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On the pattern of interannual polar vortex–ozone co-variability during northern hemispheric winter

Harzer, Frederik und Garny, Hella und Ploeger, Felix und Bönisch, Harald und Hoor, P. und Birner, Thomas (2023) On the pattern of interannual polar vortex–ozone co-variability during northern hemispheric winter. Atmospheric Chemistry and Physics (ACP), Seiten 10661-10675. Copernicus Publications. doi: 10.5194/acp-23-10661-2023. ISSN 1680-7316.

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Offizielle URL: https://doi.org/10.5194/acp-23-10661-2023

Kurzfassung

Stratospheric ozone is important for both stratospheric and surface climate. In the lower stratosphere during winter, its variability is governed primarily by transport dynamics induced by wave–mean flow interactions. In this work, we analyze interannual co-variations between the distribution of zonal-mean ozone and the strength of the polar vortex as a measure of dynamical activity during northern hemispheric winter. Specifically, we study co-variability between the seasonal means of the ozone field from modern reanalyses and polar-capaveraged temperature at 100 hPa, which represents a robust and well-defined index for polar vortex strength. We focus on the vertically resolved structure of the associated extratropical ozone anomalies relative to the winter climatology and shed light on the transport mechanisms that are responsible for this response pattern. In particular, regression analysis in pressure coordinates shows that anomalously weak polar vortex years are associated with three pronounced local ozone maxima just above the polar tropopause, in the lower to mid-stratosphere and near the stratopause. In contrast, in isentropic coordinates, using ERA-Interim reanalysis data, only the midto lower stratosphere shows increased ozone, while a small negative ozone anomaly appears in the lowermost stratosphere. These differences are related to contributions due to anomalous adiabatic vertical motion, which are implicit in potential temperature coordinates. Our analyses of the ozone budget in the extratropical middle stratosphere show that the polar ozone response maximum around 600 K and the negative anomalies around 450 K beneath both reflect the combined effects of anomalous diabatic downwelling and quasi-isentropic eddy mixing, which are associated with consecutive counteracting anomalous ozone tendencies on daily timescales. We find that approx. 71 % of the total variability in polar column ozone in the stratosphere is associated with year-by-year variations in polar vortex strength based on ERA5 reanalyses for the winter seasons 1980–2022. MLS observations for 2005–2020 show that around 86 % can be explained by these co-variations with the polar vortex.

elib-URL des Eintrags:https://elib.dlr.de/202878/
Dokumentart:Zeitschriftenbeitrag
Titel:On the pattern of interannual polar vortex–ozone co-variability during northern hemispheric winter
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Harzer, FrederikLMU, MünchenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Garny, HellaDLR, IPAhttps://orcid.org/0000-0003-4960-2304NICHT SPEZIFIZIERT
Ploeger, FelixFZ JülichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bönisch, HaraldKIT, IMK, KarlsruheNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hoor, P.Univ. Mainz, MainzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Birner, ThomasLMU, MünchenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:26 September 2023
Erschienen in:Atmospheric Chemistry and Physics (ACP)
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.5194/acp-23-10661-2023
Seitenbereich:Seiten 10661-10675
Verlag:Copernicus Publications
ISSN:1680-7316
Status:veröffentlicht
Stichwörter:Stratospheric Ozone, Circulation
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 - Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Erdsystem-Modellierung
Hinterlegt von: Garny, Hella
Hinterlegt am:20 Feb 2024 11:45
Letzte Änderung:11 Nov 2024 13:43

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