Studying the vertical aerosol extinction coefficient by comparing in situ airborne data and elastic backscatter lidar

dc.contributor.authorRosati, Bernadette
dc.contributor.authorHerrmann, Erik
dc.contributor.authorBucci, Silvia
dc.contributor.authorFierli, Federico
dc.contributor.authorCairo, Francesco
dc.contributor.authorGysel, Martin
dc.contributor.authorTillmann, Ralf
dc.contributor.authorGröß, Johannes
dc.contributor.authorGobbi, Gian Paolo
dc.contributor.authorDi Liberto, Luca
dc.contributor.authorDi Donfrancesco, Guido
dc.contributor.authorWiedensohler, Alfred
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorVirtanen, Annele
dc.contributor.authorMentel, Thomas F.
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-02-08T09:00:04Z
dc.date.available2024-02-08T09:00:04Z
dc.date.issued2016
dc.description.abstractVertical profiles of aerosol particle optical properties were explored in a case study near the San Pietro Capofiume (SPC) ground station during the PEGASOS Po Valley campaign in the summer of 2012. A Zeppelin NT airship was employed to investigate the effect of the dynamics of the planetary boundary layer at altitudes between ∼  50 and 800 m above ground. Determined properties included the aerosol particle size distribution, the hygroscopic growth factor, the effective index of refraction and the light absorption coefficient. The first three parameters were used to retrieve the light scattering coefficient. Simultaneously, direct measurements of both the scattering and absorption coefficient were carried out at the SPC ground station. Additionally, a single wavelength polarization diversity elastic lidar system provided estimates of aerosol extinction coefficients using the Klett method to accomplish the inversion of the signal, for a vertically resolved comparison between in situ and remote-sensing results. Note, however, that the comparison was for the most part done in the altitude range where the overlap function is incomplete and accordingly uncertainties are larger. First, the airborne results at low altitudes were validated with the ground measurements. Agreement within approximately ±25 and ±20 % was found for the dry scattering and absorption coefficient, respectively. The single scattering albedo, ranged between 0.83 and 0.95, indicating the importance of the absorbing particles in the Po Valley region. A clear layering of the atmosphere was observed during the beginning of the flight (until ∼  10:00 LT – local time) before the mixing layer (ML) was fully developed. Highest extinction coefficients were found at low altitudes, in the new ML, while values in the residual layer, which could be probed at the beginning of the flight at elevated altitudes, were lower. At the end of the flight (after ∼  12:00 LT) the ML was fully developed, resulting in constant extinction coefficients at all altitudes measured on the Zeppelin NT. Lidar estimates captured these dynamic features well and good agreement was found for the extinction coefficients compared to the in situ results, using fixed lidar ratios (LR) between 30 and 70 sr for the altitudes probed with the Zeppelin. These LR are consistent with values for continental aerosol particles that can be expected in this region.
dc.identifier.doi10.5194/acp-16-4539-2016
dc.identifier.issn1680-7324
dc.identifier.issn1680-7316
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/44240
dc.identifier.urihttps://doi.org/10.26041/fhnw-8060
dc.issue7
dc.language.isoen
dc.publisherCopernicus
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.spatialGöttingen
dc.subject.ddc620 - Ingenieurwissenschaften und Maschinenbau
dc.titleStudying the vertical aerosol extinction coefficient by comparing in situ airborne data and elastic backscatter lidar
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume16
dspace.entity.typePublication
fhnw.InventedHereYes
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Technikde_CH
fhnw.affiliation.institutlnstitut für Sensorik und Elektronikde_CH
fhnw.openAccessCategoryGold
fhnw.pagination4539–4554
fhnw.publicationStatePublished
relation.isAuthorOfPublication54997bb8-cf4a-4120-b0c7-f8e731e8eea1
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery54997bb8-cf4a-4120-b0c7-f8e731e8eea1
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