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  Cleaner skies during the COVID-19 lockdown

Voigt, C., Lelieveld, J., Schlager, H., Schneider, J., Curtius, J., Meerkötter, R., et al. (2022). Cleaner skies during the COVID-19 lockdown. Bulletin of the American Meteorological Society, 103. doi:10.1175/BAMS-D-21-0012.1.

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 Creators:
Voigt, Christiane, Author
Lelieveld, Jos1, Author           
Schlager, Hans, Author
Schneider, Johannes2, Author           
Curtius, Joachim, Author
Meerkötter, Ralf, Author
Sauer, Daniel, Author
Bugliaro, Luca, Author
Bohn, Birger, Author
Crowley, John N.1, Author           
Erbertseder, Thilo, Author
Groβ, Silke, Author
Hahn, Valerian, Author
Li, Qiang, Author
Mertens, Mariano, Author
Pöhlker, Mira L.3, Author           
Pozzer, Andrea1, Author           
Schumann, Ulrich, Author
Tomsche, Laura, Author
Williams, Jonathan1, Author           
Zahn, Andreas, AuthorAndreae, Meinrat3, Author           Borrmann, Stephan2, Author           Bräuer, Tiziana, AuthorDörich, Raphael1, Author           Dörnbrack, Andreas, AuthorEdtbauer, Achim1, Author           Ernle, Lisa1, Author           Fischer, Horst1, Author           Giez, Andreas, AuthorGranzin, Manuel, AuthorGrewe, Volker, AuthorHarder, Hartwig1, Author           Heinritzi, Martin, AuthorHolanda, Bruna A.3, Author           Jöckel, Patrick, AuthorKaiser, Katharina, AuthorKrüger, Ovid O.3, Author           Lucke, Johannes, AuthorMarsing, Andreas, AuthorMartin, Anna1, Author           Matthes, Sigrun, AuthorPöhlker, Christopher3, Author           Pöschl, Ulrich3, Author           Reifenberg, Simon1, Author           Ringsdorf, Akima1, Author           Scheibe, Monika, AuthorTadic, Ivan1, Author           Zauner-Wieczorek, Marcel, AuthorHenke, Rolf, AuthorRapp, Markus, Author more..
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              
3Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: During spring 2020, the COVID-19 pandemic caused massive reductions in emissions from industry, ground and airborne transportation. To explore the resulting atmospheric composition changes, we conducted the BLUESKY campaign with two research aircraft and measured trace gases, aerosols, and cloud properties from the boundary layer to the lower stratosphere. From 16 May to 9 June 2020, we performed 20 flights in the early COVID-19 lockdown phase over Europe and the Atlantic Ocean. We found up to 50% reductions in boundary layer nitrogen dioxide concentrations in urban areas from GOME-2B satellite data, along with carbon monoxide reductions in the pollution hot spots. We measured 20 to 70% reductions in total reactive nitrogen, carbon monoxide and fine mode aerosol concentration in profiles over German cities compared to a 10-year data set from passenger aircraft. The total aerosol mass was significantly reduced below 5 km altitude, and the organic aerosol fraction also aloft, indicative of decreased organic precursor gas emissions. The reduced aerosol optical thickness caused a perceptible shift in sky color towards the blue part of the spectrum (hence BLUESKY) and increased shortwave radiation at the surface. We find that the 80% decline in air traffic led to substantial reductions in nitrogen oxides at cruise altitudes, in contrail cover, and in resulting radiative forcing. The light extinction and depolarization by cirrus were also reduced in regions with substantially decreased air traffic. General circulation-chemistry model simulations indicate good agreement with the measurements when applying a reduced emission scenario. The comprehensive BLUESKY dataset documents the major impact of anthropogenic emissions on the atmospheric composition.

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Language(s): eng - English
 Dates: 2022-03-30
 Publication Status: Published online
 Pages: 57
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1175/BAMS-D-21-0012.1
 Degree: -

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Title: Bulletin of the American Meteorological Society
Source Genre: Journal
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Publ. Info: American Meteorological Society
Pages: - Volume / Issue: 103 Sequence Number: - Start / End Page: - Identifier: ISSN: 0003-0007
CoNE: https://pure.mpg.de/cone/journals/resource/954925377920