An evaluation of the SAGE III version 4 aerosol extinction coefficient and water vapor data products

Thomason, L. W.; Moore, James; Pitts, Mıchael; Zawodny, J. M.; Chiou, E. W.

doi:10.5194/acp-10-2159-2010

Cited by 68 publications

(85 citation statements)

References 26 publications

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“…It should be noted that the aerosol data at 386 nm are biased low below 20 km and above the main aerosol layer and are at best of limited quality under all conditions and altitudes. Following Thomason et al (2010), while the data is included in the data set, we 35 recommend caution using SAGE II 386-nm data. Finally, we exclude any data below the highest altitude at which 1020 nm aerosol extinction coefficient exceeds 0.01 km -1 because of potential artifacts in SAGE II data at altitudes where the atmosphere is essentially opaque.…”

Section: The Sage II Era Data Set (October 1984 To August 2005)mentioning

confidence: 99%

A global, space-based stratospheric aerosol climatology: 1979 to 2016

Thomason¹,

Vernier²,

Bourassa³

et al. 2017

Preprint

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We describe the construction of a continuous 38-year record of stratospheric aerosol optical properties. The Global Space-based Stratospheric Aerosol Climatology, or GloSSAC, provided the input data to the 15 construction of the Climate Model Intercomparison Project stratospheric aerosol forcing data set (1979 to 2014) and we have extended it through 2016 following an identical process. GloSSAC focuses on the Stratospheric Aerosol and Gas Experiment (SAGE) series of instruments through mid-2005 and on the Optical Spectrograph and InfraRed Imager System (OSIRIS) and the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data thereafter. We also use data from other space 20 instruments and from ground-based, air and balloon borne instruments to fill in key gaps in the data set. The end result is a global and gap-free data set focused on aerosol extinction coefficient at 525 and 1020 nm and other parameters on an 'as available' basis. For the primary data sets, we developed a new method for filling the post-Pinatubo eruption data gap for 1991 to 1993 based on data from the Cryogenic Limb Array Etalon Spectrometer. In addition, we developed a new method for populating wintertime high 25 latitudes during the SAGE period employing a latitude-equivalent latitude conversion process that greatly improves the depiction of aerosol at high latitudes compared to earlier similar efforts. We report data in the troposphere only when and where it is available. This is primarily during the SAGE II period except the most enhanced part of the Pinatubo period. It is likely that the upper troposphere during Pinatubo was greatly enhanced over non-volcanic periods and that domain remains substantially under characterized. 30We note that aerosol levels during the OSIRIS/CALIPSO period in the lower stratosphere at mid and high latitudes is routinely higher than what we observed during the SAGE II period. While this period had nearly continuous low-level volcanic activity, it is possible that the enhancement in part reflects deficiencies in the data set. We also expended substantial effort to quality assess the data set and the product is by far the best we have produced. GloSSAC version 1.0 is available in netCDF format at the NASA Atmospheric 35 Data Center at https://eosweb.larc.nasa.gov/. GloSSAC users should cite this paper and the data set DOI

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Section: The Sage II Era Data Set (October 1984 To August 2005)mentioning

confidence: 99%

A global, space-based stratospheric aerosol climatology: 1979 to 2016

Thomason¹,

Vernier²,

Bourassa³

et al. 2017

Preprint

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“…In version 6.2, they were derived from the Shettle and Anderson cross-section compilation (Shettle and Anderson, 1995), which is the same cross-section compilation that was used in SAGE III version 3.0. In SAGE III version 4.0 (Thomason et al, 2010), however, the O 3 crosssections were updated to the Bogumil (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) V3) cross-sections (Bogumil et al, 2003), which had a positive impact on several data products and produced better agreement with in-atmosphere measurements (Pitts et al, 2006). As such, SAGE II version 7.0 uses the SCIAMACHY V3 O 3 cross-sections, including companion measurements of NO 2 absorption cross-sections encompassing SAGE II measurement wavelengths (Fig.…”

Section: Spectroscopymentioning

confidence: 99%

SAGE version 7.0 algorithm: application to SAGE II

et al. 2013

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Abstract. This paper details the SAGE (Stratospheric Aerosol and Gas Experiment) version 7.0 algorithm and how it is applied to SAGE II. Changes made between the previous (v6.2) and current (v7.0) versions are described and their impacts on the data products explained for both coincident event comparisons and time-series analysis. Users of the data will notice a general improvement in all of the SAGE II data products, which are now in better agreement with more modern data sets (e.g., SAGE III) and more robust for use with trend studies.

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“…SAGE III was launched on the Meteor 3M platform into a polar orbit, performing occultations in the mid-to polar latitudes. With an accuracy and precision of the order of 10 %, and a channel at 755 nm, SAGE III provides an excellent data set for comparison (Thomason et al, 2010). Bourassa et al (2012) compared the version 5.07 algorithm with coincident SAGE III measurements using a coincident criterion of ±6 h, ±1 • latitude and ±2.5 • longitude.…”

Section: Sage III Recomparisonmentioning

confidence: 99%

Stratospheric aerosol particle size information in Odin-OSIRIS limb scatter spectra

2014

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Abstract. The Optical Spectrograph and InfraRed Imaging System (OSIRIS) onboard the Odin satellite has now taken over a decade of limb scatter measurements that have been used to retrieve the version 5 stratospheric aerosol extinction product. This product is retrieved using a representative particle size distribution to calculate scattering cross sections and scattering phase functions for the forward model calculations. In this work the information content of OSIRIS measurements with respect to stratospheric aerosol is systematically examined for the purpose of retrieving particle size information along with the extinction coefficient. The benefit of using measurements at different wavelengths and scattering angles in the retrieval is studied, and it is found that incorporation of the 1530 nm radiance measurement is key for a robust retrieval of particle size information. It is also found that using OSIRIS measurements at the different solar geometries available on the Odin orbit simultaneously provides little additional benefit. Based on these results, an improved aerosol retrieval algorithm is developed that couples the retrieval of aerosol extinction and mode radius of a log-normal particle size distribution. Comparison of these results with coincident measurements from SAGE III shows agreement in retrieved extinction to within approximately 10 % over the bulk of the aerosol layer, which is comparable to version 5. The retrieved particle size, when converted to Ångström coefficient, shows good qualitative agreement with SAGE II measurements made at somewhat shorter wavelengths.

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An evaluation of the SAGE III version 4 aerosol extinction coefficient and water vapor data products

Cited by 68 publications

References 26 publications

A global, space-based stratospheric aerosol climatology: 1979 to 2016

A global, space-based stratospheric aerosol climatology: 1979 to 2016

SAGE version 7.0 algorithm: application to SAGE II

Stratospheric aerosol particle size information in Odin-OSIRIS limb scatter spectra

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