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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Aug 2018

Research article | 20 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Validation of the TOLNet Lidars: The Southern California Ozone Observation Project (SCOOP)

Thierry Leblanc1, Mark A. Brewer1, Patrick S. Wang1, Maria Jose Granados-Munoz1,2, Kevin B. Strawbridge3, Michael Travis3, Bernard Firanski3, John T. Sullivan4, Thomas J. McGee4, Grant K. Sumnicht5, Laurence W. Twigg5, Timothy A. Berkoff6, William Carrion6, Guillaume Gronoff6,7, Ali Aknan6, Gao Chen6, Raul J. Alvarez8, Andrew O. Langford8, Christoph J. Senff9, Guillaume Kirgis9, Matthew S. Johnson10, Shi Kuang11, and Michael J. Newchurch11 Thierry Leblanc et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Wrightwood, CA 92397, USA
  • 2Remote Sensing Laboratory/CommSensLab, Universitat Politècnica de Catalunya, Barcelona, Spain
  • 3Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, ON, Canada
  • 4NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 5Science Systems and Applications Inc., Lanham, MD, USA
  • 6NASA Langley Research Center, Hampton, VA, USA
  • 7Science Systems and Appli cations Inc, Hampton, VA, USA
  • 8NOAA Earth System Research Laboratory (ESRL) Chemical Sciences Division, Boulder, CO, USA
  • 9University of Colorado Cooperative Institute for Research in Environmental Sciences (CIRES) at the NOAA Earth System Research Labora tory (ESRL) Chemical Sciences Division , Boulder, CO, USA
  • 10NASA Ames Research Center, Moffett Field, CA, USA
  • 11University of Alabama in Huntsville, AL, USA

Abstract. The North-America-based Tropospheric Ozone Lidar Network (TOLNet) was recently established to provide high spatio-temporal vertical profiles of ozone, to better understand physical processes driving tropospheric ozone variability, and to validate the tropospheric ozone measurements of upcoming space-borne missions such as Tropospheric Emissions: Monitoring Pollution (TEMPO). The network currently comprises six tropospheric ozone lidars, four of which are mobile instruments deploying to the field a few times per year, based on campaign and science needs. In August 2016, all four mobile TOLNet lidars were brought to the fixed TOLNet site of JPL-Table Mountain Facility for the one-week-long Southern California Ozone Observation Project (SCOOP). This inter-comparison campaign, which included 400 hours of lidar measurements and 18 ozonesondes launches, allowed for the unprecedented simultaneous validation of five of the six TOLNet lidars. For measurements between 3 and 10km above sea level, a mean difference of 0.7ppbv (1.7%), with a root-mean-square deviation of 1.6ppbv or 2.4% was found between the lidars and ozonesondes, which is well within the combined uncertainties of the two measurement techniques. The few minor differences identified were typically associated with the known limitations of the lidars at the profiles altitude extremes (i.e., first 1km above ground and at the instruments highest retrievable altitude). As part of a large homogenization and quality control effort within the network, many aspects of the TOLNet in-house data processing algorithms were also standardized and validated. This thorough validation of both the measurements and retrievals builds confidence in the high quality and reliability of the TOLNet ozone lidar profiles for many years to come, making TOLNet a valuable ground-based reference network for tropospheric ozone profiling.

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Thierry Leblanc et al.
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Publications Copernicus
Short summary
This article reviews the capability of five ozone lidars from the North-American TOLNet lidar network. These ground-based laser remote sensing instruments typically measure ozone in the troposphere with a precision of 5 %, and vertical and time resolutions of 100-m and 10-min respectively. Understanding ozone variability at high spatio-temporal scales is essential for monitoring air quality, human health and climate. This article shows that the TOLNet lidars are very well suited for this purpose.
This article reviews the capability of five ozone lidars from the North-American TOLNet lidar...