Long-term wintertime trend of zonally asymmetric ozone in boreal extratropics during 1979-2016

Strong zonally asymmetric ozone (ZAO) changes are observed in the boreal extratropics for winter. During the TOMS (Total Ozone Mapping Spectrometer) period (1979-1992) the decrease of zonally asymmetric total ozone (ZATO) was twice as large as the observed zonal mean total ozone trend over Europe in...

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Bibliographic Details
Main Authors: Schneidereit, A., Peters, D.H.W.
Format: Article in Journal/Newspaper
Language:English
Published: Basel : MDPI AG 2018
Subjects:
Ozone transport
Quasi-bidecadal trend
Total column ozone
zonally asymmetric ozone
Ultra-long planetary waves
Horizontal components
Planetary Waves
Total ozone mapping spectrometer
Transport modeling
Vertical advection
Ozone
ageostrophic flow
atmospheric chemistry
atmospheric transport
extratropical environment
long range transport
planetary wave
stratosphere
temporal variation
trend analysis
winter
Atlantic Ocean
Atlantic Ocean (North)
Europe
550
Arctic
North Atlantic
Online Access:https://doi.org/10.34657/4632
https://oa.tib.eu/renate/handle/123456789/6003
Description
Summary:Strong zonally asymmetric ozone (ZAO) changes are observed in the boreal extratropics for winter. During the TOMS (Total Ozone Mapping Spectrometer) period (1979-1992) the decrease of zonally asymmetric total ozone (ZATO) was twice as large as the observed zonal mean total ozone trend over Europe in January mainly caused by ultra-long wave transport. Recent studies have demonstrated that the ozone evolution reveals three different quasi-bidecadal trend stages: (i) Decline, (ii) leveling, and (ii) healing. This study focuses on the ZAO structure in boreal extratropics and on ozone transport changes by ultra-long waves during winter months. ERA-Interim data together with a linearized transport model are used. During the healing stage ZATO increases significantly over the North Atlantic/European region for January. The ZATO increase (healing stage) and ZATO decrease (decline stage) are caused by different monthly mean ozone transport characteristics of ultra-long planetary waves over the North Atlantic/European region. Furthermore, the vertical advection (ageostrophic transport) of ozone versus its horizontal component dominates in the lower and middle stratosphere during the healing stage. It is hypothesized that these ageostrophic wind changes are mainly caused by a wave train directed northeastwards which seems to be directly linked to the Arctic warming. © 2018 by the authors. Leibniz_Fonds publishedVersion

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