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Title: The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET
Authors: Baars, Holger
Ansmann, Albert
Ohneiser, Kevin
Haarig, Moritz
Engelmann, Ronny
Althausen, Dietrich
Hanssen, Ingrid
Gausa, Michael
Pietruczuk, Aleksander
Szkop, Artur
Stachlewska, Iwona S.
Wang, Dongxiang
Reichardt, Jens
Skupin, Annett
Mattis, Ina
Trickl, Thomas
Vogelmann, Hannes
Navas-Guzmán, Francisco
Haefele, Alexander
Acheson, Karen
Ruth, Albert A.
Tatarov, Boyan
Müller, Detlef
Hu, Qiaoyun
Podvin, Thierry
Goloub, Philippe
Veselovskii, Igor
Pietras, Christophe
Haeffelin, Martial
Fréville, Patrick
Sicard, Michaël
Comerón, Adolfo
Fernández García, Alfonso Javier
Menéndez, Francisco Molero
Córdoba-Jabonero, Carmen
Guerrero-Rascado, Juan Luis
Alados-Arboledas, Lucas
Bortoli, Daniele
Costa, Maria João
Dionisi, Davide
Liberti, Gian Luigi
Wang, Xuan
Sannino, Alessia
Papagiannopoulos, Nikolaos
Boselli, Antonella
Mona, Lucia
D’Amico, Giuseppe
Romano, Salvatore
Perrone, Maria Rita
Belegante, Livio
Nicolae, Doina
Grigorov, Ivan
Gialitaki, Anna
Amiridis, Vassilis
Soupiona, Ourania
Papayannis, Alexandros
Mamouri, Rodanthi-Elisaveth
Nisantzi, Argyro
Heese, Birgit
Hofer, Julian
Schechner, Yoav Y.
Wandinger, Ulla
Pappalardo, Gelsomina
Keywords: Lidar
Remote Sensing
Issue Date: Dec-2019
Publisher: European Geophysical Union -EGU
Citation: Baars, H., Ansmann, A., Ohneiser, K., Haarig, M., Engelmann, R., Althausen, D., Hanssen, I., Gausa, M., Pietruczuk, A., Szkop, A., Stachlewska, I. S., Wang, D., Reichardt, J., Skupin, A., Mattis, I., Trickl, T., Vogelmann, H., Navas-Guzmán, F., Haefele, A., Acheson, K., Ruth, A. A., Tatarov, B., Müller, D., Hu, Q., Podvin, T., Goloub, P., Veselovskii, I., Pietras, C., Haeffelin, M., Fréville, P., Sicard, M., Comerón, A., Fernández García, A. J., Molero Menéndez, F., Córdoba-Jabonero, C., Guerrero-Rascado, J. L., Alados-Arboledas, L., Bortoli, D., Costa, M. J., Dionisi, D., Liberti, G. L., Wang, X., Sannino, A., Papagiannopoulos, N., Boselli, A., Mona, L., D'Amico, G., Romano, S., Perrone, M. R., Belegante, L., Nicolae, D., Grigorov, I., Gialitaki, A., Amiridis, V., Soupiona, O., Papayannis, A., Mamouri, R.-E., Nisantzi, A., Heese, B., Hofer, J., Schechner, Y. Y., Wandinger, U., and Pappalardo, G.: The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET, Atmos. Chem. Phys., 19, 15183–15198,, 2019.
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 wildfire smoke is reported and discussed in terms of geometrical, optical, and microphysical aerosol properties. Enormous amounts of smoke 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 fire 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 at heights between 15 and 20 km since September 2017 (about 2 weeks after entering the stratosphere). Thin layers of smoke were detected at heights of up to 22–23 km. 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 was 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 on 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 on the order of 0.05–0.5 µg m−3 over these months. Soot particles (light-absorbing carbonaceous particles) are efficient ice-nucleating particles (INPs) 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 2017 in the lower stratosphere for typical cirrus formation temperatures of −55 ∘C and an ice supersaturation level of 1.15. The measured profiles of the particle linear depolarization ratio indicated a predominance of nonspherical smoke particles. The 532 nm depolarization ratio decreased slowly 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 aging of the smoke particles, growing of a coating around the solid black carbon core (aggregates), and thus change of the shape towards a spherical form. We found ascending aerosol layer features over the most southern European stations, especially over the eastern Mediterranean at 32–35∘ N, that ascended from heights of about 18–19 to 22–23 km from the beginning of October to the beginning of December 2017 (about 2 km per month). We discuss several transport and lifting mechanisms that may have had an impact on the found aerosol layering structures.
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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