Publikation:
Long-term trends of black carbon and particle number concentration in the lower free troposphere in Central Europe

Kurzanzeige
dc.contributor.authorSun, Jia
dc.contributor.authorBirmili, Wolfram
dc.contributor.authorHermann, Markus
dc.contributor.authorYuan, Ye
dc.date.accessioned2024-06-16T13:37:50Z
dc.date.available2024-06-16T13:37:50Z
dc.date.issued2021
dc.description.abstractBackground The implementation of emission mitigation policies in Europe over the last two decades has generally improved the air quality, which resulted in lower aerosol particle mass, particle number, and black carbon mass concentration. However, little is known whether the decreasing particle concentrations at a lower-altitude level can be observed in the free troposphere (FT), an important layer of the atmosphere, where aerosol particles have a longer lifetime and may affect climate dynamics. In this study, we used data from two high-Alpine observatories, Zugspitze-Schneefernerhaus (ZSF) and Jungfraujoch (JFJ), to assess the long-term trends on size-resolved particle number concentrations (PNCs) and equivalent black carbon (eBC) mass concentration separated for undisturbed lower FT conditions and under the influence of air from the planetary boundary layer (PBL) from 2009 to 2018. Results The FT and PBL-influenced conditions were segregated for both sites. We found that the FT conditions in cold months were more prevalent than in warm months, while the measured aerosol parameters showed different seasonal patterns for the FT and PBL-influenced conditions. The pollutants in the PBL-influenced condition have a higher chance to be transported to high-altitudes due to the mountainous topography, leading to a higher concentration and more distinct seasonal variation, and vice versa. The long-term trends of the measured aerosol parameters were evaluated and the decreased aerosol concentrations were observed for both FT and PBL-influenced conditions. The observed decreasing trends in eBC concentration in the PBL-influenced condition are well consistent with the reported trends in total BC emission in Germany and Switzerland. The decreased concentrations in the FT condition suggest that the background aerosol concentration in the lower FT over Central Europe has correspondingly decreased. The change of back trajectories in the FT condition at ZSF and JFJ was further evaluated to investigate the other possible drivers for the decreasing trends. Conclusions The background aerosol concentration in the lower FT over Central Europe has significantly decreased during 2009-2018. The implementation of emission mitigation policies is the most decisive factor and the decrease of the regional airmass occurrence over Central Europe also has contributed to the decreasing trends. © 2021, The Author(s)en
dc.format.extent1 Onlineresource (16 pages)
dc.format.mediumonline resource
dc.identifier.doihttps://doi.org/10.60810/openumwelt-75
dc.identifier.urihttps://openumwelt.de/handle/123456789/3421
dc.language.isoeng
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectBlack Carbon
dc.subjectAnzahlkonzentration
dc.titleLong-term trends of black carbon and particle number concentration in the lower free troposphere in Central Europe
dc.title.alternativeLong-term trends of black carbon and particle number concentration in the lower free troposphere in Central Europe
dc.typeWissenschaftlicher Artikel
dc.type.dcmitext
dc.type.mediumcomputer
dspace.entity.typePublication
local.bibliographicCitation.journalTitleEnvironmental Sciences Europe
local.bibliographicCitation.originalDOI10.1186/s12302-021-00488-w
local.bibliographicCitation.volume33 (2021)
local.collectionAufsätze
local.contributor.authorId02171963
local.contributor.authorId02181734
local.contributor.authorId02181746
local.identifier.catalogId02484789
local.ingest.leader06323naa a2200000uu 4500
local.jointTitleLONGTERM TRENDS OF BLACK CARBON AND PARTICLE NUMBER CONCENTRATION IN THE LOWER FREE TROPOSPHERE IN CENTRAL EUROPE
local.reviewtrue
local.sourcecatalog
local.staffPublicationtrue
relation.isAuthorOfPublication530a7f84-0626-465c-8eb4-c1bb5e4b1ca6
relation.isAuthorOfPublication.latestForDiscovery530a7f84-0626-465c-8eb4-c1bb5e4b1ca6
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