The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET

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dc.contributor.author Baars, H.
dc.contributor.author Ansmann, A.
dc.contributor.author Ohneiser, K.
dc.contributor.author Haarig, M.
dc.contributor.author Engelmann, R.
dc.contributor.author Althausen, D.
dc.contributor.author Hanssen, I.
dc.contributor.author Gausa, M.
dc.contributor.author Pietruczuk, A.
dc.contributor.author Szkop, A.
dc.contributor.author Stachlewska, I. S.
dc.contributor.author Wang, D.
dc.contributor.author Reichhardt, J.
dc.contributor.author Skupin, A.
dc.contributor.author Mattis, I.
dc.contributor.author Trickl, T.
dc.contributor.author Vogelmann, H.
dc.contributor.author Navas-Guzmán, F.
dc.contributor.author Haefele, A.
dc.contributor.author Acheson, K.
dc.contributor.author Ruth, Albert A.
dc.contributor.author Tatarov, B.
dc.contributor.author Muller, D.
dc.contributor.author Hu, Q.
dc.contributor.author Podvin, T.
dc.contributor.author Goloub, P.
dc.contributor.author Vesselovski, I.
dc.contributor.author Pietras, C.
dc.contributor.author Haeffelin, M.
dc.contributor.author Freville, P.
dc.contributor.author Sicard, M.
dc.contributor.author Comerón, A.
dc.contributor.author Fernández García, A. J.
dc.contributor.author Molero Menéndez, F.
dc.contributor.author Córdoba-Jaboner, C.
dc.contributor.author Guerrero-Rascado, J. L.
dc.contributor.author Alados-Arboledas, L.
dc.contributor.author Bortoli, D.
dc.contributor.author Costa, M. J.
dc.contributor.author Dionisi, D.
dc.contributor.author Liberti, G. L.
dc.contributor.author Wang, X.
dc.contributor.author Sannino, A.
dc.contributor.author Papagiannopoulos, N.
dc.contributor.author Boselli, A.
dc.contributor.author Mona, L.
dc.contributor.author D'Amico, G.
dc.contributor.author Romano, S.
dc.contributor.author Perrone, M. R.
dc.contributor.author Belegante, L.
dc.contributor.author Nicolae, D.
dc.contributor.author Grigorov, I.
dc.contributor.author Gialitaki, A.
dc.contributor.author Amiridis, V.
dc.contributor.author Soupiona, O.
dc.contributor.author Papayannis, A.
dc.contributor.author Mamouri, R. E.
dc.contributor.author Nisantzi, A.
dc.contributor.author Heese, B.
dc.contributor.author Hofer, J.
dc.contributor.author Schechner, Y. Y.
dc.contributor.author Wandinger, U.
dc.contributor.author Pappalardo, G.
dc.date.accessioned 2019-12-05T16:00:01Z
dc.date.available 2019-12-05T16:00:01Z
dc.date.issued 2019-07-18
dc.identifier.citation Baars, H. et al (2019) 'The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET', Atmos. Chem. Phys., 19(23), pp. 15183-15198. doi: 10.5194/acp-2019-615 en
dc.identifier.volume 2019 en
dc.identifier.volume 19
dc.identifier.startpage 1 en
dc.identifier.startpage 15183
dc.identifier.endpage 27 en
dc.identifier.endpage 15198
dc.identifier.issn 1680-7375
dc.identifier.uri http://hdl.handle.net/10468/9350
dc.identifier.doi 10.5194/acp-2019-615 en
dc.description.abstract Six months of stratospheric aerosol observations with the European Aerosol Research Lidar Network (EARLINET) from August 2017 to January 2018 are presented. The decay phase of an unprecedented, record-breaking stratospheric perturbation caused by wild fire smoke is reported and discussed in terms of geometrical, optical, and microphysical aerosol properties. Enormous amounts of smoke (mainly soot particles) were injected into the upper troposphere and lower stratosphere over fire areas in western Canada on 12 August 2017 during strong thunderstorm-pyrocumulonimbus activity. The stratospheric smoke plumes spread over the entire northern hemisphere in the following weeks and months. Twenty-eight European lidar stations from northern Norway to southern Portugal and the Eastern Mediterranean monitored the strong stratospheric perturbation on a continental scale. The main smoke layer (over central, western, southern, and eastern Europe) was found between 15 and 20 km height since September 2017 (about two weeks after entering the stratosphere). Thin layers of smoke were detected to ascent to 22–24 km height. The stratospheric aerosol optical thickness at 532 nm decreased from values > 0.25 on 21–23 August 2017 to 0.005–0.03 until 5–10 September, and was mainly 0.003–0.004 from October to December 2017, and thus still significantly above the stratospheric background (0.001–0.002). Stratospheric particle extinction coefficients (532 nm) were as high as 50–200 Mm−1 until the beginning of September and of the order of 1 Mm−1 (0.5–5 Mm−1) from October 2017 until the end of January 2018. The corresponding layer mean particle mass concentration was of the order of 0.05–0.5 μg cm−3 over the months. Soot is an efficient ice-nucleating particle (INP) at upper tropospheric (cirrus) temperatures and available to influence cirrus formation when entering the tropopause from above. We estimated INP concentrations of 50–500 L−1 until the first days in September and afterwards 5–50 L−1 until the end of the year 2018 in the lower stratosphere for typical cirrus formation temperatures of −55 °C and ice supersaturation values of 1.15. The measured profiles of the particle linear depolarization rato indicated the predominance of non-spherical soot particles. The 532 nm depolarization ratio decreased with time in the main smoke layer from values of 0.15–0.25 (August–September) to values of 0.05–0.10 (October–November) and < 0.05 (December–January). The decrease of the depolarization ratio is consistent with the steady removal of the larger smoke particles by gravitational settling and changes in the particle shape with time towards a spherical form. An ascending layer with a vertical depth of 500–1000 m was detected (over the Eastern Mediterranean at 32–35° N) that ascended from about 18–19 km to 22–23 km height from the beginning of October to the beginning of December 2017 (about 2 km per month) and may be related to the increasing build up of the winter-hemispheric Brewer–Dobson circulation system. en
dc.description.sponsorship Bundesministerium für Bildung und Forschung (HD(CP)2 under grant agreement no. 01LK1502I by the German Ministry for Education and Research (BMBF)); Spanish Agencia Estatal de Investigación (MDM-2016-0600); Ministerio de Economía, Industria y Competitividad, Gobierno de España (ref. TEC2015-63832-P, CGL2017-90884-REDT and MDM-2016-0600); German-Israeli Foundation for Scientific Research and Development (GIF grant I-1262 401.10/2014); Russian Science Foundation (project 16-17-10241) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher European Geosciences Union (EGU) en
dc.relation.uri https://www.atmos-chem-phys-discuss.net/acp-2019-615/
dc.rights © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. en
dc.rights.uri https://creativecommons.org/licenses/by/4.0/ en
dc.subject Stratospheric aerosol observations en
dc.subject European Aerosol Research Lidar Network (EARLINET) en
dc.subject Wild fire smoke en
dc.subject INP concentrations en
dc.subject Smoke layer en
dc.subject Brewer-Dobson circulation system en
dc.title The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Albert Ruth, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: a.ruth@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2019-12-05T15:38:24Z
dc.description.version Published Version en
dc.internal.rssid 500168559
dc.contributor.funder Seventh Framework Programme en
dc.contributor.funder Horizon 2020 en
dc.contributor.funder Bundesministerium für Bildung und Forschung en
dc.contributor.funder Agencia Estatal de Investigación en
dc.contributor.funder Ministerio de Economía, Industria y Competitividad, Gobierno de España en
dc.contributor.funder Irish Research Council en
dc.contributor.funder German-Israeli Foundation for Scientific Research and Development en
dc.contributor.funder Russian Science Foundation en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Atmospheric Chemistry and Physics en
dc.internal.copyrightchecked Yes
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress a.ruth@ucc.ie en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP4::INFRA/262254/EU/Aerosols, Clouds, and Trace gases Research Infrastructure Network/ACTRIS en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP1::ENV/603445/EU/Impact of Biogenic versus Anthropogenic emissions on Clouds and Climate: towards a Holistic UnderStanding/BACCHUS en
dc.relation.project info:eu-repo/grantAgreement/EC/H2020::RIA/654109/EU/Aerosols, Clouds, and Trace gases Research InfraStructure/ACTRIS-2 en
dc.relation.project info:eu-repo/grantAgreement/EC/H2020::CSA/763643/EU/ERATOSTHENES: Excellence Research Centre for Earth Surveillance and Space-Based Monitoring of the Environment/EXCELSIOR en
dc.relation.project info:eu-repo/grantAgreement/EC/H2020::MSCA-RISE/778349/EU/Development of GRASP radiative transfer code for the retrieval of aerosol microphysics vertical-profiles from space measurements and its impact in ACE mission/GRASP-ACE en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Frontiers Programme (RFP)/06/RFP/EEB011/IE/The vertical aerosol distribution over Southern Ireland studied by backscatter and Raman LIDAR/ en
dc.identifier.eissn 1680-7324


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© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. Except where otherwise noted, this item's license is described as © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union.
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