Early results and Validation of SAGE III-ISS Ozone Profile Measurements from Onboard the International Space Station

McCormick, M. P.; Lei, Liqiao; Hill, Michael T.

doi:10.5194/amt-2019-353

Cited by 3 publications

(6 citation statements)

References 17 publications

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“…In this study, the agreement between SAGE III solar ozone data and correlative sonde/lidar data is found to be better than in the analysis of McCormick et al (2020). This could result from the tighter coincidence criteria and from having more coincident profiles in this study.…”

Section: Discussioncontrasting

confidence: 58%

“…Positive biases of ~5–10% in SAGE III ozone, however, were found in the same altitude range in our study. Similarly, these differences could result from different coincidence criteria being used in both studies, with coincidences defined by latitude differences less than ±5 o (or ± 10 o in the Southern Hemisphere) in McCormick et al (2020), while a criterion of ±2 o was used in our study. Dissimilar techniques to minimize the effect of differing vertical resolutions could also lead to some discrepancies, especially in the region (e.g., UT/LS) where the vertical gradient of ozone is large.…”

Section: Discussionmentioning

confidence: 83%

“…For comparisons between SAGE III and ACE‐FTS, similar results were found in both studies, with mean differences less than 5% for altitudes above 20 km. For altitudes below 20 km, SAGE III ozone generally showed a negative bias (>10%) relative to ACE‐FTS, especially in the Southern Hemisphere, based on McCormick et al (2020). Positive biases of ~5–10% in SAGE III ozone, however, were found in the same altitude range in our study.…”

Section: Discussionmentioning

confidence: 93%

“…This could result from the tighter coincidence criteria and from having more coincident profiles in this study. Furthermore, more sophisticated techniques were used to account for different vertical resolutions between SAGE III and correlative ozone profiles; linear interpolation of profiles was used in the work by McCormick et al (2020). For comparisons between SAGE III and ACE‐FTS, similar results were found in both studies, with mean differences less than 5% for altitudes above 20 km.…”

Section: Discussionmentioning

confidence: 99%

“…McCormick et al (2020) evaluated the first year of SAGE III/ISS ozone profiles with ozonesondes and lidar measurements at Hohenpeissenberg and Lauder, as well as with observations from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE‐FTS). They found that the percentage differences between SAGE III/ISS solar ozone and ground‐based ozonesonde/lidar measurements are generally less than 10% in the stratosphere, with the best agreement of ~5% between SAGE III and Hohenpeissenberg lidar for altitudes of 20–40 km.…”

Section: Introductionmentioning

confidence: 99%

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Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground‐Based Measurements

et al. 2020

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The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) was launched on 19 February 2017 and began routine operation in June 2017. The first 2 years of SAGE III/ISS (v5.1) solar occultation ozone data were evaluated by using correlative satellite and ground‐based measurements. Among the three (MES, AO3, and MLR) SAGE III/ISS retrieved solar ozone products, AO3 ozone shows the smallest bias and best precision, with mean biases less than 5% for altitudes ~15–55 km in the midlatitudes and ~20–55 km in the tropics. In the lower stratosphere and upper troposphere, AO3 ozone shows high biases that increase with decreasing altitudes and reach ~10% near the tropopause. Preliminary studies indicate that those high biases primarily result from the contributions of the oxygen dimer (O4) not being appropriately removed within the ozone channel. The precision of AO3 ozone is estimated to be ~3% for altitudes between 20 and 40 km. It degrades to ~10–15% in the lower mesosphere (~55 km) and ~20–30% near the tropopause. There could be an altitude registration error of ~100 m in the SAGE III/ISS auxiliary temperature and pressure profiles. This, however, does not affect retrieved ozone profiles in native number density on geometric altitude coordinates. In the upper stratosphere and lower mesosphere (~40–55 km), the SAGE III/ISS (and SAGE II) retrieved ozone values show sunrise/sunset differences of ~5–8%, which are almost twice as large as what was observed by other satellites or model predictions. This feature needs further study.

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Section: Discussioncontrasting

confidence: 58%

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground‐Based Measurements

et al. 2020

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Water vapour and ozone in the upper troposphere – lower stratosphere: Global climatologies from three Canadian limb-viewing instruments

Jeffery

Walker

Sioris

et al. 2022

Preprint

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Abstract. This study presents upper troposphere – lower stratosphere (UTLS) water vapour and ozone climatologies generated from 14 years (June 2004 to May 2018) of measurements made by three Canadian limb-viewing satellite instruments: the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS), the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO), and the Optical Spectrograph and InfraRed Imaging System (OSIRIS; ozone only). This selection of instruments was chosen to explore the capability of these Canadian instruments in representing the UTLS, and to enable analysis of the impact of different measurement sampling patterns. The water vapour and ozone climatologies have been constructed using tropopause-relative potential temperature and equivalent latitude coordinates in an effort to best represent the distribution of these two gases in the UTLS, which is characterized by a high degree of dynamic and geophysical variability. Zonal-mean multiyear-mean climatologies are provided with 5° equivalent latitude and 10K potential temperature spacing, and have been constructed on a monthly, seasonal (3-month), and yearly basis. These climatologies are examined in-depth for two 3-month periods, December–January–February and June–July–August, and are compared to reference climatologies constructed from the Canadian Middle Atmosphere Model 39-year specified dynamics (CMAM39-SD) run, subsampled to the times and locations of the satellite measurements, in order to evaluate the consistency of water vapour and ozone between the datasets. Specifically, this method of using a subsampled model addresses the impact of each instrument’s measuring pattern, and allows for the quantification of the influence of different measurement patterns on multiyear climatologies. In turn, this permits a consistent evaluation of the measurements of these two gas species. For the water vapour climatologies produced, a less than 8 % overall difference was found between the climatologies generated from the two versions of ACE-FTS, while comparisons with the MAESTRO climatologies were found to yield 15–41 % overall differences, depending on the version of ACE-FTS and the season. When considering the ozone climatologies, those constructed from the two ACE-FTS 20 versions agreed to within 2 % overall, and the OSIRIS ozone climatologies agreed with these to within 10 %. The MAESTRO ozone climatologies were found to differ from ACE-FTS and OSIRIS by about 30–35 % for the former, and 25 % for the latter, albeit with regions of better agreement within the UTLS. Overall these findings indicate that this set of Canadian limb sounders provide consistent water vapour and ozone distributions in the UTLS.

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Water vapour and ozone in the upper troposphere–lower stratosphere: global climatologies from three Canadian limb-viewing instruments

et al. 2022

View full text Add to dashboard Cite

Abstract. This study presents upper troposphere–lower stratosphere (UTLS) water vapour and ozone climatologies generated from 14 years (June 2004 to May 2018) of measurements made by three Canadian limb-viewing satellite instruments: the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO), and the Optical Spectrograph and InfraRed Imaging System (OSIRIS; ozone only). This selection of instruments was chosen to explore the capability of these Canadian instruments in representing the UTLS and to enable analysis of the impact of different measurement sampling patterns. The water vapour and ozone climatologies have been constructed using tropopause-relative potential temperature and equivalent-latitude coordinates in an effort to best represent the distribution of these two gases in the UTLS, which is characterized by a high degree of dynamic and geophysical variability. Zonal-mean multiyear-mean climatologies are provided with 5∘ equivalent latitude and 10 K potential temperature spacing and have been constructed on a monthly, seasonal (3-month), and yearly basis. These climatologies are examined in-depth for two 3-month periods, December–January–February and June–July–August, and are compared to reference climatologies constructed from the Canadian Middle Atmosphere Model 39-year specified dynamics (CMAM39-SD) run, subsampled to the times and locations of the satellite measurements, in order to evaluate the consistency of water vapour and ozone between the datasets. Specifically, this method of using a subsampled model addresses the impact of each instrument's measuring pattern and allows for the quantification of the influence of different measurement patterns on multiyear climatologies. This in turn permits a more consistent evaluation of the distributions of these two gas species, as assessed through the differences between the model and measurement climatologies. For water vapour, the average absolute relative difference between CMAM39-SD and ACE-FTS differed between the two versions of ACE-FTS by less than 8 %, while the MAESTRO climatologies were found to differ by 15 %–41 % from ACE-FTS, depending on the version of ACE-FTS and the season. When considering the ozone climatologies, those constructed from the two ACE-FTS versions agreed to within 2 % overall, and the OSIRIS ozone climatologies agreed with these to within 10 %. The MAESTRO ozone climatologies differ from those from ACE-FTS and OSIRIS by 30 %–35 % and 25 %, respectively, albeit with regions of better agreement within the UTLS. These findings indicate that this set of Canadian limb sounders yields generally similar water vapour and ozone distributions in the UTLS, with some exceptions for MAESTRO depending on the season and gas species.

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Early results and Validation of SAGE III-ISS Ozone Profile Measurements from Onboard the International Space Station

Cited by 3 publications

References 17 publications

Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground‐Based Measurements

Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground‐Based Measurements

Water vapour and ozone in the upper troposphere – lower stratosphere: Global climatologies from three Canadian limb-viewing instruments

Water vapour and ozone in the upper troposphere–lower stratosphere: global climatologies from three Canadian limb-viewing instruments

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