AI Article Synopsis
- The study compares aerosol samples collected from the IAGOS-CARIBIC aircraft with aerosol backscattering data from the CALIOP lidar on the CALIPSO satellite to understand aerosol composition in the lowermost stratosphere.
- Concentrations of key stratospheric aerosol components, mainly sulphur and carbon, were analyzed post-flight, complementing existing black carbon data to assess overall aerosol backscattering.
- The findings reveal discrepancies between the two measurement methods, highlighting that the best agreement occurs during volcanic activity or when aerosol levels are elevated, particularly in winter and spring above the tropopause.
Article 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 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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6821816 | PMC |
| http://dx.doi.org/10.1038/s41598-019-52089-6 | DOI Listing |
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