A global ozone profile climatology for satellite retrieval algorithms based on Aura MLS measurements and the MERRA-2 GMI simulation

Ziemke, J. R.; Labow, G. J.; Kramarova, N. A.; McPeters, Richard D.; Bhartia, P. K.; Oman, Luke D.; Frith, S. M.; Haffner, D. P.

doi:10.5194/amt-14-6407-2021

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…The NASA Merged Ozone Data (MOD) time series is constructed using data from the Nimbus 4 BUV, Nimbus 7 SBUV, and six NOAA SBUV-2 instruments numbered 11, 14, and 16-19, and the Ozone Mapping and Profiler Suite Nadir Profiler (OMPS-NP) instrument aboard the Suomi-NPP satellite (Frith et al, 2014(Frith et al, , 2022.The instruments are of similar design, and (Kramarova et al, 2022). Version 8.7 also incorporates an updated a-priori with improved tropospheric representation based on GMI model output, and diurnal adjustments to ensure the a-priori profile correctly reflects the local solar time of each measurement (Ziemke et al, 2021). A post-retrieval diurnal correction is applied to adjust each instrument record to an equivalent measurement time of 1:30pm (Frith et al, 2020).…”

Section: Nasa Sbuv Mod V87mentioning

confidence: 99%

Global total ozone recovery trends derived from five merged ozone datasets

Weber

Arosio

Coldewey‐Egbers

et al. 2022

Preprint

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Abstract. We report on updated trends using different merged zonal mean total ozone datasets from satellite and ground-based observations for the period from 1979 to 2020. This work is an update from the trends reported in Weber et al. (2018) using the same datasets up to 2016. Merged datasets used in this study include NASA MOD v8.7 and NOAA Cohesive Data (COH) v8.6, both based on data from the series of Solar Backscatter UltraViolet (SBUV), SBUV-2, and Ozone Mapping and Profiler Suite (OMPS) satellite instruments (1978–present) as well as the Global Ozone Monitoring Experiment (GOME)-type Total Ozone (GTO-ECV) and GOME-SCIAMACHY-GOME-2 (GSG) merged datasets (both 1995–present), mainly comprising satellite data from GOME, SCIAMACHY, OMI, GOME-2A, -2B, and TROPOMI. The fifth dataset consists of the annual mean zonal mean data from ground-based measurements collected at the World Ozone and UV Radiation Data Center (WOUDC). Trends were determined by applying a multiple linear regression (MLR) to annual mean zonal mean data. The addition of four more years consolidated the fact that total ozone is indeed on slowly recovering in both hemispheres as a result of phasing out ozone depleting substances (ODS) as mandated by the Montreal Protocol. The near global ozone trend of the median of all datasets after 1996 was 0.5 ± 0.2 (2σ) %/decade, which is in absolute numbers roughly a third of the decreasing rate of 1.4 ± 0.6 %/decade from 1978 until 1996. The ratio of decline and increase is nearly identical to that of the EESC (equivalent effective stratospheric chlorine or stratospheric halogen) change rates before and after 1996 which confirms the success of the Montreal Protocol. The observed trends are also in very good agreement with the median of 17 chemistry climate models from CCMI (Chemistry Climate Model Initiative) with current ODS and GHG (greenhouse gas) scenarios. The positive ODS related trends in the NH after 1996 are only obtained with a sufficient number of terms in the MLR accounting properly for dynamical ozone changes (Brewer-Dobson circulation, AO, AAO). A standard MLR (limited to solar, QBO, volcanic, and ENSO) leads to zero trends showing that the small positive ODS related trends have been balanced by negative trend contributions from atmospheric dynamics resulting in nearly constant total ozone levels since 2000.

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Section: Nasa Sbuv Mod V87mentioning

confidence: 99%

Global total ozone recovery trends derived from five merged ozone datasets

Weber

Arosio

Coldewey‐Egbers

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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“…In addition to MLS, we also use the latest release of the Solar Backscatter Ultraviolet Radiometer (SBUV/2) Merged Ozone Dataset (MOD) (Frith et al, 2020;Ziemke et al, 2021). This dataset provides daily overpasses over many ground-based ozone measurement stations, including Payerne in Switzerland.…”

Section: Sbuv/2mentioning

confidence: 99%

Harmonized retrieval of middle atmospheric ozone from two microwave radiometers in Switzerland

Sauvageat

Barras²,

Hocke³

et al. 2022

Preprint

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Abstract. We present new harmonized ozone time series from two ground-based microwave radiometers in Switzerland: GROMOS and SOMORA. Both instruments measure hourly ozone profiles in the middle atmosphere (20–75 km) since more than two decades. As inconsistencies in long-term trends derived from these two instruments were detected, a harmonization project was initiated in 2019. The goal was to understand and reduce the discrepancies between the two data records. The harmonization has been completed for the data from 2009 until 2022 and has been successful at reducing the differences observed between both time series. It also explains the remaining differences between both instruments and flags their respective anomalous measurement periods in order to adapt their consideration for future trend computations. We describe the harmonization and the resulting time series in detail. We also highlight the improvements in the ozone retrievals with respect to the previous data processing. In the stratosphere and lower mesosphere, the seasonal ozone relative differences between both instruments are now within 10 % and show good correlations (R > 0.7) except for summertime. We also perform a comparison of these new data series against measurements from the satellite instruments Microwave Limb Sounder (MLS) and Solar Backscatter Ultraviolet Radiometer (SBUV) over Switzerland. Seasonal mean differences with MLS and SBUV are within 10 % in the stratosphere and lower mesosphere up to 60 km and increase rapidly above.

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Century-long column ozone records show that chemical and dynamical influences counteract each other

Brönnimann

2022

Commun Earth Environ

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The recovery of the ozone layer, which is expected as stratospheric chlorine levels have decreased over the past 25 years, remains difficult to detect. Column ozone has been monitored from 1924 to 1975 in Oxford, UK. Here, I present a century-long Oxford column ozone record, extended to the present based on re-discovered material and neighbouring series, and analyse it together with a record from Arosa, Switzerland that starts in 1926. Neither series shows a clear increase over the past 25 years but suggest stratospheric circulation. I separate chemical and dynamical effects using a regression approach and find that chemical recovery amounts to +8 DU between peak stratospheric chlorine concentrations in 1997 to 2021, consistent with model simulations. However, this trend is counteracted by a −5 DU dynamical trend. Century-long ozone records provide a window to the past dynamical, chemical and radiative state of the stratosphere and help better constrain circulation effects on ozone recovery.

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A global ozone profile climatology for satellite retrieval algorithms based on Aura MLS measurements and the MERRA-2 GMI simulation

Cited by 7 publications

References 30 publications

Global total ozone recovery trends derived from five merged ozone datasets

Global total ozone recovery trends derived from five merged ozone datasets

Harmonized retrieval of middle atmospheric ozone from two microwave radiometers in Switzerland

Century-long column ozone records show that chemical and dynamical influences counteract each other

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