Total ozone trends from 1979 to 2016 derived from five merged observational datasets – the emergence into ozone recovery

Weber, Mark; Coldewey‐Egbers, Melanie; Fioletov, Vitali; Frith, S. M.; Wild, Jeannette; Burrows, J. P.; Long, Craig S.; Loyola, Diego

doi:10.5194/acp-18-2097-2018

Cited by 141 publications

(149 citation statements)

References 87 publications

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“…At least three recently published papers (Steinbrecht et al, 2017;Weber et al, 2018;Ball et al, 2018) show that total ozone and ozone profile trends are consistent with earlier WMO Scientific Assessment of Ozone Depletion (2014) findings. Despite the addition of four more years since WMO Scientific Assessment of Ozone Depletion (2014), Weber et al (2018) show that for most datasets and regions the trends in total ozone, since stratospheric halogens reached their maximum around 1997, are not significantly different from zero.…”

Section: Introductionsupporting

confidence: 79%

“…Despite the addition of four more years since WMO Scientific Assessment of Ozone Depletion (2014), Weber et al (2018) show that for most datasets and regions the trends in total ozone, since stratospheric halogens reached their maximum around 1997, are not significantly different from zero. In the case of ozone profile trends, however, Steinbrecht et al (2017) confirmed increasing trends in the upper stratosphere (2 hPa) as first reported in WMO Scientific Assessment of Ozone Depletion (2014).…”

Section: Introductionmentioning

confidence: 88%

“…A number of proxies have been used to explain the variability in space and time of the vertical ozone distribution, superimposed to the dominating annual cycle (Zerefos et al, 1992;Reinsel et al, 2002;Newchurch et al, 2003;Reinsel et al, 2005;Zanis et al, 2006;Nair et al, 2013;Frith et al, 2014;Harris et al, 2015;Steinbrecht et al, 2017;Weber et al, 2018;WMO Scientific Assessment of Ozone Depletion, 2007, 2011. Each proxy reflects ozone variability in a different way.…”

Section: The Role Of Proxies In the Variability In Ozonementioning

confidence: 99%

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Representativeness of single lidar stations for zonally averaged ozone profiles, their trends and attribution to proxies

et al. 2018

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Section: Introductionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 88%

Section: The Role Of Proxies In the Variability In Ozonementioning

confidence: 99%

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Representativeness of single lidar stations for zonally averaged ozone profiles, their trends and attribution to proxies

et al. 2018

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“…In the 2017‐extended data set, OMPS is adjusted to the SBUV/2 data from NOAA 19. Total column data are the sum of the layer profile data. GOME‐SCIAMACHY‐GOME‐2 (GSG) merged data set (1995–2017) constructed by merging total column ozone from Global Ozone Monitoring Experiment (GOME), the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY), and GOME‐2A instruments retrieved with the WFDOAS algorithm (e.g., Weber et al, , ). The SCIAMACHY and GOME‐2A data were successively bias corrected during overlap periods to the starting record of GOME.…”

Section: Ozone Data Setsmentioning

confidence: 99%

On the Cause of Recent Variations in Lower Stratospheric Ozone

Chipperfield

Dhomse

Hossaini

et al. 2018

Geophysical Research Letters

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123

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We use height-resolved and total column satellite observations and 3-D chemical transport model simulations to study stratospheric ozone variations during 1998-2017 as ozone-depleting substances decline. In 2017 extrapolar lower stratospheric ozone displayed a strong positive anomaly following much lower values in 2016. This points to large interannual variability rather than an ongoing downward trend, as reported recently by Ball et al. (2018Ball et al. ( , https://doi.org/10.5194/acp-18-1379Ball et al. ( -2018. The observed ozone variations are well captured by the chemical transport model throughout the stratosphere and are largely driven by meteorology. Model sensitivity experiments show that the contribution of past trends in short-lived chlorine species to the ozone changes is small. Similarly, the potential impact of modest trends in natural brominated short-lived species is small. These results confirm the important role that atmospheric dynamics plays in controlling ozone in the extrapolar lower stratosphere on multiannual time scales and the continued importance of monitoring ozone profiles as the stratosphere changes.Plain Language Summary Emission of long-lived chlorine and bromine-containing ozone-depleting substances has led to the depletion of the ozone layer, most notably the Antarctic ozone hole. Policy action through the Montreal Protocol has phased out the production of the major long-lived ozone-depleting substances. Consequently, stratospheric chlorine and bromine amounts are declining, and we expect the ozone layer to slowly recover. However, although the tropical lower stratosphere is not a region where large ozone loss has so-far been observed, a recent study by Ball et al. (2018) suggested that ozone there is decreasing, in disagreement with models and expectations of ozone recovery. We use updated observations and an atmospheric model to investigate these issues. First, we use an additional year of observations which show that ozone values in the lower stratosphere increased in 2017, which is a consequence of variations in atmospheric dynamics. Second, our 3-D model performs well in reproducing the observed ozone variations. Although the model is not perfect, the comparisons suggest that we do have a good understanding of the lower stratospheric ozone. Third, we quantify the role of short-lived chlorine and bromine compounds, which are not controlled by the Montreal Protocol, on the recent ozone changes. The effect is small.

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“…Halogen‐induced ozone loss occurred until the mid‐1990s, as seen from the total column ozone trend during 1979–1995 at 99.9% significance level (black dotted, Figure d). Thereafter, the total column ozone basically exhibits internal variations (Shepherd et al, ; Weber et al, ). Moreover, the total column ozone in both midlatitudes and Arctic shows similar decadal variations (Figure S3d).…”

Section: Resultsmentioning

confidence: 99%

Decadal Variations in the Winter Beaufort High and the Stratospheric Polar Vortex

Zhang

Perrie

Long

2019

Geophysical Research Letters

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We show that a weakened Beaufort High in late winter is becoming more common since the late 1980s, and this weakening is related to decadal changes in Northern Hemisphere ozone depletion. During this time, the stratospheric polar vortex has experienced a decadal northeastward displacement. Such displacement is associated with the variability of the East Asia‐eastern North America dipole. A positive Asia‐eastern North America dipole leads to zonal asymmetry in the ozone depletion with maximum loss over eastern Eurasia. Positive feedback with the zonally asymmetric ozone loss contributes to increased occurrence of the northeastward displacement of the stratospheric polar vortex. The northeastward displaced polar vortex enhances baroclinicity over the Eurasian Arctic and causes an increase in the frequency and intensity of cyclones and a decrease in anticyclones over the Eurasian Arctic. Concomitantly, the Beaufort High tends to have weakened.

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Total ozone trends from 1979 to 2016 derived from five merged observational datasets – the emergence into ozone recovery

Abstract: Abstract. We report on updated trends using different merged datasets from satellite and ground-based observations for the period from 1979 to 2016. Trends were determined by applying a multiple linear regression

Cited by 141 publications

References 87 publications

Representativeness of single lidar stations for zonally averaged ozone profiles, their trends and attribution to proxies

Representativeness of single lidar stations for zonally averaged ozone profiles, their trends and attribution to proxies

On the Cause of Recent Variations in Lower Stratospheric Ozone

Decadal Variations in the Winter Beaufort High and the Stratospheric Polar Vortex

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