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Impact of parametrizing microphysical processes in the jet and vortex phase on contrail cirrus properties and radiative forcing

Bier, Andreas and Burkhardt, Ulrike (2022) Impact of parametrizing microphysical processes in the jet and vortex phase on contrail cirrus properties and radiative forcing. Journal of Geophysical Research: Atmospheres, 127, pp. 1-29. Wiley. doi: 10.1029/2022JD036677. ISSN 2169-897X.

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Official URL: https://doi.org/10.1029/2022JD036677


Contrail ice nucleation and ice crystal loss during the vortex phase control ice crystal numbers in young contrails and can have a strong impact on the properties and the life cycle of contrail cirrus. For current soot number emissions, ice nucleation is controlled by the number of emitted soot particles and atmospheric conditions while the vortex phase loss depends predominantly on the nucleated ice crystal numbers and the ambient relative humidity. Initial ice crystal numbers after the vortex phase are close to the emitted soot particle number only for very low ambient temperatures (< 210 K) and for highly ice-supersaturated conditions. Higher temperatures and lower relative humidities lead to significantly decreased ice crystal numbers. Global climate model simulations show that initial contrail ice crystal numbers per fuel mass are on average 50-65% decreased relative to the soot number emission index in the extratropics and more in tropics. In the extratropics this is mainly caused by a high ice crystal loss during the vortex phase and in the (sub)tropics and at lower flight levels by decreased ice nucleation. Simulated ice crystal numbers per newly formed contrail length agree well with in-situ measurements over Central Europe within the variability of present-day soot number emissions. Our estimated global mean contrail cirrus radiative forcing (RF) for the year 2006 is 44 (31 - 49) mWm-2, around 22% lower than estimated in a previous study. When reducing soot number emissions by 80%, RF decreases by 41%, slightly less than suggested by a recent study.

Item URL in elib:https://elib.dlr.de/192478/
Document Type:Article
Additional Information:The authors gratefully acknowledge the resources of the Deutsches Klimarechenzentrum (DKRZ) granted by its Scientific Steering Committee (WLA) under project ID bd1033.
Title:Impact of parametrizing microphysical processes in the jet and vortex phase on contrail cirrus properties and radiative forcing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bier, AndreasDLR, IPAhttps://orcid.org/0000-0002-8016-3330UNSPECIFIED
Burkhardt, UlrikeDLR, IPAhttps://orcid.org/0000-0002-0742-7176UNSPECIFIED
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-29
EditorsEmailEditor's ORCID iDORCID Put Code
Riemer, NicoleDept. of Atmos. Scienc., Univ. of Illinois, Urbana, IL USAUNSPECIFIEDUNSPECIFIED
Series Name:Atmospheres
Keywords:soot emissions, contrail formation, contrail cirrus, climate model, radiative forcing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Bier, Andreas
Deposited On:15 Dec 2022 16:19
Last Modified:11 Dec 2023 09:12

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