Preprints
https://doi.org/10.5194/acp-2021-582
https://doi.org/10.5194/acp-2021-582

  27 Jul 2021

27 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

Reduced ice number concentrations in contrails from low aromatic biofuel blends

Tiziana Bräuer1, Christiane Voigt1,2, Daniel Sauer1, Stefan Kaufmann1, Valerian Hahn1, Monika Scheibe1, Hans Schlager1, Felix Huber1,3, Patrick Le Clercq4, Richard Moore5, and Bruce Anderson5 Tiziana Bräuer et al.
  • 1German Aerospace Center, Oberpfaffenhofen, Germany
  • 2Johannes Gutenberg University Mainz, Mainz, Germany
  • 3University of the Federal Armed Forces in Munich, Munich, Germany
  • 4German Aerospace Center, Stuttgart, Germany
  • 5NASA Langley Research Center, Hampton, Virginia, USA

Abstract. Sustainable aviation fuels can reduce contrail ice numbers and radiative forcing by contrail cirrus. We measured apparent ice emission indices for fuels with varying aromatic content at altitude ranges of 9.1–9.8 km and 11.4–11.6 km. Measurement data were collected during the ECLIF II/NDMAX flight experiment in January 2018. The fuels varied in both aromatic quantity and type. Between a sustainable aviation fuel blend and a reference fuel Jet A-1, a maximum reduction in apparent ice emission indices of 40 % was found. We show vertical ice number and extinction distributions for three different fuels and calculate representative contrail optical depths. Optical depths of contrails (0.5–3 minutes in age) were reduced by 40 to 52 % for a sustainable aviation fuel compared to the reference fuel. Our measurements suggest that sustainable aviation fuels result in reduced ice particle numbers, extinction coefficients, optical depth and climate impact from contrails.

Tiziana Bräuer et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-582', Andrew Heymsfield, 16 Aug 2021
    • AC1: 'Reply on RC1', Tiziana Bräuer, 01 Sep 2021
  • RC2: 'Comment on acp-2021-582', Anonymous Referee #2, 14 Sep 2021

Tiziana Bräuer et al.

Tiziana Bräuer et al.

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Short summary
Over half of aviations climate impact is caused by contrails. Biofuels can reduce the ice crystal numbers in contrails and mitigate the climate impact. The experiment ECLIF II/NDMAX in 2018 assessed the effects of biofuels on contrails and aviation emissions. The NASA DC-8 aircraft performed measurements inside the contrail of the DLR A320. One reference fuel and two blends of the biofuel HEFA and kerosene are analysed. We find a max reduction of contrail ice numbers through biofuel use of 40 %.
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