Biomass burning events measured by lidars in EARLINET – Part 2: Optical properties investigation
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Le résumé fourni par la source
Abstract. Biomass burning episodes measured at 14 stations of the European Aerosol Research Lidar Network (EARLINET) over 2008–2017 were analysed using the methodology described in "Biomass burning events measured by lidars in EARLINET – Part 1: Data analysis methodology" (Adam et al., 2020, this issue). The smoke layers were identified in lidar optical properties profiles. A number of 795 layers for which we measured at least one intensive parameter was analysed. These layers were geographically distributed as follows: 399 layers observed in South-East Europe, 119 layers observed in South-West Europe, 243 layers observed in North-East Europe, and 34 layers observed in Central Europe. The mean layer intensive parameters are discussed following two research directions: (I) the long-range transport of smoke particles from North America, and (II) the smoke properties (fresh versus aged), separating the smoke events into four continental source regions (European, North American, African, Asian or a mixture of two), based on back trajectory analysis. The smoke detected in Central Europe (Cabauw, Leipzig, and Hohenpeißenberg) was mostly transported from North America (87 % of fires). In North-East Europe (Belsk, Minsk, Warsaw) smoke advected mostly from Eastern Europe (Ukraine and Russia), but there was a significant contribution (31 %) from North America. In South-West Europe (Barcelona, Evora, Granada) smoke originated mainly from the Iberian Peninsula and North Africa (while 9 % were originating in North America). In the South-East Europe (Athens, Bucharest, Potenza, Sofia, Thessaloniki) the origin of the smoke was mostly local (only 3 % represented North America smoke). The following features, correlated with the increased smoke travel time (corresponding to aging) were found: the colour ratio of the lidar ratio (i.e., the ratio of the lidar ratio at 532 nm to the lidar ratio at 355 nm) and the colour ratio of the backscatter Ångström exponent (i.e., the ratio of the backscatter-related Angstrom exponent for the pair 532 nm – 1064 nm to the one for the pair 355 nm – 532 nm) increase, while the extinction Ångström exponent and the colour ratio of the particle depolarization ratio (i.e., the ratio of the particle linear depolarization ratio at 532 nm to the particle depolarization ratio at 355 nm) decrease. The smoke originating from all continental regions can be characterized on average as aged smoke, with a very few exceptions. In general, the long range transported smoke shows higher lidar ratio and lower depolarization ratio compared to the local smoke.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Biomass burning events measured by lidars in EARLINET – Part 2: Optical properties investigation
- Date Crossref
- 18/10/2021
- Éditeur
- Copernicus GmbH
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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National Institute of Research and Development for Optoelectronics pays non établi dans la noticeInstitution
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University of Warsaw pays non établi dans la noticeUniversité ou école supérieure
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National Research Council - Institute of Methodologies for Environmental Analysis pays non établi dans la noticeStructure de recherche
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Universidad de Granada pays non établi dans la noticeUniversité ou école supérieure
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Instituto Andaluz de Ciencias de la Tierra pays non établi dans la noticeStructure de recherche
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Institut d'Estudis Espacials de Catalunya pays non établi dans la noticeStructure de recherche
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Universitat Politècnica de Catalunya pays non établi dans la noticeUniversité ou école supérieure
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National Technical University of Athens pays non établi dans la noticeUniversité ou école supérieure
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Aristotle University of Thessaloniki Laboratory of Atmospheric Physics pays non établi dans la noticeUniversité ou école supérieure
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National Observatory of Athens pays non établi dans la noticeStructure de recherche
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Institute for Astronomy pays non établi dans la noticeStructure de recherche
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Royal Netherlands Meteorological Institute pays non établi dans la noticeOrganisme public
National Institute of Research and Development for Optoelectronics, University of Warsaw et National Research Council - Institute of Methodologies for Environmental Analysis, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.