Vertical Structure of the Anomalous 2002 Antarctic Ozone Hole

Kondragunta, Shobha; Flynn, L. E.; Neuendorffer, Arthur C.; Miller, A. J.; Long, Craig S.; Nagatani, R. M.; Zhou, Shuntai; Beck, Trevor; Beach, E.; McPeters, Richard D.; Stolarski, R. S.; Bhartia, P. K.; DeLand, Matthew T.; Huang, Liang

doi:10.1175/jas-3324.1

Cited by 20 publications

(16 citation statements)

References 22 publications

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“…The GOATS analyses capture the total ozone morphology of this period including the splitting of the ozone hole into two pieces on the 24th, the return to a single smaller ozone hole on the 30th, and the ridges of high ozone surrounding the ozone hole. These maps agree well with the SBUV/2 total ozone maps analyzed for this period by Kondragunta et al (2005). Note that the GOATS low total ozone values (∼150 DU) on 20 September 2002 are produced by the assimilated SBUV/2 observations that often see into the disturbed low ozone region during the first 20 days of the assimilation.…”

Section: Goats Experimentssupporting

confidence: 83%

Effects of model chemistry and data biases on stratospheric ozone assimilation

et al. 2007

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Abstract. The innovations or observation minus forecast (O–F) residuals produced by a data assimilation system provide a convenient metric of evaluating global analyses. In this study, O–F statistics from the Global Ozone Assimilation Testing System (GOATS) are used to examine how ozone assimilation products and their associated O–F statistics depend on input data biases and ozone photochemistry parameterizations (OPP). All the GOATS results shown are based on a 6-h forecast and analysis cycle using observations from SBUV/2 (Solar Backscatter UltraViolet instrument-2) during September–October 2002. Results show that zonal mean ozone analyses are more independent of observation biases and drifts when using an OPP, while the mean ozone O–Fs are more sensitive to observation drifts when using an OPP. In addition, SD O–Fs (standard deviations) are reduced in the upper stratosphere when using an OPP due to a reduction of forecast model noise and to increased covariance between the forecast model and the observations. Experiments that changed the OPP reference state to match the observations by using an "adaptive" OPP scheme reduced the mean ozone O–Fs at the expense of zonal mean ozone analyses being more susceptible to data biases and drifts. Additional experiments showed that the upper boundary of the ozone DAS can affect the quality of the ozone analysis and therefore should be placed well above (at least a scale height) the region of interest.

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Section: Goats Experimentssupporting

confidence: 83%

Effects of model chemistry and data biases on stratospheric ozone assimilation

et al. 2007

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“…The role of zonal asymmetry becomes more important due to vertical non-alignment of the vortex structure (Varotsos, 2004). The vortex appears progressively shifted with height towards South America, and high ozone in the middle stratosphere (around 30 km) within the Australian sector masks ozone depletion in the lower stratosphere (Kondragunta et al, 2005;Tully et al, 2008), resulting in additional variability of stratospheric temperature, column ozone and ozone hole characteristics. In this way, vertical changes in the QSW1 structure impact the ozone profile over Antarctica and contribute to the strong correlation between zonal asymmetry in ozone distribution (QSW min longitude) and stratospheric temperature in Fig.…”

Section: The Qsw1/qsw3 Patternsmentioning

confidence: 99%

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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“…For example, according to Kondragunta et al (2005), in the case of the 2002 ozone hole, the offset between the vortices in the lower stratosphere and middle stratosphere masked the ozone depletion in the lower stratosphere and resulted in higher total ozone column and a smaller ozone hole size estimate. According to Tully et al (2008), a progressive poleward shift with increasing altitude is seen in the Eastern Hemisphere ozone maximum in September 2007 (their Fig.…”

Section: Ozone Mixing Effectsmentioning

confidence: 99%

Quasi-stationary planetary waves in late winter Antarctic stratosphere temperature as a possible indicator of spring total ozone

et al. 2012

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Abstract. Stratospheric preconditions for the annual Antarctic ozone hole are analyzed using the amplitude of quasistationary planetary waves in temperature as a predictor of total ozone column behaviour. It is found that the quasistationary wave amplitude in August is highly correlated with September-November total ozone over Antarctica with correlation coefficient (r) as high as 0.83 indicating that quasi-stationary wave effects in late winter have a persisting influence on the evolution of the ozone hole during the following three months. Correlation maxima are found in both the lower and middle stratosphere. These likely result from the influence of wave activity on ozone depletion due to chemical processes, and ozone accumulation due to largescale ozone transport, respectively. Both correlation maxima indicate that spring total ozone tends to increase in the case of amplified activity of quasi-stationary waves in late winter. Since the stationary wave number one dominates the planetary waves that propagate into the Antarctic stratosphere in late austral winter, it is largely responsible for the stationary zonal asymmetry of the ozone hole relative to the South Pole. Processes associated with zonally asymmetric ozone and temperature which possibly contribute to differences in the persistence and location of the correlation maxima are discussed.

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Vertical Structure of the Anomalous 2002 Antarctic Ozone Hole

Cited by 20 publications

References 22 publications

Effects of model chemistry and data biases on stratospheric ozone assimilation

Effects of model chemistry and data biases on stratospheric ozone assimilation

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

Quasi-stationary planetary waves in late winter Antarctic stratosphere temperature as a possible indicator of spring total ozone

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