Formation and composition of the UTLS aerosol

Bengt G. Martinsson, Johan Friberg, Oscar S. Sandvik, Markus Hermann, Peter F.J. van Velthoven, Andreas Zahn

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

4 Citeringar (SciVal)

Sammanfattning

Stratospheric aerosol has long been seen as a pure mixture of sulfuric acid and water. Recent measurements, however, found a considerable carbonaceous fraction extending at least 8 km into the stratosphere. This fraction affects the aerosol optical depth (AOD) and the radiative properties, and hence the radiative forcing and climate impact of the stratospheric aerosol. Here we present an investigation based on a decade (2005–2014) of airborne aerosol sampling at 9–12 km altitude in the tropics and the northern hemisphere (NH) aboard the IAGOS-CARIBIC passenger aircraft. We find that the chemical composition of tropospheric aerosol in the tropics differs markedly from that at NH midlatitudes, and, that the carbonaceous stratospheric aerosol is oxygen-poor compared to the tropospheric aerosol. Furthermore, the carbonaceous and sulfurous components of the aerosol in the lowermost stratosphere (LMS) show strong increases in concentration connected with springtime subsidence from overlying stratospheric layers. The LMS concentrations significantly exceed those in the troposphere, thus clearly indicating a stratospheric production of not only the well-established sulfurous aerosol, but also a considerable but less understood carbonaceous component.

Originalspråkengelska
Artikelnummer40
Tidskriftnpj Climate and Atmospheric Science
Volym2
Utgåva1
DOI
StatusPublished - 2019

Ämnesklassifikation (UKÄ)

  • Meteorologi och atmosfärforskning

Fingeravtryck

Utforska forskningsämnen för ”Formation and composition of the UTLS aerosol”. Tillsammans bildar de ett unikt fingeravtryck.

Citera det här