Preprints
https://doi.org/10.5194/amt-2020-475
https://doi.org/10.5194/amt-2020-475

  07 Dec 2020

07 Dec 2020

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Airborne Lidar Observations of Wind, Water Vapor, and Aerosol Profiles During The NASA Aeolus Cal/Val Test Flight Campaign

Kristopher M. Bedka1, Amin R. Nehrir1, Michael Kavaya1, Rory Barton-Grimley1, Mark Beaubien6, Brian Carroll5, James Collins2, John Cooney5, G. David Emmitt3, Steven Greco3, Susan Kooi2, Tsengdar Lee4, Zhaoyan Liu1, Sharon Rodier2, and Gail Skofronick-Jackson4 Kristopher M. Bedka et al.
  • 1NASA Langley Research Center, Hampton, VA
  • 2Science Systems and Applications, Inc., Hampton, VA
  • 3Simpson Weather Associates, Charlottesville, VA
  • 4NASA Headquarters, Washington D.C.
  • 5NASA Postdoctoral Fellowship Program, Universities Space Research Association at NASA Langley Research Center, Hampton, VA
  • 6Yankee Environmental Systems, Inc., Turners Falls, MA

Abstract. Lidars are uniquely capable of collecting high precision and high spatio-temporal resolution observations that have been used for atmospheric process studies from the ground, aircraft, and space for many years. The Aeolus mission, the first space-borne Doppler wind lidar, was developed by the European Space Agency and launched in August 2018. Its novel Atmospheric LAser Doppler INstrument (ALADIN) observes profiles of the component of the wind vector and aerosol/cloud optical properties along the instrument’s line-of-sight (LOS) direction on a global scale. Two airborne lidar systems have been developed at NASA Langley Research Center in recent years that collect measurements in support of several NASA Earth Science Division focus areas. The coherent Doppler Aerosol WiNd (DAWN) lidar measures vertical profiles of LOS velocity along selected azimuth angles that are combined to derive profiles of horizontal wind speed and direction. The High Altitude Lidar Observatory (HALO) measures high resolution profiles of atmospheric water vapor (WV), and aerosol and cloud optical properties. Because there are limitations in terms of spatial and vertical detail and measurement precision that can be accomplished from space, airborne remote sensing observations like those from DAWN and HALO are required to fill these observational gaps as well as to calibrate and validate space-borne measurements.

Over a two-week period in April 2019 during their Aeolus Cal/Val Test Flight campaign, NASA conducted five research flights over the Eastern Pacific Ocean with the DC-8 aircraft. The purpose was to demonstrate: 1) DAWN and HALO measurement capabilities across a range of atmospheric conditions, 2) Aeolus Cal/Val flight strategies and comparisons of DAWN and HALO measurements with Aeolus to gain an initial perspective of Aeolus performance, and 3) how atmospheric dynamic processes can be resolved and better understood through simultaneous observations of wind, WV, and aerosol profile observations, coupled with numerical model and other remote sensing observations. This paper provides a brief description of the DAWN and HALO instruments, discusses the synergistic observations collected across a wide range of atmospheric conditions sampled during the DC-8 flights, and gives a brief summary of the validation of DAWN, HALO, and Aeolus observations and comparisons.

Kristopher M. Bedka et al.

 
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Kristopher M. Bedka et al.

Kristopher M. Bedka et al.

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Short summary
This paper demonstrates: 1) Doppler Aerosol WiNd (DAWN) lidar and High Altitude Lidar Observatory measurement capabilities across a range of atmospheric conditions, 2) comparisons of DAWN and HALO measurements with Aeolus satellite Doppler wind lidar to gain an initial perspective of Aeolus performance, and 3) how atmospheric dynamic processes can be resolved and better understood through simultaneous observations of wind, WV, and aerosol profile observations.