Antarctic ozone hole as observed by IASI/MetOp for 2008–2010

Scannell, Claire; Hurtmans, Daniel; Boynard, Anne; Hadji‐Lazaro, Juliette; George, Maya; Delcloo, Andy; Tuinder, O. N. E.; Coheur, Pierre‐François; Clerbaux, Cathy

doi:10.5194/amt-5-123-2012

Cited by 29 publications

(29 citation statements)

References 38 publications

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“…In the lower stratosphere, this bias confirms the bias estimated by previous works (e.g. Scannell et al, 2012) and in other regions such as Iberian Peninsula (Anton et al, 2011), at midlatitudes and in the tropics . Dufour et al (2012) showed that three independent IASI ozone retrieval codes tend to overestimate ozone in the upper troposphere/lower stratosphere region in the midlatitudes and the tropics.…”

Section: Resultssupporting

confidence: 90%

“…Applications range from the study and the monitoring of the stratospheric ozone hole to tropospheric chemistry and air quality (e.g. Scannell et al, 2012;Parrington et al, 2012;Wespes et al, 2012). Ozone retrievals are performed in the 1025-1075 cm −1 spectral range, in order to minimize the computation time and avoid interferences with water vapour lines.…”

Section: Satellite Observationsmentioning

confidence: 99%

“…The profiles are retrieved in 39 fair spaced layers of 1 km thickness, with an extra layer from 39 km to the top of the atmosphere. The FORLI-O3 products have been validated with different ground-based, aircraft, and satellite data (Scannell et al, 2012;Anton et al, 2011;Pommier et al, 2012). Along with the retrieved profiles, error covariance and averaging kernel (AK) matrices are also provided.…”

Section: Satellite Observationsmentioning

confidence: 99%

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Intercomparison of polar ozone profiles by IASI/MetOp sounder with 2010 Concordiasi ozonesonde observations

et al. 2013

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Validation of ozone profiles measured from a nadir looking satellite instrument over Antarctica is a challenging task due to differences in their vertical sensitivity with ozonesonde measurements. In this paper, ozone observations provided by the Infrared Atmospheric Sounding Interferometer (IASI) instrument onboard the polar-orbiting satellite MetOp are compared with ozone profiles collected between August and October 2010 at McMurdo Station, Antarctica, during the Concordiasi measurement campaign. The main objective of the campaign was the satellite data validation. With this aim 20 zero-pressure sounding balloons carrying ozonesondes were launched during this period when the MetOp satellite was passing above McMurdo. This makes the dataset relevant for comparison, especially because the balloons covered the entire altitude range of IASI profiles. The validation methodology and the collocation criteria vary according to the availability of global positioning system auxiliary data with each electro-chemical cell ozonesonde observation. The relative mean difference is shown to depend on the vertical range investigated. The analysis shows a good agreement in the troposphere (below 10 km) and middle stratosphere (25–40 km), where the differences are lower than 10%. However a significant positive bias of about 10–26% is estimated in the lower stratosphere at 10–25 km, depending on altitude. The positive bias in the 10–25 km range is consistent with previously reported studies comparing in situ data with thermal infrared satellite measurements. This study allows for a better characterization of IASI-retrieved ozone over the polar region during ozone depletion/recovery processes

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Section: Resultssupporting

confidence: 90%

Section: Satellite Observationsmentioning

confidence: 99%

Section: Satellite Observationsmentioning

confidence: 99%

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Intercomparison of polar ozone profiles by IASI/MetOp sounder with 2010 Concordiasi ozonesonde observations

et al. 2013

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“…The ozone profiles are retrieved in near-real time, using the FORLI-O3 (Fast Optimal Retrievals on Layers for IASI) software , and will be available as part of the IASI Level 2 product processing facility (August et al, 2012, Table 1a-c). Validation was performed using ground-based (Antón et al, 2011;Dufour et al, 2012), aircraft (Parrington et al, 2012;Pommier et al, 2012), balloon (Gazeaux et al, 2013) and other satellite data (Scannell et al, 2012).…”

Section: Iasimentioning

confidence: 99%

Past changes in the vertical distribution of ozone – Part 1: Measurement techniques, uncertainties and availability

et al. 2014

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Abstract. Peak stratospheric chlorofluorocarbon (CFC) and other ozone depleting substance (ODS) concentrations were reached in the mid-to late 1990s. Detection and attribution of the expected recovery of the stratospheric ozone layer in an atmosphere with reduced ODSs as well as efforts to understand the evolution of stratospheric ozone in the presence of increasing greenhouse gases are key current research topics. These require a critical examination of the ozone changes with an accurate knowledge of the spatial (geographical and vertical) and temporal ozone response. For such an examination, it is vital that the quality of the measurements used be as high as possible and measurement uncertainties well quantified.

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“…Validation with and comparison to independent measurements of other IASI products have been performed Keim et al, 2009;Pittman et al, 2009;Viatte et al, 2011;Dufour et al, 2012;Pommier et al, 2012;Scannell et al, 2012;Gazeaux et al, 2013) and also comparison to models (Parrington et al, 2012). In general, these studies focus on the determination of the bias and the correlation with respect to independent measurements and on the determination of the information content.…”

Section: Existing Iasi Ozone Data Productsmentioning

confidence: 99%

Extending the satellite data record of tropospheric ozone profiles from Aura-TES to MetOp-IASI: characterisation of optimal estimation retrievals

et al. 2014

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Abstract. We apply the Tropospheric Emission Spectrometer (TES) ozone retrieval algorithm to Infrared Atmospheric Sounding Instrument (IASI) radiances and characterise the uncertainties and information content of the retrieved ozone profiles. This study focuses on mid-latitudes for the year 2008. We validate our results by comparing the IASI ozone profiles to ozone sondes. In the sonde comparisons, we find a negative bias (1-10 %) in the IASI profiles in the lower to mid-troposphere and a positive bias (up to 14 %) in the upper troposphere/lower stratosphere (UTLS) region. For the described cases, the degrees of freedom for signal are on average 3.2, 0.3, 0.8, and 0.9 for the columns 0 km -top of atmosphere, (0-6), (0-11), and (8-16) km, respectively. We find that our biases with respect to sondes and our degrees of freedom for signal for ozone are comparable to previously published results from other IASI ozone algorithms. In addition to evaluating biases, we validate the retrieval errors by comparing predicted errors to the sample covariance matrix of the IASI observations themselves. For the predicted versus empirical error comparison, we find that these errors are consistent and that the measurement noise and the interference of temperature and water vapour on the retrieval together mostly explain the empirically derived random errors. In general, the precision of the IASI ozone profiles is better than 20 %.

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Antarctic ozone hole as observed by IASI/MetOp for 2008–2010

Cited by 29 publications

References 38 publications

Intercomparison of polar ozone profiles by IASI/MetOp sounder with 2010 Concordiasi ozonesonde observations

Intercomparison of polar ozone profiles by IASI/MetOp sounder with 2010 Concordiasi ozonesonde observations

Past changes in the vertical distribution of ozone – Part 1: Measurement techniques, uncertainties and availability

Extending the satellite data record of tropospheric ozone profiles from Aura-TES to MetOp-IASI: characterisation of optimal estimation retrievals

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