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Intercomparison of in-situ aircraft and satellite aerosol measurements in the stratosphere

Sandvik, Oscar S. LU ; Friberg, Johan LU ; Martinsson, Bengt G. LU ; van Velthoven, Peter F.J. ; Hermann, Markus and Zahn, Andreas (2019) In Scientific Reports 9.
Abstract

Aerosol composition and optical scattering from particles in the lowermost stratosphere (LMS) have been studied by comparing in-situ aerosol samples from the IAGOS-CARIBIC passenger aircraft with vertical profiles of aerosol backscattering obtained from the CALIOP lidar aboard the CALIPSO satellite. Concentrations of the dominating fractions of the stratospheric aerosol, being sulphur and carbon, have been obtained from post-flight analysis of IAGOS-CARIBIC aerosol samples. This information together with literature data on black carbon concentrations were used to calculate the aerosol backscattering which subsequently is compared with measurements by CALIOP. Vertical optical profiles were taken in an altitude range of several kilometres... (More)

Aerosol composition and optical scattering from particles in the lowermost stratosphere (LMS) have been studied by comparing in-situ aerosol samples from the IAGOS-CARIBIC passenger aircraft with vertical profiles of aerosol backscattering obtained from the CALIOP lidar aboard the CALIPSO satellite. Concentrations of the dominating fractions of the stratospheric aerosol, being sulphur and carbon, have been obtained from post-flight analysis of IAGOS-CARIBIC aerosol samples. This information together with literature data on black carbon concentrations were used to calculate the aerosol backscattering which subsequently is compared with measurements by CALIOP. Vertical optical profiles were taken in an altitude range of several kilometres from and above the northern hemispheric extratropical tropopause for the years 2006-2014. We find that the two vastly different measurement platforms yield different aerosol backscattering, especially close to the tropopause where the influence from tropospheric aerosol is strong. The best agreement is found when the LMS is affected by volcanism, i.e., at elevated aerosol loadings. At background conditions, best agreement is obtained some distance (>2 km) above the tropopause in winter and spring, i.e., at likewise elevated aerosol loadings from subsiding aerosol-rich stratospheric air. This is to our knowledge the first time the CALIPSO lidar measurements have been compared to in-situ long-term aerosol measurements.

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organization
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type
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publication status
published
subject
in
Scientific Reports
volume
9
article number
15576
publisher
Nature Publishing Group
external identifiers
  • pmid:31666595
  • scopus:85074272991
ISSN
2045-2322
DOI
10.1038/s41598-019-52089-6
language
English
LU publication?
yes
id
e084b305-a6ad-4dd3-b480-b5e358fe87f4
date added to LUP
2019-11-13 13:36:20
date last changed
2020-01-13 02:31:34
@article{e084b305-a6ad-4dd3-b480-b5e358fe87f4,
  abstract     = {<p>Aerosol composition and optical scattering from particles in the lowermost stratosphere (LMS) have been studied by comparing in-situ aerosol samples from the IAGOS-CARIBIC passenger aircraft with vertical profiles of aerosol backscattering obtained from the CALIOP lidar aboard the CALIPSO satellite. Concentrations of the dominating fractions of the stratospheric aerosol, being sulphur and carbon, have been obtained from post-flight analysis of IAGOS-CARIBIC aerosol samples. This information together with literature data on black carbon concentrations were used to calculate the aerosol backscattering which subsequently is compared with measurements by CALIOP. Vertical optical profiles were taken in an altitude range of several kilometres from and above the northern hemispheric extratropical tropopause for the years 2006-2014. We find that the two vastly different measurement platforms yield different aerosol backscattering, especially close to the tropopause where the influence from tropospheric aerosol is strong. The best agreement is found when the LMS is affected by volcanism, i.e., at elevated aerosol loadings. At background conditions, best agreement is obtained some distance (&gt;2 km) above the tropopause in winter and spring, i.e., at likewise elevated aerosol loadings from subsiding aerosol-rich stratospheric air. This is to our knowledge the first time the CALIPSO lidar measurements have been compared to in-situ long-term aerosol measurements.</p>},
  author       = {Sandvik, Oscar S. and Friberg, Johan and Martinsson, Bengt G. and van Velthoven, Peter F.J. and Hermann, Markus and Zahn, Andreas},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Intercomparison of in-situ aircraft and satellite aerosol measurements in the stratosphere},
  url          = {http://dx.doi.org/10.1038/s41598-019-52089-6},
  doi          = {10.1038/s41598-019-52089-6},
  volume       = {9},
  year         = {2019},
}