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A refined method for calculating equivalent effective stratospheric chlorine

Engel, A.; Bönisch, H. 1; Ostermöller, J.; Chipperfield, M. P.; Dhomse, S.; Jöckel, P.
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

Chlorine and bromine atoms lead to catalytic depletion of ozone in the stratosphere. Therefore the use and production of ozone-depleting substances (ODSs) containing chlorine and bromine is regulated by the Montreal Protocol to protect the ozone layer. Equivalent effective stratospheric chlorine (EESC) has been adopted as an appropriate metric to describe the combined effects of chlorine and bromine released from halocarbons on stratospheric ozone. Here we revisit the concept of calculating EESC. We derive a refined formulation of EESC based on an advanced concept of ODS propagation into the stratosphere and reactive halogen release. A new transit time distribution is introduced in which the age spectrum for an inert tracer is weighted with the release function for inorganic halogen from the source gases. This distribution is termed the “release time distribution”. We show that a much better agreement with inorganic halogen loading from the chemistry transport model TOMCAT is achieved compared with using the current formulation. The refined formulation shows EESC levels in the year 1980 for the mid-latitude lower stratosphere, which are significantly lower than previously calculated. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000080082
Veröffentlicht am 08.02.2018
Originalveröffentlichung
DOI: 10.5194/acp-18-601-2018
Scopus
Zitationen: 18
Web of Science
Zitationen: 18
Dimensions
Zitationen: 23
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
urn:nbn:de:swb:90-800822
KITopen-ID: 1000080082
HGF-Programm 12.04.01 (POF III, LK 01) Stratosphere-Troposphere Exchange (STE)
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 18
Heft 2
Seiten 601-619
Nachgewiesen in Dimensions
Scopus
Web of Science
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