aerosol optical properties measured from aircraft, satellites and the ground during arctas - their...

Aerosol optical properties measured from aircraft, satellites and the ground during ARCTAS - their

relationship to aerosol chemistry and smoke type

Yohei Shinozuka*, Jens Redemann, John Livingston, Phil Russell, Roy Johnson, S Ramachandran (NASA Ames),

Tony Clarke, Cameron McNaughton, Steffen Freitag, Steve Howell, Volodia Kapustin, Vera Brekhovskikh (University of Hawai’i),

Brent Holben, Norm O'Neill, Bruce McArthur and Alain Royer (AERONET)*yohei@hawaii.edu

In this talk…

• Consistency check among the P-3 aircraft, ground and satellite observations of spectral aerosol optical depth (AOD)

• Optical characterization of aerosol composition and smoke type

CONSISTENCY CHECK

AATS-14

An example of extinction profileSee also HSRL talk.

350 (Surface)

AOD below P-3:0.005 (150 m * 30.5 Mm-1)

AOD above P-3 (measured with AATS-14):0.033

500

Layer AOD over aircraft altitudes (500 – 6250 m GPS) : 0.201 at 550 nm

PRELIMINARY DATAClarke, McNaughton, Freitag, Howell et al.

HiGEAR layer AOD was typically within 10% + 0.02 of the AATS’s for the 35 spiral vertical profiles with altitude gain/loss greater than 1 km under clear sky with AATS and HiGEAR instruments running.

PRELIMINARY

+10% + 0.021:1 agreement-10% - 0.02

Time = 192.8937

HiGEAR Dry Scattering 4000 Mm-1 at 550 nm, AATS AOD 2.5 at 519 nm in the smoke.

The high spatial variability prevented agreement between AATS and HiGEAR.

21:27 21:37

Marker size proportional to dry scattering

Camsell & Viking fires north of Lake Athabasca

PEARL at Eureka

Saturn Island off Vancouver

Fort McMurray

AERONET PIs: Holben, O'Neill, McArthur and Royer

P-3 and AERONET AODs agreed within 0 (excellent!) – 0.02 (good) during 3 fly-over events, at all wavelengths but 1.6 um.

660 550 470 nm

1:1

-15% - 0.05

+15% + 0.05

MODIS 3-km resolution product from Remer and Mattoo.(HiGEAR extinction * radar altitude)

MODIS

MODIS underestimated the AOD in some pixels.

MISR

Many more validation opportunities with MODIS, MISR, OMI and CALIPSO are being looked into. See Redemann’s talk and poster.

AEROSOL COMPOSITION AND SMOKE TYPE

Dark smoke from flaming fires

White smoke from smoldering fires

White smoldering and black flaming identified based on Tony Clarke’s flight report.

Dark smoke from flaming fires

White smoke from smoldering fires

Aerosol evolution in downwind transport?

Characterization of smoke types and age with the wavelength dependence of scattering and SSA

Smoke after evolution, or pollution from other sources? To be investigated.

Summary

• AATS and HiGEAR layer AODs typically agreed within 10% + 0.02.

• Smoke can prevent AOD agreement.• P-3 and AERONET AODs agreed within 0 – 0.02 for all

visible wavelengths for 3 of the fly-over events.• Comparison with satellite observations is in progress.• Smoke type and age may be characterized by the

wavelength dependence of scattering and SSA .