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Attribution of ozone changes to dynamical and chemical processes in CCMs and CTMs

Garny, Hella und Grewe, Volker und Dameris, Martin und Bodeker, Greg und Stenke, Andrea (2011) Attribution of ozone changes to dynamical and chemical processes in CCMs and CTMs. Geoscientific Model Development, 4, Seiten 271-286. DOI: 10.5194/gmd-4-271-2011.

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Offizielle URL: http://www.geosci-model-dev.net/4/271/2011/


Chemistry-climate models (CCMs) are commonly used to simulate the past and future development of Earth’s ozone layer. The fully coupled chemistry schemes calculate the chemical production and destruction of ozone interactively and ozone is transported by the simulated atmospheric flow. Due to the complexity of the processes acting on ozone it is not straightforward to disentangle the influence of individual processes on the temporal development of ozone concentrations. A method is introduced here that quantifies the influence of chemistry and transport on ozone concentration changes and that is easily implemented in CCMs and chemistry-transport models (CTMs). In this method, ozone tendencies (i.e. the time rate of change of ozone) are partitioned into a contribution from ozone production and destruction (chemistry) and a contribution from transport of ozone (dynamics). The influence of transport on ozone in a specific region is further divided into export of ozone out of that region and import of ozone from elsewhere into that region. For this purpose, a diagnostic is used that disaggregates the ozone mixing ratio field into 9 separate fields according to in which of 9 predefined regions of the atmosphere the ozone originated. With this diagnostic the ozone mass fluxes between these regions are obtained. Furthermore, this method is used here to attribute long-term changes in ozone to chemistry and transport. The relative change in ozone from one period to another that is due to changes in production or destruction rates, or due to changes in import or export of ozone, are quantified. As such, the diagnostics introduced here can be used to attribute changes in ozone on monthly, interannual and long-term time-scales to the responsible mechanisms. Results from a CCM simulation are shown here as examples, with the main focus of the paper being on introducing the method.

Titel:Attribution of ozone changes to dynamical and chemical processes in CCMs and CTMs
AutorenInstitution oder E-Mail-Adresse der Autoren
Garny, HellaDLR-IPA
Grewe, VolkerDLR-IPA
Dameris, MartinDLR-IPA
Bodeker, GregBodeker Scientific, Alexandra, NZ
Stenke, AndreaETH Zürich
Erschienen in:Geoscientific Model Development
Referierte Publikation:Ja
In Open Access:Ja
In ISI Web of Science:Ja
DOI :10.5194/gmd-4-271-2011
Seitenbereich:Seiten 271-286
Stichwörter:Stratosphere, numerical modelling, chemistry, transport
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Prof. Dr. rer. nat. Martin Dameris
Hinterlegt am:18 Nov 2011 15:23
Letzte Änderung:12 Dez 2013 21:24

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