Preprints
https://doi.org/10.5194/amt-2022-306
https://doi.org/10.5194/amt-2022-306
 
18 Nov 2022
18 Nov 2022
Status: this preprint is currently under review for the journal AMT.

DeLiAn – a growing collection of depolarization ratio, lidar ratio and Ångström exponent for different aerosol types and mixtures from ground-based lidar observations

Athena Augusta Floutsi1, Holger Baars1, Ronny Engelmann1, Dietrich Althausen1, Albert Ansmann1, Stephanie Bohlmann1,a, Birgit Heese1, Julian Hofer1, Thomas Kanitz1,b, Moritz Haarig1, Kevin Ohneiser1, Martin Radenz1, Patric Seifert1, Annett Skupin1, Zhenping Yin1,2, Sabur F. Abdullaev3, Mika Komppula4, Maria Filioglou4, Elina Giannakaki4,5, Iwona S. Stachlewska6, Lucja Janicka6, Daniele Bortoli7, Eleni Marinou8, Vassilis Amiridis8, Anna Gialitaki8,9,c, Rodanthi-Elisavet Mamouri10,11, Boris Barja12, and Ulla Wandinger1 Athena Augusta Floutsi et al.
  • 1Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany
  • 2School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China
  • 3Physical Technical Institute of the National Academy of Sciences of Tajikistan, Dushanbe, Tajikistan
  • 4Finnish Meteorological Institute, Kuopio, Finland
  • 5Department of Environmental Physics and Meteorology, University of Athens, Athens, Greece
  • 6Faculty of Physics, University of Warsaw, Warsaw, Poland
  • 7Évora University, Institute for Earth Sciences, Évora, Portugal
  • 8IAASARS, National Observatory of Athens, Athens, Greece
  • 9Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, Thessaloniki, Greece
  • 10ERATOSTHENES Centre of Excellence, Limassol, Cyprus
  • 11Cyprus University of Technology, Department of Civil Engineering and Geomatics, Cyprus
  • 12Atmospheric Research Laboratory, University of Magallanes, Punta Arenas, Chile
  • anow at: Finnish Meteorological Institute, Helsinki, Finland
  • bnow at: European Space Agency, ESTEC, Noordwijk, the Netherlands
  • cnow at: School of Physics and Astronomy, Earth Observation Science Group, University of Leicester, Leicester, UK

Abstract. This paper presents a collection of lidar-derived aerosol intensive optical properties for several aerosol types, namely the particle linear depolarization ratio, the extinction-to-backscatter ratio (lidar ratio) and the Ångström exponent. The data collection, named DeLiAn, is based on globally distributed, long-term, ground-based, multiwavelength, Raman and polarisation lidar measurements, conducted mainly with lidars that have been developed at the Leibniz Institute for Tropospheric Research. The intensive optical properties are presented at two wavelengths, 355 and 532 nm, for 13 aerosol categories. The categories cover the basic aerosol types (i.e., marine, pollution, continental European background, volcanic ash, smoke, mineral dust) as well as the most frequently observed mixtures they form. This extensive collection also incorporates more peculiar aerosol categories, including dried marine aerosol that, compared to marine aerosol, exhibits a significantly enhanced depolarization ratio (up to 15 %). Besides Saharan dust, additional mineral dust types related to their source region were identified due to their lower lidar ratios (Central Asian and Middle Eastern dust). In addition, extreme wildfire events (such as in north America and Australia) emitted smoke into the stratosphere showing significant different optical properties, i.e., high depolarization values (up to 25 %), compared to tropospheric smoke. The data collection reflects and underlines the variety of aerosol mixtures in the atmosphere and can be used for the development of aerosol typing schemes. The paper contains the currently most comprehensive overview of optical properties from aerosol lidar measurements and, therefore, provides a solid basis for future aerosol retrievals in the frame of both spaceborne and ground-based lidars. Furthermore, DeLiAn can assist the efforts for harmonization of satellite records of aerosol properties performed at different wavelengths.

Athena Augusta Floutsi et al.

Status: open (until 24 Dec 2022)

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Athena Augusta Floutsi et al.

Athena Augusta Floutsi et al.

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Short summary
DeLiAn is a collection of lidar-derived aerosol intensive optical properties for several aerosol types, namely the particle linear depolarization ratio, the extinction-to-backscatter ratio (lidar ratio), and the Ångström exponent. The data collection is based on globally distributed, long-term, ground-based, multiwavelength, Raman and polarisation lidar measurements and currently covers two wavelengths, 355 and 532 nm, for 13 aerosol categories ranging from basic aerosol types to mixtures.