

## DC-8 Sunphotometer Measurements ofOzone, Water Vapor, and AerosolCompared to Satellite and Other MeasurementsJohn Livingston1, Phil Russell2 , B. Schmid3, J. Eilers2, R. Kolyer2, J. Redemann3, S. Ramirez3, J-H. Yee4, C. Trepte5, L. Thomason5, M. Pitts5, J. Zawodny5, W. Chu5, M. Avery5, C. Randall6, J. Lumpe7, R. Bevilacqua8, G. Diskin5, J. Podolske2, M. Bittner9, T. Erbertseder9, R. McPeters10, R.Shetter11  1SRI International, Menlo Park, CA, 2NASA Ames Research Center, Moffett Field, CA, 3Bay Area Environmental Research Institute, Sonoma, CA, 4Applied Physics Laboratory, Johns Hopkins University, Laurel, MD,  5NASA Langley Research Center, Hampton, VA, 6Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, 7Computational Physics, Inc., Springfield, VA, 8Naval Research Laboratory, Washington, DC, 9DLR (German Aerospace Center), Oberpfaffenhofen, Germany, 10NASA Goddard Space Flight Center, Greenbelt, MD, 11NCAR, Boulder, CO

**Orlando, FL, 21-24 October 2003**

**DC-8 Sunphotometer Measurements of****Ozone, Water Vapor, and Aerosol****Compared to Satellite and Other Measurements****John Livingston****1****, **_**Phil Russell**_**2 ****, B. Schmid****3****, J. Eilers****2****, R. Kolyer****2****, J. Redemann****3****, S. Ramirez****3****, J-H. Yee****4****, C. Trepte****5****, L. Thomason****5****, M. Pitts****5****, J. Zawodny****5****, W. Chu****5****, M. Avery****5****, C. Randall****6****, J. Lumpe****7****, R. Bevilacqua****8****, G. Diskin****5****, J. Podolske****2****, ****M. Bittner****9****, T. Erbertseder****9****, R. McPeters****10****, R.Shetter****11**** **** ****1****SRI International, Menlo Park, CA, ****2****NASA Ames Research Center, Moffett Field, CA****, ****3****Bay Area Environmental Research Institute, Sonoma, CA, ****4****Applied Physics Laboratory, Johns Hopkins University, Laurel, MD,  ****5****NASA Langley Research Center, Hampton, VA, ****6****Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, ****7****Computational Physics, Inc., Springfield, VA, ****8****Naval Research Laboratory, Washington, DC, ****9****DLR (German Aerospace Center), Oberpfaffenhofen, Germany, ****10****NASA Goddard Space Flight Center, Greenbelt, MD, ****11****NCAR, Boulder, CO**

## Based primarily on 2 posters:

**OL 10, Livingston et al., Ozone**
**IV 13, Russell, Livingston et al.: Aerosol & Water Vapor **

**•****	****MD   1, Avery**
**• ****MD 21, Yee**
**• ****OL 19, Shetter**
**•****	****PS   4, Diskin **

**Also many others:**

**•****	****IV   1, Anderson **
**•****	****IV   7, Pitts **
**• ****IV   9, Randall**
**• ****IV 12, Reeves **

## AATS-14 on DC-8 in SOLVE II

**AATS-14 on DC-8 in SOLVE II**

**14-channel Ames Airborne Tracking Sunphotometer**

## Slide 4

## Slide 5

## Ames Sunphotometer (AATS-14) on DC-8 in SOLVE II

**Ozone**
**Aerosol**
**Water Vapor**

**Spatial Structure**
**Spectra vs Wavelength**
**Vertical Profiles**

_**8 Successful Science Flights:  Example Results**_

## Ozone Retrieval Method (Simplified)

**Ozone Retrieval Method (Simplified)**

## Brewer Data Courtesy of Ken Lamb, International Ozone Services

## AATS-14/SAGE III Coincidences in SOLVE II

## DC-8 Flight Path, 24 Jan 2003, SOLVE II

**DC-8 Flight Path, 24 Jan 2003, SOLVE II**

- SAGE III

- POAM

- Kiruna

## 24 Jan

**24 Jan**

## DC-8 Flight Path, 24 Jan 2003, SOLVE II

**DC-8 Flight Path, 24 Jan 2003, SOLVE II**

- SAGE III

- POAM

- Kiruna

## Slide 13

## DC-8 Flight Path, 21 Jan 2003, SOLVE II

- SAGE III

- POAM

**DC-8 Flight Path, 21 Jan 2003, SOLVE II**

- Kiruna

## GOME

## GOME

**Useful capability to validate e.g., OMI on Aura**

-  **Closest TOMS Locations**

**TOMS**

##  UV

- DC-8 flight track

-  **UV**

-  **Chappuis**

-  **PRELIMINARY**

## GAMS, SAGE III from Larry Thomason and Mike Pitts

-  **PRELIMINARY**

## DC-8 Flight Path, 21 Jan 2003, SOLVE II

- SAGE III

- POAM

**DC-8 Flight Path, 21 Jan 2003, SOLVE II**

- Kiruna

## 21 Jan

**21 Jan**

## Ames Sunphotometer (AATS-14) on DC-8 in SOLVE II

**Ozone**
_**Water Vapor**_
**Aerosol**

**Spatial Structure**
**Vertical Profiles Spectra vs Wavelength**

_**8 Successful Science Flights:  Example Results**_

## Slide 23

## (Glenn Diskin and Jim Podolske)

## Ames Sunphotometer (AATS-14) on DC-8 in SOLVE II

**Ozone**
**Water Vapor**
_**Aerosol**_

**Spatial Structure**
**Vertical Profiles Spectra vs Wavelength**

_**8 Successful Science Flights:  Example Results**_

## Airmass is very sensitive to vertical distribution

- If AATS optical depth (OD) is too sensitive to airmass, we may do
- SAGE III validation comparisons in _path OD_, rather than vertical OD.

**Airmass is very sensitive to vertical distribution**
**When sun is near horizon (SZA > 89°)**

- Airmass  ODsun-viewing path / ODvertical ,
- assuming homogeneity in spherical shells

## DC-8 Flight Path, 21 Jan 2003, SOLVE II

- SAGE III

- POAM

**DC-8 Flight Path, 21 Jan 2003, SOLVE II**

- Kiruna

## Preliminary

******X  < 60 km**

**POAM**

**AATS**

## DC-8 Flight Track, 19 Jan 2003 

**DC-8 Flight Track, 19 Jan 2003 **

- 12Z, 19 Jan 2003, 460K

- Kiruna

- SAGE III

- POAM

## Russell, Livingston et al., Poster 13, Fri AM

**Russell, Livingston et al., Poster 13, Fri AM**

**SAGE**

**AATS**

## Frost on AATS window?

**Strong purging with dry N****2**** --always**
**Window heater power increase**

_**Prevention measures:**_

_**Tests conducted for frost presence:**_

**Change altitudes. Derive Ext****AATS**** as ********AOD/********z.  Does Ext****AATS ****= Ext****SAGE****? No. Ext****AATS ****> Ext****SAGE ****. **
**Scan AATS FOV across sun.  Do FOV traces have “frost dips”? No.**
**Check dependence of AOD****AATS****-AOD****SAGE ****on channel. Does it scatter like early frost cases? No. **

**How does AOD****AATS****-AOD****SAGE ****depend on airmass? 1/m?**** **
**What do in situ data say re Ext(********) at DC-8 altitude?**

_**Further Tests (to be conducted)**_

## Future Work

**More comparisons to DIAS (Shetter) & GAMS (Pitts et al.) **
**Publish comparisons to SAGE III, POAM III, GOME, TOMS (several papers)**

_**Ozone:**_

_**Water vapor:**_

**Begin comparisons to satellites (e.g., SAGE III, POAM III, ...)**

_**Aerosol:**_

**Use in situ meas (Anderson, Reeves) to test for expected Ext (incl ********-dep) at DC-8 altitudes **
**Test airmass-dependence of AATS-SAGE differences: on window or in atmosphere?**

## Slide 33

## Slide 34

## Slide 35

## Window ice coating

- V= V0 e-maa e-mrr e-mgg Tice
- AODtrue = AODcalc + log(Tice)/maer
- _Conclusion_
- 		Calculated AOD will vary with airmass 	if transmission through ice is constant, 	even if true AOD is constant

## Slide 37

## Slide 38

## Slide 39

## Slide 40

## Slide 41

## Slide 42

## Preliminary

- SAGE III

- 19 Jan 2003  SAGE III: 9.87 UT, 69.31 N, 24.20 E

- (SZA ~89.7°)

******X  < 100 km**

## X < 100 km          

******X < 100 km**

## Slide 45

## Slide 46

## X < 60 km          

******X < 60 km**