Climate Data

Stratospheric & Tropospheric Ozone: ACC/SPARC (Atmospheric Chemistry and Climate / Stratospheric Processes and their Role in Climate)

"The AC&C/SPARC ozone database covers the period 1850 to 2100 and can be used as forcing in climate models that do not include interactive chemistry. The historical part of the AC&C/SPARC ozone database spans the period 1850 to 2009 and consists of separate stratospheric and tropospheric data sources: (1) A multiple linear regression analysis of SAGE I+II satellite observations and polar ozonesonde measurements is used for the stratospheric dataset during the well-observed period from 1979 to 2005. The regression includes terms representing equivalent effective stratospheric chlorine (EESC) and the 11-year solar cycle variability. The EESC regression coefficients are used to extrapolate that data back in time, and form a stratospheric ozone time series backward to cover the entire historical time period 1850-2006. (2) Tropospheric data are derived from the chemistry-climate models Community Atmosphere Model (CAM) version 3.5 and the NASA-GISS PUCCINI model. Both models simulate tropospheric and stratospheric chemistry with feedback to the radiation and were driven by the recently available historical (1850-2000) emissions succinctly described in Lamarque et al. (ACP, 2010)."

Key Strengths:

  • Long, infilled data set covering tropospheric and stratospheric ozone
  • Historical period data (1979-2005) from SAGE are very stable (see Randel & Wu page)

Key Limitations:

  • Highly smoothed, lacks interannual variability
  • Likely underestimates Antarctic ozone trends due to inclusion of few ozonesonde records consistently in the polar vortex

Years of Record

1850/01 to 2099/12
temporal metadataID:





Spatial Resolution

5 deg x 5 deg x 24 levels

Ocean or Land


Missing Data Flag

spatially complete

Vertical Levels

Earth system components and main variables

Suggested Data Citation

Cionni, I. et al., Ozone database in support of CMIP5 simulations: results and corresponding radiative forcing, Atmos. Chem. Phys., 11, 11267-11292, doi:10.5194/acp-11-11267-2011, 2011.

Data Access: Please Cite data sources, following the data providers' instructions.

Key Figures

Click the thumbnails to view larger sizes



Cite this page

National Center for Atmospheric Research Staff (Eds). Last modified 04 Feb 2014. "The Climate Data Guide: Stratospheric & Tropospheric Ozone: ACC/SPARC (Atmospheric Chemistry and Climate / Stratospheric Processes and their Role in Climate)." Retrieved from

Acknowledgement of any material taken from this page is appreciated. On behalf of experts who have contributed data, advice, and/or figures, please cite their work as well.