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https://doi.org/10.5194/acp-2020-647
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-647
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Jul 2020

27 Jul 2020

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This preprint is currently under review for the journal ACP.

Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions

Mariana Adam1, Doina Nicolae1, Livio Belegante1, Iwona S. Stachlewska2, Lucja Janicka2, Dominika Szczepanik2, Maria Mylonaki3, Christiana Anna Papanikolaou3, Nikos Siomos4, Kalliopi Artemis Voudouri4, Luca Alados-Arboledas5, Juan Antonio Bravo-Aranda5, Arnoud Apituley6, Nikolaos Papagiannopoulos7, Lucia Mona7, Ina Mattis8, Anatoli Chaikovsky9, Michaël Sicard10,11, Constantino Muñoz-Porcar10, Aleksander Pietruczuk12, Daniele Bortoli13, Holger Baars14, Ivan Grigorov15, and Zahary Peshev15 Mariana Adam et al.
  • 1National Institute for R&D in Optoelectronics, Magurele, 077225, Romania
  • 2Faculty of Physics, University of Warsaw, 02-093, Poland
  • 3National Technical University of Athens, Department of Physics, Athens, 15780, Greece
  • 4Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
  • 5Andalusian Institute for Earth System Research, Department of Applied Physics, University of Granada, Granada, 18071, Spain
  • 6KNMI – Royal Netherlands Meteorological Institute, De Bilt, 3731, the Netherlands
  • 7Consiglio Nazionale delle Ricerche – Istituto di Metodologie per l'Analisi Ambientale (CNR-IMAA), C.da S.Loja. Tito Scalo (PZ), Italy
  • 8Deutscher Wetterdienst, Meteorologisches Observatorium Hohenpeißenberg, Hohenpeißenberg, 82383 Germany
  • 9Institute of Physics, NAS of Belarus, Minsk, 220072, Belarus
  • 10Remote Sensing Laboratory/CommSensLab, Universitat Politecnica de Catalunya, Barcelona, 08034, Spain
  • 11Ciencies i Tecnologies de l'Espai – Centre de Recerca de l'Aeronautica i de l'Espai/Institut d'Estudis Espacials de Catalunya (CTE-CRAE/IEEC), Universitat Politecnica de Catalunya, Barcelona, 08034, Spain
  • 12Institute of Geophysics, Polish Academy of Sciences, Warsaw, 01-452, Poland
  • 13Earth Sciences Institute, Physics Department, University of Évora, Évora, 7000, Portugal
  • 14Leibniz Institute for Tropospheric Research, Leipzig, 04318, Germany
  • 15Institute of Electronics, Bulgarian Academy of Sciences, 1784, Sofia

Abstract. Biomass burning events are analysed using the European Aerosol Research Lidar Network database for atmospheric profiling of aerosols by lidars. Atmospheric profiles containing forest fires layers were identified in data collected by fourteen stations during 2008–2017. The data ranged from complete data sets (particle backscatter coefficient, extinction coefficient and linear depolarization ratio) to single profiles (particle backscatter coefficient). The data analysis methodology was described in Part I (Biomass burning events measured by lidars in EARLINET. Part I. Data analysis methodology, under discussions to ACP, the EARLINET special issue). The results are analysed by means of intensive parameters in three directions: (I) common biomass burning source (fire) recorded by at least two stations, (II) long range transport of smoke particles from North America (here, we divided the events into pure North America and mixed-North America and local) smoke groups, and (III) analysis of smoke particles over four geographical regions (SE Europe, NE Europe, Central Europe and SW Europe). Five events were found for case (I), while 24 events were determined for case (II). A statistical analysis over the four geographical regions considered revealed that smoke originated from different regions. The smoke detected in the Central Europe region (Cabauw, Leipzig, and Hohenpeißenberg) was mostly brought over from North America (87 % of the fires), by long range transport. The smoke in the South West region (Barcelona, Evora, and Granada) came mostly from the Iberian Peninsula and North Africa, the long-range transport from North America accounting for only 9 % here. The smoke in the North Europe region (Belsk, Minsk, and Warsaw) originated mostly in East Europe (Ukraine and Russia), and had a 31 % contribution from smoke by long-range transport from North America. For the South East region (Athens, Bucharest, Potenza, Sofia, Thessaloniki) the origin of the smoke was mostly located in SE Europe (only 3 % from North America). Specific features for the lidar-derived intensive parameters based on smoke continental origin were determined for each region. Based on the whole dataset, the following signatures were observed: (i) the colour ratio of the lidar ratio and the backscatter Ångström exponent increase with travel time, while the extinction Ångström exponent and the colour ratio of the particle depolarization ratio decrease; (ii) an increase of the colour ratio of the particle depolarization ratio corresponds to both a decrease of the colour ratio of the lidar ratios and an increase of the extinction Ångström exponent; (iii) the measured smoke originating from all continental regions is characterized in average as aged smoke, except for a few cases; (iv) in general, the local smoke shows a smaller lidar ratio while the long range transported smoke shows a higher lidar ratio; and (v) the depolarization is smaller for long range transported smoke. A complete characterization of the smoke particles type (either fresh or aged) is presented for each of the four geographical regions versus different continental source regions.

Mariana Adam et al.

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Short summary
Results over 10 years of biomass burning events measured by EARLINET are analysed by means of the intensive parameters based on the methodology described in Part I. Smoke type is characterized for each of the four geographical regions based on continental smoke origin. Relationships between intensive parameters or colour ratios are shown. The smoke is labelled in average as aged smoke. The local smoke has a smaller lidar ratio while the depolarization is smaller for long range transported smoke.
Results over 10 years of biomass burning events measured by EARLINET are analysed by means of...
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