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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-108
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 May 2018

Research article | 23 May 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).

A fully autonomous ozone, aerosol and night time water vapor LIDAR: a synergistic approach to profiling the atmosphere in the Canadian oil sands region

Kevin B. Strawbridge1, Michael S. Travis1, Bernard J. Firanski1, Jeffrey R. Brook1, Ralf Staebler1, and Thierry Leblanc2 Kevin B. Strawbridge et al.
  • 1Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, ON, Canada
  • 2California Institute of Technology, Jet Propulsion Laboratory, Wrightwood, CA 92397, USA

Abstract. LIDAR technology has been rapidly advancing over the past several decades. It can be used to measure a variety of atmospheric constituents at very high temporal and spatial resolutions. While the number of LIDARs continues to increase worldwide, there is generally a dependency on an operator, particularly for high-powered LIDAR systems. Environment and Climate Change Canada (ECCC) has recently developed a fully autonomous, mobile LIDAR system called AMOLITE (Autonomous Mobile Ozone LIDAR Instrument for Tropospheric Experiments) to simultaneously measure the vertical profile of tropospheric ozone, aerosol and water vapor (night time only) from near ground to altitudes reaching ten to fifteen kilometers. This current system uses a dual laser, dual LIDAR design housed in a single climate-controlled trailer. Ozone profiles are measured by the DIfferential Absorption LIDAR (DIAL) technique using a single 1m Raman cell filled with CO2. The DIAL wavelengths of 287nm and 299nm are generated as the second and third Stokes lines resulting from stimulated Raman scattering of the cell pumped using the fourth harmonic of a Nd:YAG laser (266nm). The aerosol LIDAR transmits three wavelengths simultaneously (355nm, 532nm and 1064nm) employing a detector designed to measure the three backscatter channels, two nitrogen Raman channels (387nm and 607nm), and one cross-polarization channel at 355nm. In addition, we have added a water vapor channel arising from the Raman-shifted 355nm output (407nm) to provide nighttime water vapor profiles. AMOLITE participated in a validation experiment alongside four other ozone DIAL systems before being deployed to the ECCC Oski-ôtin ground site in the Alberta Oil Sands region in November 2016. Ozone was found to increase throughout the troposphere by as much as a factor of 2 from stratospheric intrusions. A biomass burning event that impacted the region over an eight-day period produced LIDAR ratios of 35 to 65sr at 355nm and 40 to 100sr at 532. Over the same period the Angstrom exponent decreased from 1.56±0.2 to 1.35±0.2 between the 2 to 4km smoke region. The advantage of nearly continuous measurements obtained over a 12-month period will be presented, highlighting the synergistic advantage of AMOLITE’s tri-LIDAR design.

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Environment and Climate Change Canada has recently developed a fully autonomous, mobile LIDAR system to simultaneously measure the vertical profile of tropospheric ozone, aerosol and water vapor from near ground to altitudes reaching ten to fifteen kilometers. These atmospheric constituents play an important role in climate, air quality, human and ecosystem health. Using an autonomous multi-LIDAR approach provides a continuous data set rich in information for atmospheric process studies.
Environment and Climate Change Canada has recently developed a fully autonomous, mobile LIDAR...
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