A new health check of the ozone layer at global and regional scales

Coldewey‐Egbers, Melanie; Loyola, G R Diego; Braesicke, Peter; Dameris, Martin; Roozendaël, Michel Van; Lerot, Christophe; Zimmer, Walter

doi:10.1002/2014gl060212

Cited by 23 publications

(36 citation statements)

References 59 publications

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“…When they use the EESC proxy, the trend is increasing with latitude so that at the Lauder latitude it reaches about 4-5 DU decade −1 . Our non-significant trends at Jungfraujoch, Izaña and Lauder, and positive trend at Wollongong are also in agreement with the recent study of Coldewey-Egbers et al (2014), which provides trends using a similar period (1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013) of merged satellite data sets. For Wollongong, since the total column positive trend is due to the ozone trends in the lower and middle stratosphere, it cannot be attributed unambiguously to the EESCs decline.…”

Section: Total Columnssupporting

confidence: 93%

Trends of ozone total columns and vertical distribution from FTIR observations at eight NDACC stations around the globe

et al. 2015

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Abstract. Ground-based Fourier transform infrared (FTIR) measurements of solar absorption spectra can provide ozone total columns with a precision of 2 % but also independent partial column amounts in about four vertical layers, one in the troposphere and three in the stratosphere up to about 45 km, with a precision of 5-6 %. We use eight of the Network for the Detection of Atmospheric Composition Change (NDACC) stations having a long-term time series of FTIR ozone measurements to study the total and vertical ozone trends and variability, namely, Ny-Ålesund (79

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Section: Total Columnssupporting

confidence: 93%

Trends of ozone total columns and vertical distribution from FTIR observations at eight NDACC stations around the globe

et al. 2015

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“…Stolarski et al, 1991Stolarski et al, , 2006Fioletov et al, 2002;Brunner et al, 2006;WMO, 2007;Mäder et al, 2007;Harris et al, 2008;Chehade et al, 2014;Coldewey-Egbers et al, 2014) and UV radiation calculations at the Earth's surface (Lindfors et al, 2009;Krzyścin, 2008). Such an ozone data set is also important for quantifying ozone depletion and detecting the first signs of recovery (e.g.…”

Section: Introductionmentioning

confidence: 99%

Extended and refined multi sensor reanalysis of total ozone for the period 1970–2012

Allaart

Eskes

2015

Atmos. Meas. Tech.

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Abstract. The ozone multi-sensor reanalysis (MSR) is a multi-decadal ozone column data record constructed using all available ozone column satellite data sets, surface Brewer and Dobson observations and a data assimilation technique with detailed error modelling. The result is a high-resolution time series of 6-hourly global ozone column fields and forecast error fields that may be used for ozone trend analyses as well as detailed case studies.The ozone MSR is produced in two steps. First, the latest reprocessed versions of all available ozone column satellite data sets are collected and then are corrected for biases as a function of solar zenith angle (SZA), viewing zenith angle (VZA), time (trend), and stratospheric temperature using surface observations of the ozone column from Brewer and Dobson spectrophotometers from the World Ozone and Ultraviolet Radiation Data Centre (WOUDC). Subsequently the de-biased satellite observations are assimilated within the ozone chemistry and data assimilation model TMDAM.The MSR2 (MSR version 2) reanalysis upgrade described in this paper consists of an ozone record for the 43-year period 1970-2012. The chemistry transport model and data assimilation system have been adapted to improve the resolution, error modelling and processing speed. Backscatter ultraviolet (BUV) satellite observations have been included for the period 1970-1977. The total record is extended by 13 years compared to the first version of the ozone multi sensor reanalysis, the MSR1. The latest total ozone retrievals of 15 satellite instruments are used: BUV-Nimbus4, TOMSNimbus7, TOMS-EP, , GOME, SCIAMACHY, OMI and GOME-2. The resolution of the model runs, assimilation and output is increased from 2The analysis is driven by 3-hourly meteorology from the ERA-Interim reanalysis of the European Centre for Medium-Range Weather Forecasts (ECMWF) starting from 1979, and ERA-40 before that date. The chemistry parameterization has been updated. The performance of the MSR2 analysis is studied with the help of observation-minus-forecast (OmF) departures from the data assimilation, by comparisons with the individual station observations and with ozone sondes. The OmF statistics show that the mean bias of the MSR2 analyses is less than 1 % with respect to de-biased satellite observations after 1979.

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“…The WMO assessment concluded that, at most latitudes, it is not yet possible to determine a statistically significant increase in total column ozone (lower stratosphere) because the expectedly small trends are masked by large interannual variability ( Fig. 2.43; see also Chehade et al 2014;Coldewey-Egbers et al 2014). In the tropics no discernible long-term stratospheric trends have been observed for the entire period.…”

mentioning

confidence: 99%

“…In the tropics no discernible long-term stratospheric trends have been observed for the entire period. Note that trends in tropical tropospheric ozone can potentially mask stratospheric trends in tropical total columns (Shepherd et al 2014) and there is evidence that decadal trends in the ENSO may have produced tropospheric ozone increases in some tropical regions during the past two decades ( Coldewey-Egbers et al 2014).…”

mentioning

confidence: 99%