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A new time-independent formulation of fractional release

Ostermöller, Jennifer and Bönisch, Harald and Jöckel, Patrick and Engel, Andreas (2017) A new time-independent formulation of fractional release. Atmospheric Chemistry and Physics (ACP), 17 (6), pp. 3785-3797. Copernicus Publications. doi: 10.5194/acp-17-3785-2017. ISSN 1680-7316.

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Official URL: http://www.atmos-chem-phys.net/17/3785/2017/


The fractional release factor (FRF) gives information on the amount of a halocarbon that is released at some point into the stratosphere from its source form to the inorganic form, which can harm the ozone layer through catalytic reactions. The quantity is of major importance because it directly affects the calculation of the ozone depletion potential (ODP). In this context time-independent values are needed which, in particular, should be independent of the trends in the tropospheric mixing ratios (tropospheric trends) of the respective halogenated trace gases. For a given atmospheric situation, such FRF values would represent a molecular property. We analysed the temporal evolution of FRF from ECHAM/MESSy Atmospheric Chemistry (EMAC) model simulations for several halocarbons and nitrous oxide between 1965 and 2011 on different mean age levels and found that the widely used formulation of FRF yields highly time-dependent values. We show that this is caused by the way that the tropospheric trend is handled in the widely used calculation method of FRF. Taking into account chemical loss in the calculation of stratospheric mixing ratios reduces the time dependence in FRFs. Therefore we implemented a loss term in the formulation of the FRF and applied the parameterization of a "mean arrival time" to our data set. We find that the time dependence in the FRF can almost be compensated for by applying a new trend correction in the calculation of the FRF. We suggest that this new method should be used to calculate time-independent FRFs, which can then be used e.g. for the calculation of ODP.

Item URL in elib:https://elib.dlr.de/111564/
Document Type:Article
Title:A new time-independent formulation of fractional release
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ostermöller, JenniferUniv. FrankfurtUNSPECIFIED
Bönisch, HaraldKarlsruhe Instiute of TechnologyUNSPECIFIED
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Engel, AndreasUniv. FrankfurtUNSPECIFIED
Date:20 March 2017
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 3785-3797
Publisher:Copernicus Publications
Keywords:ECHAM/MESSy Atmospheric Chemistry, EMAC, chemistry climate model, stratosphere, fractional release factors, halocarbons, ozone depletion potential, Earth System Chemistry integrated Modelling (ESCiMo)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:23 Mar 2017 14:53
Last Modified:02 May 2019 13:59

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