# Presentation: 936832

## ARCTAS P-3B Overview: 

**With contributions from:**
**Jens Redemann, John Livingston, Yohei Shinozuka, Steve Howell, Cam McNaughton, Eike Bierwirth, Sebastian Schmidt, Ralph Kahn, Charles Gatebe, Alexei Lyapustin, Thanos Nenes, Terry Lathem, Rich Ferrare, Chris Hostetler, Ed Eloranta, Norm O’Neill, Omar Torres, Pepijn Veefkind, Ben Veihelmann ****...**

**ARCTAS P-3B Overview: **
**Goals, Payload, Flights, and Example Results**

**ARCTAS****Science Team Meeting****27-30 Jan 2009****Virginia Beach, VA**

**Phil Russell and ****Tony Clarke**
**P-3B Platform Scientists**

## P-3B in ARCTAS

_**P-3B in ARCTAS**_

_**Overall Goal**_
**Measurements and analyses to address ARCTAS science**
** ****Theme 3:**** ****Aerosol Radiative Forcing**** **
**	****including indirect aerosol forcing via clouds**
** ****Theme 2: Boreal Forest Fires**
**while also contributing to ARCTAS’s**
** **
**Theme 1: Long-Range Transport of Pollution to the Arctic **
**Theme 4: Chemical Processes**

## P-3B in ARCTAS

_**Joint POLARCAT-ARCTAS objectives**_

_**P-3B in ARCTAS**_

**Vertical layering**** of Arctic pollution, ****associated **_**optical properties **_**and the**** related **_**physiochemistry of Arctic aerosol**_
_**Direct radiative effects**_** within pollution and smoke layers in the Arctic**
**Size resolved properties of cloud condensation nuclei (CCN) and interactions of aerosols with clouds**** and their impact on ****radiative forcing**
_**Reflectance &**__** **__**albedo of snow, ice & other surfaces**__** **_**and compare to available surface-based measurements of snow albedo/reflectance**
**Study impact of ****boreal forest fire emissions**** on the ****composition of the troposphere**** and on ****concentrations of soot, organics and ionic species**
**Determine the ****lofting, transport and evolution ****of smoke aerosol ****physiochemistry**** and associated ****optical properties**
**Validate aerosol, trace gas, and cloud products of space observations from polar orbiting satellites**

## P-3B in ARCTAS

_**P-3B in ARCTAS**_

_**Science objectives (long list) required**_**:**
**- Measuring**
**	****-- Aerosol chemical, physical & optical properties**
**	****-- Aerosol radiative effects**
**	****-- Arctic surface albedo & bidirectional reflectance**
**	****-- ++**
** ****Testing, interpreting, & extending satellite retrievals**
** ****Testing & refining chemical transport models (CTMs)**
_**Approach**_** **
**Fly a **_**balanced suite**_** of **_**radiometric**_** & **_**in situ **_**instruments on a **_**single platform**_**. This enabled:**
** ****All the above**
** ****Climate forcing assessment in terms of emissions and/or mitigation strategies**

## P-3B in ARCTAS: Payload

**P-3B in ARCTAS: Payload**

| Ames Airborne Tracking 
Sunphotometer (AATS-14) | Solar Spectral Flux Radiometer (SSFR) | Broad-Band Radiometers (BBR)
LW          SW |
| --- | --- | --- |
| HiGEAR Aerosols & O3
 OPC & DMA dry size dist, volatility 
 Tandem Volatility DMA
 Neph scat + PSAP abs
 Humidified Neph f(RH)
 Ultrafine  & CN
 Time of Flight Mass Spec size resolved chemistry
 SP2  black carbon mass  | AERO3X | Cloud Absorption Radiometer (CAR) |
| P-3 Data System (PDS): Nav, Flight, Met (P, T, RH, ...) |  | REVEAL & RTMM |

****** ****AOD**
**** **Ext**
**  ****H****2****O **
** ****vapor**

** ****Cavity Ringdown ext (2********)**
** ****Reciprocal Neph sca (2********, **RH **)**

****** ****Radiance, BRDF**

****** ****Flux****↑****,****↓****(********), albedo(********)**

****** ****Flux****↑****,****↓****, albedo**

** ****Nenes CCN**
** ****PVM cloud drop r****eff****, vol**
** ****TECO ****O****3**

**COBALT:****  ****CO**

## ARCTAS Spring P-3 Tracks, 

**ARCTAS Spring ****P-3**** Tracks, **
**31 Mar-10 Apr 2008**

**Fair-**
**banks**

**Wallops**

**Moffett**

**Yellowknife**

**Thule**

**Barrow**

**8 flights (61 hrs)**

## ARCTAS Summer P-3 Tracks, 

**ARCTAS Summer ****P-3**** Tracks, **
**24 Jun-12 Jul 2008**

**See Clarke et al. **
**CARB flight poster**

**Also Nenes talk**
** ****and/or Lathem poster**

**Wallops**

**Cold Lake**

**LA**

**SF**

**14 flights (87 hrs) **

## P-3 Science/Transit Flights in ARCTAS Spring

| Data Flt 
No. | Date,
2008 | Track | Comments |
| --- | --- | --- | --- |
| 3 | 31 
Mar | Wallops-Yellowknife | CO structure at several altitudes over & S of Great Lakes. Arctic haze aerosols, incl dust. |
| 4 | 1 
Apr | Yellowknife-Fairbanks | CO & aerosol plume as predicted by models. Spiral & legs under CALIPSO, OMI track.  |
| 5 | 6 
Apr | Fairbanks-Barrow-Fairbanks | Spiral & legs under B-200 & CALIPSO, OMI. Square spiral & radiation legs. Albedo, BRDF at Elson Lagoon w AERONET. |
| 6 | 8 
Apr | Fairbanks-Thule | DC-8 comparison in stairsteps. Spiral over Eureka under CALIPSO, OMI w AERONET. Albedo, BRDF. |

**http://www.espo.nasa.gov/arctas/flightDocs.php**

## Presentations showing P-3B ARCTAS results

**2**_**Bierwirth et al**_**., Spectral surface albedo and aerosol forcing during ARCTAS - Implications of surface heterogeneity and SSFR measurement uncertainty**
**2**_**Clarke et al**_**., ****Combustion aerosol in the Arctic: models, size-resolved microphysics, chemistry, and relationships to CCN variability**
**2**_**Clarke et al**_**., ****California Coastal Aerosol during ARCTAS-CARB:**
**	****Ships, Wildfires and Background Air**
**2**_**Ferrare et al**_**., ****HSRL measurements of smoke during ARCTAS**
**2**_**Gatebe et al**_**., Simultaneous retrieval of aerosol and surface properties over snow**
**2**_**Howell et al**_**., Arctic aerosol chemistry and spectral optical characteristics: mixtures of major ions with black, brown and organic carbon  **
**2**_**Kahn et al**_**.: ARCTAS Snow Albedo Experiment**
**2**_**Lathem et al**_**.: Closure and growth kinetics of ARCTAS CCN measurements**
**1****EOS Aura 2008 Science Team meeting, Columbia, MD, 27-30 Oct 2008 **
**2****ARCTAS Science Team Meeting, Virginia Beach, 27-30 Jan 2009**

_**Cont’d**__****_

## Presentations showing P-3B ARCTAS results (cont’d)

**2**_**Lyapustin et al**_**.:** **Snow anisotropy from CAR: Analysis of LSRT, MRPV, and AART BRF models**
**2**_**Nenes et al**_**., CCN measurements during ARCTAS **
**1**_**Livingston et al**_**., ****Comparison of Airborne Sunphotometer and OMI Retrievals of Aerosol Optical Depth during MILAGRO/INTEX-B and ARCTAS**
_**2**__**Podolske et al**_**., CO measurements from the P3-B during ARCTAS**
**2**_**Redemann et al**_**., ****Airborne sunphotometer (AATS-14) measurements in ARCTAS - first insights into their combined use with satellite observations to study Arctic aerosol radiative effects  **
**2**_**Shinozuka et al**_**., Aerosol optical properties measured from aircraft, satellites and the ground during ARCTAS summer - their relationship to aerosol chemistry and smoke type**
**1****EOS Aura 2008 Science Team meeting, Columbia, MD, 27-30 Oct 2008 **
**2****ARCTAS Science Team Meeting, Virginia Beach, 27-30 Jan 2009**
**1****EOS Aura 2008 Science Team meeting; October 27-30, 2008; Columbia , MD**
**2****ARCTAS Science Team Meeting, Virginia Beach, 27-30 Jan 2009**

_**Presentations showing P-3B ARCTAS results (cont’d)**_

## Example Science Results- 2 Spring Flights- 2 Summer Flights(See also other talks & posters)

_**P-3B in ARCTAS**_

## P-3 Science/Transit Flights in ARCTAS Spring (cont’d)

| Data Flt 
No. | Date,
2008 | Track | Comments |
| --- | --- | --- | --- |
| 7 | 9 Apr | Thule-Fairbanks | Square spiral on CALIPSO, OMI track. BRDF & albedo, ice & cloud. AOD gradient & stack. CO & aerosol structure in predicted plume.  |
| 8 | 13 Apr | Fairbanks-North-Fairbanks | Cloud albedo & BRDF. In situ aerosol & CO in Asian transport episode to test models.  |
| 9 | 15 Apr | Fairbanks-Barrow-Fairbanks | Comparison & radiation stack w NOAA P-3 under B-200. Cascade impactor. Albedo, BRDF at Elson Lagoon with surface-based meas & AERONET. Zero ozone over open leads. 6 special albedo sites. Radiation leg on CALIPSO, OMI track.   |
| 10 | 19 Apr | Fairbanks-Moffett over Pacific | DC-8 comparison on CALIPSO, OMI track. Steps in DC-8 lidar curtain. Square spiral during CALIPSO, OMI OP.  Aerosol gradients predicted by models. |

## P3 Data Flight #9, 15 Apr 2008

**AOD, 0Z,7/8**

**P3 Data Flight #9, 15 Apr 2008**

_**Accomplishments**_**:**
**Comparison w ****NOAA WP-3D ****under ****B-200**** **
**Radiation stack with ****NOAA WP-3D**** under ****B-200**** (with sufficient AOD & no hi/mid clouds) **
**Cascade impactor sample during 1, 2 for Raman & SEM analysis**
**Radiation leg along CALIPSO track (before overpass)**
**Albedo & BRDF measurements at Elson Lagoon over surface-based albedo & snow collection measurements**
**Zero ozone over open leads N & W of Elson Lagoon (2x)**
**Overflights of special albedo sites F1, B3, G4(x2), B4, F4, L1 (with variety of cloud conditions)**
**Extra radiation legs along return to Fairbanks**

**1,2,3**

**8**

**5**

**6**

**4**

**7**

**Elson Lagoon**

**Albedo sites**

**CALIPSO track**

**P-3**

**B-200**

**WP-3D**

**Fairbanks**

## 20080415 – “Silver Day” (Spring)

- Flux Divergence legs with NOAA P-3

- Flux Divergence legs

- CALIPSO (under clouds)

- Terra and Aqua overpass

- Characterization of Elson Lagoon / Barrow, and other sites as specified by BU

- Mountain Site “L1”

**See Bierwirth Talk**

## Solar Spectral Flux Radiometers (SSFRs) on NASA & NOAA P-3s under B-200

**Solar Spectral Flux Radiometers (SSFRs) on NASA & NOAA P-3s under B-200**

- Wing tip by wing tip comparison NOAA and NASA P-3 SSFR on three flight legs

- NASA P-3 *below* layer, NOAA P-3 *above*

- Wing by wing above layer

- Wing by wing in layer

- downward

- upward

- Flying over snow patches / tundra – this will be an excellent case to study surface albedo heterogeneity.

**See Bierwirth Talk**

**Bierwirth, Schmidt, Pilewskie, Gore, ...**

** ****Irradiance [W m****-2**** nm****-1****]**

**UTC [h]**

## P3 Data Flight #9, 15 Apr 2008

**AOD, 0Z,7/8**

**P3 Data Flight #9, 15 Apr 2008**

_**Accomplishments**_**:**
**Comparison w ****NOAA WP-3D ****under ****B-200**** **
**Radiation stack with ****NOAA WP-3D**** under ****B-200**** (with sufficient AOD & no hi/mid clouds) **
**Cascade impactor sample during 1, 2 for Raman & SEM analysis**
**Radiation leg along CALIPSO track (before overpass)**
**Albedo & BRDF measurements at Elson Lagoon over surface-based albedo & snow collection measurements**
**Zero ozone over open leads N & W of Elson Lagoon (2x)**
**Overflights of special albedo sites F1, B3, G4(x2), B4, F4, L1 (with variety of cloud conditions)**
**Extra radiation legs along return to Fairbanks**

**1,2,3**

**8**

**5**

**6**

**4**

**7**

**Elson Lagoon**

**Albedo sites**

**CALIPSO track**

**P-3**

**B-200**

**WP-3D**

## See Kahn 

**MISR ****Path 079 Orbit 44293  Blocks 32-38;   Lat 71.3 ̊ Lon -156.7;  SZA 61.1 ̊  **

**See Kahn **
**Talk**

**See Gatebe talk & Lyapustin poster re **
**snow anisotropy retrieved from CAR measurements on P-3 at Elson Lagoon near Barrow**

**Elson Lagoon**

**Special Albedo**
**Sites **

**Zero ozone over open leads X2**

## Lyapustin et al. poster

**Lyapustin et al. poster**

**Snow BRF at Elson Lagoon, Barrow, AK, 6 Apr 2008**
** ****retrieved from CAR on P-3**

## See 

**Satellite-Based Barrow Region Surface Classification**

- G – Coastal Plain sites; elevation ~10m
- B – Tundra with many lakes; elevation ~25m
- F – Dissected Plateau; elevation ~160m
- L – Mountainous; elevation ~1.5 km, very variable

- Schaff et al., BU Team

**See **
**Kahn **
**Talk**

## See Kahn 

**MISR ****Path 079 Orbit 44293  Blocks 32-38;   Lat 71.3 ̊ Lon -156.7;  SZA 61.1 ̊  **

**See Kahn **
**Talk**

## See Kahn Talk

**Barrow 15 April  22:30 UTC**
**MISR ****Path 079 Orbit 44293  Blocks 32-38;   Lat 71.3 ̊ Lon -156.7;  SZA 61.1 ̊  **

**See Kahn Talk**

## Surface albedo spectra from SSFR on NASA P-3

**Surface albedo spectra from SSFR on NASA P-3**

**See Bierwirth Talk**

**Bierwirth, Schmidt, Pilewskie, Gore, ...**

- G – Coastal Plain sites; elevation ~10m
- B – Tundra with many lakes; elevation ~25m
- F – Dissected Plateau; elevation ~160m
- L – Mountainous; elevation ~1.5 km, very variable

**Albedo**

**Wavelength [nm]**

**15 Apr 2008**

## How to proceed with surface albedo?

- Coddington et al., *JGR*, 2008

**Example from MILAGRO data (2006) MODIS/SSFR/Ground truth**
- Need to consider structure (variability) and correct for various error sources
- to connect satellite, aircraft, and ground truth. One possibility is to go through a statistical field generator (Venema, 2006) that can help connect scales.

- Error bars reflect variability within SSFR footprint

**See Bierwirth Talk**

## P-3 Science/Transit Flights in ARCTAS Spring

| Data Flt 
No. | Date,
2008 | Track | Comments |
| --- | --- | --- | --- |
| 3 | 31 
Mar | Wallops-Yellowknife | CO structure at several altitudes over & S of Great Lakes. Arctic haze aerosols, incl dust. |
| 4 | 1 
Apr | Yellowknife-Fairbanks | CO & aerosol plume as predicted by models. Spiral & legs under CALIPSO, OMI track.  |
| 5 | 6 
Apr | Fairbanks-Barrow-Fairbanks | Spiral & legs under B-200 & CALIPSO, OMI. Square spiral & radiation legs. Albedo, BRDF at Elson Lagoon w AERONET. |
| 6 | 8 
Apr | Fairbanks-Thule | DC-8 comparison in stairsteps. Spiral over Eureka lidar & AERONET under CALIPSO, OMI. Albedo, BRDF. |

**http://www.espo.nasa.gov/arctas/flightDocs.php**

## P3 Data Flight #6, 8 Apr 2008

**AOD, 0Z,7/8**

**P3 Data Flight #6, 8 Apr 2008**

_**Accomplishments**_**:**
**Sampled Asian & N American aerosol composition for model comparison**
**DC-8**** comparison in stairsteps**
**Spiral over ****Eureka lidar ****& ****AERONET**** ****during ****CALIPSO**** overpass**
**Surface albedo & BRDF**

**4**

**2**

**3**

**Thule**

**Fairbanks**

**Eureka**

**P-3**

**DC-8**

**1**

**1**

## Nenes, Lathem re CCN

***Aerosol Mass Spectrometer reveals different mix of aerosol chemistry for Asian and North American Pollution***

- STEM model AOD - Carmichael

**Asian**

**N. America**

**P3b-DC8**
**Intercomp**

- Eureka
- Calipso
- Spiral

**CAR**
**BRDF**
**Circles**

**Antony Clarke**
** ****Steve Howell**
**  ****Cam McNaughton**
**    ****Steffen Freitag**

**P3b  Fairbanks –Thule Flight6 4/8/08**
**Airmass chemistry-optics, DC-8 comparison, Calipso, **
**BRDF surface- albedo and model validation**

- Preliminary AMS data

**Nenes, Lathem re CCN**
**Podolske re CO**

**See Howell Talk**

## See Kahn Talk

- PEARL CIMEL

- Ed Eloranta's
- AHSRL profiles
- (532 nm)

-  [m-1 sr-1]

- light cloud

- April 8, 2008

- (500 nm)

**E. Eloranta**

**N. O’Neill **

**See Kahn Talk**

**Pearl 08 April  20:41 UTC**
**MISR ****Path 062 Orbit 44190  Block 22;   **
**Lat 80.05 ̊ Lon -86.42;  SZA 75.2 ̊  **

- Pearl AERONET Site

- P-3 Flight Path

**Eureka**

## PRELIMINARY

**Profile over the PEARL lab AERONET site in Eureka**

**Shinozuka, Redemann, Clarke, O’Neill, ...**

**See Shinozuka Talk**

## P-3 Science/Transit Flights in ARCTAS Summer (cont’d)

| Data Flt 
No. | Date,
2008 | Track | Comments |
| --- | --- | --- | --- |
| 17 | 30 Jun | Cold Lake-NE-Cold Lake | CALIPSO, OMI underflight w AOD & in situ. Black & white smoke. In situ & radiation under B-200. BRDF over smoke pall. Asian pollution w dust as predicted by models. |
| 18 | 2 Jul | Cold Lake-NE & E-Cold Lake | Radiation work under B-200. Aerosol evolution in downwind transport. Pyrocumulus. |
| 19 | 3 Jul | Cold Lake-Ft. McMurray-Reindeer Lake-Cold Lake | Ft McMurray AERONET spiral in regional biomass haze. MODIS-MISR-MOPITT spiral. B-200 + CALIPSO, OMI spiral. Radiation stack. Forest BRDF. Fresh smoke sampling + downwind evolution. Radiation-AOD-in situ ramp. |

## ARCTAS P-3 Data Flight #19, 3 Jul 2008

- 220 km

**PRELIMINARY**

**ARCTAS P-3 Data Flight #19, 3 Jul 2008**
**Characterized physics, chemistry and optics of  local and long-distance plume in Terra MISR & MODIS  footprints**

**AATS- AOD profile**

**HiGEAR- in situ scattering**

**Typical P-3 maneuvers in ARCTAS**

## PRELIMINARY

*Analysis by Yohei Shinozuka*

**ARCTAS P-3 Data Flight #19, 3 Jul 2008**
**3-way agreement of data to test satellite retrievals **

**See **
**Shinozuka **
**Talk**

**Shinozuka, Redemann, Clarke, McArthur, ...**

## See 

- low absorption layer

- high absorption layer

**Bierwirth, Schmidt, Redemann, Livingston, ...**

**See **
**Bierwirth **
**Talk**

**499 nm**

**Slope is **
**aerosol radiative forcing **
**efficiency**

**Aerosol Radiative Forcing Efficiency**
**by combining**
**SSFR Irradiance with AATS Aerosol Optical Thickness**

**3 Jul 2008**

**Aerosol Optical Thickness**

**Net  Irradiance [W m****-2**** nm****-1****]**

## Absorption Spectrum

- water vapor absorption

- aerosol absorption

- O2

- O2 -O2

**Bierwirth, **
**Schmidt, **
**Pilewskie, **
**Gore, ...**

**See **
**Bierwirth **
**Talk**

**Absorption Spectrum**
**From SSFR divergence of net irradiance**

**Absorbed  Irradiance  [W m****-2**** nm****-1****]**

**Wavelength [nm]**

**3 Jul 2008**

## P-3 Science/Transit Flights in ARCTAS Summer (cont’d)

| Data Flt 
No. | Date,
2008 | Track | Comments |
| --- | --- | --- | --- |
| 20 | 6 Jul | Cold Lake-Great Slave-Athabaska-Cold Lake | Radiation profiles & legs under Terra. BRDF of blue & muddy water. Cloud edges under B-200. Dense smoke spirals under B-200. Radiation stacks. CAR in cloud. PyroCu outflow. |
| 21 | 7 Jul | Cold Lake-British Columbia-Cold Lake | Radiative forcing efficiency of Asian/Siberian plume. Aerosol effects on MODIS-Terra cloud sensing. Tests of model aerosol, CO, & O3 predictions. Radiation stacks. CAR circles over AERONET. In situ-AATS-AERONET spiral. |
| 22 | 9 Jul | Cold Lake-Reindeer Lake-Athabaska-Cold Lake | Spirals & radiation legs under Terra-MISR. Radiation legs + stacks in fire plumes under B-200 + CALIPSO, OMI, MODIS. Black & white smoke.  |

## NRL COAMPS PREDICTED SMOKE FROM ATHABASKA FIRES (courtesy Jeff Reid)

**Turnaround Point**

**NRL COAMPS PREDICTED SMOKE FROM ATHABASKA FIRES** **(courtesy Jeff Reid)**

- GEOS5 - Weak Siberia biomass burning plume between 1-6 km in central Canada, Courtesy Mian Chin - Similar features in some other models.

**18 Z 9 Jul 2008**

***P-3B***
***B200***

***CALIPSO Track***

## See Ferrare Talk

***9 July 2008: B200 and P-3B underfly the CALIPSO track sampling smoke plume from boreal fires in northern Saskatchewan.  ***

**Turnaround Point**

***P-3B***
***B200***

***CALIPSO Track***

**See Ferrare Talk**

## See Ferrare Talk

**Extinction**

**Smoke layer**

**Optical Thickness**

***HSRL/AATS-14 Aerosol Optical Thickness (AOT) Comparison***

-  Comparison of AOT derived from HSRL (B200) and derived from AATS-14 Airborne Sun Photometer (P-3B) while P-3B spiraled up below B200 (AATS14 data courtesy of Jens Redemann)
-  Large variability in AOT associated with smoke plume

_**Preliminary**_

**See Ferrare Talk**

## See Ferrare Talk

**Extinction**

**Smoke layer**

** ****Comparison of aerosol extinction derived from HSRL (B200) and         in situ dry scattering (neph) + absorption (PSAP) measurements while P-3 spiraled up below B200 (in situ data courtesy of Tony Clarke) **

_**Preliminary**_

**See Ferrare Talk**

## See Ferrare Talk

***Aerosol Comparison***

**Extinction**

**Smoke layer**

- Good agreement in and above the smoke!  CALIPSO slightly lower

***Ferrare, Hostetler, Winker, Redemann, Clarke et al.***

_**Preliminary**_

**See Ferrare Talk**

## MODIS

***MODIS***

***OMI***

***CALIPSO***

## Comparison of AATS, OMI, and MODIS AOD spectra

**Comparison of AATS, OMI, and MODIS AOD spectra**

_**Preliminary**_

- J. Redemann, J. Livingston, Torres, Veihelmann, Veefkind

**See Redemann**
**Talk**

## Comparison of AATS and MODIS AOD spectra

**Comparison of AATS and MODIS AOD spectra**

_**Preliminary**_

- J. Redemann, J. Livingston

**See Redemann**
**Talk**

## Special thanks to the P-3B staff 

**ARCTAS P-3B Summary & Future**

**8 flights (61 hrs) in Spring,**
**	****14 flights (87 hrs) in Summer. **
**	****Highly successful.**
**2.****	****The rich data set links air, surface, & space measurements and addresses all P-3B goals **
**	****- ****linking variations in **_**atmospheric radiation**_** to **_**microphysics and chemistry**_** of haze & smoke **_**aerosols**_** + Arctic **_**surfaces**_**. **
**	****Needed for **
**	****	****--reliable interpretations of satellite inversions **
**	****	****--refining model products **
**	****	****--assessing climate forcing in terms of emissions and/or mitigation strategies.**
**3. See other talks & posters**
**4.****	****ARCTAS Special Sessions: AGU Fall 2009**

**Special thanks to the P-3B staff **
**for excellent preparation, maintenance, & flying**

## END OF PRESENTATION

**END OF PRESENTATION**

**REMAINING SLIDES ARE BACKUP**

## P-3B in ARCTAS

_**P-3B in ARCTAS**_

_**Approach**_** **
**Use a **_**common platform**_** to link variations in **
_**atmospheric radiation**_** to **_**microphysics and chemistry**_** of aerosol + **_**Arctic surfaces **_
**Such linked measurements are needed for:**
** ****Reliable interpretations of satellite inversions**
** ****Refining model products  **
** ****Climate forcing assessment in terms of emissions and/or mitigation strategies**

## See Kahn Talk

**MISR ****Path 046 Orbit 44189  Block 25;   Lat 80.05 ̊ Lon -86.42;  SZA 73.0 ̊  **

**Pearl 08 April  20:41 UTC**
**MISR ****Path 062 Orbit 44190  Block 22;   Lat 80.05 ̊ Lon -86.42;  SZA 75.2 ̊  **

**Eureka**

**See Kahn Talk**

## See Kahn Talk

**Pearl 08 April  20:41 UTC**
**MISR ****Path 062 Orbit 44190  Block 22;   Lat 80.05 ̊ Lon -86.42;  SZA 75.2 ̊  **

**Eureka**

**See Kahn Talk**

- P-3 Flight Path

## E. Eloranta

- PEARL CIMEL

- Ed Eloranta's
- AHSRL profiles
- (532 nm)

-  [m-1 sr-1]

-  [%]

- light cloud

- April 8, 2008

- Arctic haze
- skullduggery?

- (500 nm)

**E. Eloranta**

**N. O’Neill **