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

1
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 Hawaii),
• Brent Holben, Norm O'Neill, Bruce McArthur and
  Alain Royer (AERONET)
• yohei_at_hawaii.edu

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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

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Consistency check
AATS-14
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AOD above P-3 (measured with AATS-14) 0.033
An example of extinction profile See also HSRL
talk.
PRELIMINARY DATA Clarke, McNaughton, Freitag,
Howell et al.
Layer AOD over aircraft altitudes (500 6250 m
GPS) 0.201 at 550 nm
AOD below P-3 0.005 (150 m 30.5 Mm-1)
500
350 (Surface)
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HiGEAR layer AOD was typically within 10 0.02
of the AATSs 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 0.02 11 agreement -10 - 0.02
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Camsell Viking fires north of Lake Athabasca
Time 192.8937
Marker size proportional to dry scattering
2127
2137
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.
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PEARL at Eureka
P-3 and AERONET AODs agreed within 0
(excellent!) 0.02 (good) during 3 fly-over
events, at all wavelengths but 1.6 um.
AERONET PIs Holben, O'Neill, McArthur and Royer
Fort McMurray
Saturn Island off Vancouver
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MODIS
660 550 470 nm
15 0.05
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-15 - 0.05
(HiGEAR extinction radar altitude)
MODIS 3-km resolution product from Remer and
Mattoo.
MODIS underestimated the AOD in some pixels.
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MISR
Many more validation opportunities with
MODIS, MISR, OMI and CALIPSO are being looked
into. See Redemanns talk and poster.
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aerosol composition and smoke type
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White smoke from smoldering fires
White smoldering and black flaming identified
based on Tony Clarkes flight report.
Dark smoke from flaming fires
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Smoke after evolution, or pollution from other
sources? To be investigated.
White smoke from smoldering fires
Aerosol evolution in downwind transport?
Characterization of smoke types and age with the
wavelength dependence of scattering and SSA
Dark smoke from flaming fires
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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 .