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Discussion papers
https://doi.org/10.5194/essd-2020-51
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-51
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: review article 18 Mar 2020

Submitted as: review article | 18 Mar 2020

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This preprint is currently under review for the journal ESSD.

Simplified SAGE II ozone data usage rules

Stefanie Kremser1, Larry W. Thomason2, and Leroy J. Bird1 Stefanie Kremser et al.
  • 1Bodeker Scientific, Alexandra, New Zealand
  • 2NASA Langley Research Center, Hampton, USA

Abstract. High quality satellite-based measurements are crucial to the assessment of global stratospheric composition change. The Stratospheric Aerosol and Gas Experiment II (SAGE II) provides to date the longest, continuous data set of vertically resolved ozone and aerosol extinction coefficients and therefore, remains a cornerstone of understanding and detecting long-term ozone variability and trends in the stratosphere. Despite its stability, SAGE II measurements must be screened for outliers that are a result of excessive aerosol emitted into the atmosphere and that degrade inferences of change. Current methods for SAGE II ozone measurement quality assurance consist of multiple ad-hoc, sometimes conflicting rules, leading to too much valuable data that are being removed or outliers being missed. In this work, the SAGE II ozone data set version 7.00 is used to develop and present a new set of screening recommendations and to compare the output to the screening recommendations currently used. Applying current recommendations to SAGE II ozone lead to unexpected features, such as removing ozone values around zero if the relative error is used as a screening criteria, leading to biases in monthly mean zonal mean ozone concentrations. Most of these current recommendations were developed based on "visual inspection", leading to inconsistent rules that might not be applicable at every altitude and latitude. Here, a set of new screening recommendations is presented that take into account the knowledge about how the measurements were made. The number of screening recommendations is reduced to three, which mainly remove ozone values that are affected by high aerosol loading and therefore are not reliable measurements. More data remain when applying these new recommendations compared to the rules that are currently being used, leading to more data being available for scientific studies. The SAGE II ozone data set used here is publicly available at https://doi.org/10.5281/zenodo.3710518. The complete SAGE II version 7.0 data set, which includes other variables in addition to ozone, is available at https://eosweb.larc.nasa.gov/project/sage2/sage2_v7_table, https://doi.org/10.5067/ERBS/SAGEII/SOLAR_BINARY_L2-V7.0 (SAGE II Science Team, 2012; Damadeo et al., 2013).

Stefanie Kremser et al.

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Stefanie Kremser et al.

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SAGE II version 7.0 ozone data (NetCDF) S. Kremser, L. W. Thomason, and L. J. Bird https://doi.org/10.5281/zenodo.3710518

Stefanie Kremser et al.

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Short summary
Since space-based measurements of stratospheric composition started, a plethora of "generally accepted" screening methods have been developed, tailored to each measurement system and to each anticipated use of the data. These methods are often inconsistent, ad-hoc, and untraceable and seldom revised even after significant revisions to the data themselves. Here we developed new and simplified SAGE II ozone data usage rules which are based on how the measurements were made.
Since space-based measurements of stratospheric composition started, a plethora of "generally...
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