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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 10 | Copyright
Atmos. Meas. Tech., 7, 3487-3496, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Oct 2014

Research article | 10 Oct 2014

Airborne Multiwavelength High Spectral Resolution Lidar (HSRL-2) observations during TCAP 2012: vertical profiles of optical and microphysical properties of a smoke/urban haze plume over the northeastern coast of the US

D. Müller1,2, C. A. Hostetler3, R. A. Ferrare3, S. P. Burton3, E. Chemyakin2, A. Kolgotin4, J. W. Hair3, A. L. Cook3, D. B. Harper3, R. R. Rogers3, R. W. Hare3, C. S. Cleckner3, M. D. Obland3, J. Tomlinson5, L. K. Berg5, and B. Schmid5 D. Müller et al.
  • 1University of Hertfordshire, Hatfield, Hertfordshire, UK
  • 2Science Systems and Applications, Inc., NASA Langley Research Center, Hampton, VA, USA
  • 3NASA Langley Research Center, Hampton, VA, USA
  • 4Physics Instrumentation Center, Troitsk, Russia
  • 5Pacific Northwest National Laboratory, Richland, WA, USA

Abstract. We present measurements acquired by the world's first airborne 3 backscatter (β) + 2 extinction (α) High Spectral Resolution Lidar (HSRL-2). HSRL-2 measures particle backscatter coefficients at 355, 532, and 1064 nm, and particle extinction coefficients at 355 and 532 nm. The instrument has been developed by the NASA Langley Research Center. The instrument was operated during Phase 1 of the Department of Energy (DOE) Two-Column Aerosol Project (TCAP) in July 2012. We observed pollution outflow from the northeastern coast of the US out over the western Atlantic Ocean. Lidar ratios were 50–60 sr at 355 nm and 60–70 sr at 532 nm. Extinction-related Ångström exponents were on average 1.2–1.7, indicating comparably small particles. Our novel automated, unsupervised data inversion algorithm retrieved particle effective radii of approximately 0.2 μm, which is in agreement with the large Ångström exponents. We find good agreement with particle size parameters obtained from coincident in situ measurements carried out with the DOE Gulfstream-1 aircraft.

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