Ozone zonal asymmetry and planetary wave characterization during Antarctic spring

Ialongo, Iolanda; Sofieva, Viktoria; Kalakoski, Niilo; Tamminen, J.; Kyrölä, E.

doi:10.5194/acp-12-2603-2012

Cited by 28 publications

(28 citation statements)

References 32 publications

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“…2a) and the longitudinal position of the quasi-stationary ozone minimum (Fig. 2b) at 65 • S latitude, which is located in the edge region of the ozone hole and polar stratospheric vortex (Roscoe et al, 2012) and where the largest QSW amplitude is observed (Grytsai et al, 2007a;Ialongo et al, 2012). Cubic polynomial fits are shown by thick curves in Fig.…”

Section: Longitudinal Changes In the Qsw Structurementioning

confidence: 99%

“…Generally, planetary wave activity contributes significantly to the interannual variability of the ozone hole size, depth and duration (Kodera and Yamazaki, 1989;Varotsos, 2002Varotsos, , 2004Ialongo et al, 2012). However, wave activity did not undergo such significant decadal decrease to cause the decadal tendency in ozone depletion and, therefore, cannot be a contributing factor to the systematic QSW min eastward shift.…”

Section: Relation Between the Toc Asymmetry And Toc Levelmentioning

confidence: 99%

“…The scale of the waves in the zonal direction is typically characterized by zonal wave number, which is equal to the ratio of the corresponding great circle circumference at a given latitude to the wave length (Hirota and Hirooka, 1984;Hio and Yoden, 2004). The stationary part of the wave structure in the Southern Hemisphere (SH) spring stratosphere is mainly determined by a planetary wave with zonal number 1 (Hartmann et al, 1984;Quintanar and Mechoso, 1995;Ialongo et al, 2012), i.e., wave 1. The role of planetary waves was especially important in the unusual SH stratospheric warming in 2002 (Varotsos, 2002;Allen et al, 2003;Hoppel et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Evolution of the eastward shift in the quasi-stationary minimum of the Antarctic total ozone column

et al. 2017

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Abstract. The quasi-stationary pattern of the Antarctic total ozone has changed during the last 4 decades, showing an eastward shift in the zonal ozone minimum. In this work, the association between the longitudinal shift of the zonal ozone minimum and changes in meteorological fields in austral spring (September-November) for 1979-2014 is analyzed using ERA-Interim and NCEP-NCAR reanalyses. Regressive, correlative and anomaly composite analyses are applied to reanalysis data. Patterns of the Southern Annular Mode and quasi-stationary zonal waves 1 and 3 in the meteorological fields show relationships with interannual variability in the longitude of the zonal ozone minimum. On decadal timescales, consistent longitudinal shifts of the zonal ozone minimum and zonal wave 3 pattern in the middle-troposphere temperature at the southern midlatitudes are shown. Attribution runs of the chemistry-climate version of the Australian Community Climate and Earth System Simulator (ACCESS-CCM) model suggest that long-term shifts of the zonal ozone minimum are separately contributed by changes in ozone-depleting substances and greenhouse gases. As is known, Antarctic ozone depletion in spring is strongly projected on the Southern Annular Mode in summer and impacts summertime surface climate across the Southern Hemisphere. The results of this study suggest that changes in zonal ozone asymmetry accompanying ozone depletion could be associated with regional climate changes in the Southern Hemisphere in spring.

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Section: Longitudinal Changes In the Qsw Structurementioning

confidence: 99%

Section: Relation Between the Toc Asymmetry And Toc Levelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of the eastward shift in the quasi-stationary minimum of the Antarctic total ozone column

et al. 2017

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“…Indeed, many previous studies have demonstrated the important role of planetary waves in modulating ZAO variations (e.g. Peters and Entzian 1999;Peters et al 2008;Efstathiou et al 2003;Hio and Yoden 2004;Grytsai et al 2005;Gabriel et al 2011;Ialongo et al 2012;Zhang et al 2015) and have proposed that the planetary waves of tropospheric origin could affect TCO through tropopause height modulations and stratosphere-troposphere exchange processes. Nevertheless, whether and to what extent planetary wave changes exert an influence on the zonally asymmetric TCO trend in the past 30 years remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Zonally asymmetric trends of winter total column ozone in the northern middle latitudes

et al. 2018

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Using various satellite-based observations, a linear ozone transport model (LOTM), a chemistry-climate model (WACCM3) and an offline chemical transport model (SLIMCAT), zonally asymmetric trends of the total column ozone (TCO) in the northern middle latitudes during winter for the period 1979-2015 are analyzed and factors responsible for the trends are diagnosed. The results reveal that there are significant negative TCO trends over the North Pacific and positive TCO trends over the northwestern North America. The zonally asymmetric TCO trends are mainly contributed by the trends in partial column ozone in the upper troposphere and lower stratosphere (UTLS) which are closely related to the long-term changes of geopotential height in the troposphere. Furthermore, the trends of geopontential height in the UTLS are mainly modulated by pattern changes in the Arctic Oscillation (AO), the Cold Ocean-Warm Land (COWL) and the North Pacific (NP) index. Accordingly, the zonally asymmetric TCO trends can be largely reconstructed by the trends of the above three teleconnection patterns. Sea surface temperature (SST) changes over the Pacific Ocean and the Atlantic Ocean can also exert a significant contribution to the zonally asymmetric TCO trends through their influence on the COWL and NP patterns. In addition, chemical ozone loss partially offsets the positive trends in zonal TCO anomalies over Central Siberia and enhances the positive TCO trends over northwestern North America. However, the contribution of chemical processes to the zonally asymmetric TCO trends is relatively smaller than that of dynamical transport effects. Interpreting the zonally asymmetric TCO trends and their responsible factors would be helpful for accurately predicting the stratospheric ozone return date in the northern middle latitudes.

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“…ENSO (Diaz and Markgraf, 1992) can generate Rossby wave trains traveling from the tropics towards the Poles, and contributes to coupling between the stratosphere and troposphere over Antarctica (e.g., Hoskins and Karoly, 1981; Perlwitz and Harnik, 2004;Hu and Fu, 2009;Ialongo et al, 2012). The ENSO index is taken from the NOAA/NCEP (National Centers for Environmental Prediction) analysis.…”

Section: Proxy Data Setsmentioning

confidence: 99%

Long-term changes in the upper stratospheric ozone at Syowa, Antarctica

et al. 2014

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Abstract. Analyses of stratospheric ozone data determined from Dobson-Umkehr measurements since 1977 at the Syowa (69.0 • S, 39.6 • E), Antarctica, station show a significant decrease in ozone at altitudes higher than that of the 4 hPa pressure level during the 1980s and 1990s. Ozone values over Syowa have remained low since 2001. The time series of upper stratospheric ozone from the homogenized NOAA SBUV (Solar Backscatter Ultraviolet Instrument)(/2) 8.6 overpass data (±4 • , 24 h) are in qualitative agreement with those from the Syowa station data. Ozone recovery during the austral spring over the Syowa station appears to be slower than predicted by the equivalent effective stratospheric chlorine (EESC) curve. The long-term changes in the station's equivalent latitude (indicative of vortex size/position in winter and spring) are derived from MERRA (Modern Era Retrospective-analysis for Research and Applications) reanalyses at ∼ 2 and ∼ 50 hPa. These data are used to attribute some of the upper and middle stratospheric ozone changes to the changes in vortex position relative to the station's location. In addition, high correlation of the Southern Hemisphere annular mode (SAM) with polar upper stratospheric ozone during years of maximum solar activity points toward a strong relationship between the strength of the Brewer-Dobson circulation and the polar stratospheric ozone recovery. In the lower stratosphere, ozone recovery attributable to CFCs (chlorofluorocarbons) is still not definitive, whereas the recovery of the upper stratosphere is slower than predicted. Further research indicates that dynamical and other chemical changes in the atmosphere are delaying detection of recovery over this station.

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Ozone zonal asymmetry and planetary wave characterization during Antarctic spring

Cited by 28 publications

References 32 publications

Evolution of the eastward shift in the quasi-stationary minimum of the Antarctic total ozone column

Evolution of the eastward shift in the quasi-stationary minimum of the Antarctic total ozone column

Zonally asymmetric trends of winter total column ozone in the northern middle latitudes

Long-term changes in the upper stratospheric ozone at Syowa, Antarctica

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