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Volume 8, issue 1
Earth Syst. Sci. Data, 8, 41-59, 2016
https://doi.org/10.5194/essd-8-41-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Earth Syst. Sci. Data, 8, 41-59, 2016
https://doi.org/10.5194/essd-8-41-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

  11 Feb 2016

11 Feb 2016

Gridded global surface ozone metrics for atmospheric chemistry model evaluation

E. D. Sofen1, D. Bowdalo1, M. J. Evans1,2, F. Apadula3, P. Bonasoni4, M. Cupeiro5, R. Ellul6, I. E. Galbally7, R. Girgzdiene8, S. Luppo9, M. Mimouni10, A. C. Nahas11, M. Saliba6, and K. Tørseth12 E. D. Sofen et al.
  • 1Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
  • 2National Centre for Atmospheric Sciences, University of York, Heslington, York, YO10 5DD, UK
  • 3Ricerca sul Sistema Energetico – RSE, via R. Rubattino 54, 20134, Milan, Italy
  • 4Institute of Atmospheric Sciences and Climate, Italian National Research Council (ISAC-CNR), Bologna, Italy
  • 5Servicio Meteorológico Nacional, Ushuaia GAW Station, Tierra del Fuego, Argentina
  • 6Department of Geosciences, University of Malta, Msida MSD 2080, Malta
  • 7CSIRO Oceans and Atmosphere Flagship, Aspendale Vic. 3195, Australia
  • 8State Research Institute Center for Physical Sciences and Technology, Savanorių ave. 231, 02300 Vilnius, Lithuania
  • 9Universidad Nacional de Tierra del Fuego, ICPA, Tierra del Fuego, Argentina
  • 10Algerian Meteorology Service, P.O. Box 31, Tamanrasset, Algeria
  • 11Global Atmosphere Watch (GAW) Station Bukit Kototabang, The Indonesian Agency for Meteorological, Climatological, and Geophysics (BMKG), Jl. Raya Bukittinggi – Medan Km. 17 Palupuh, Agam, West Sumatera, Indonesia
  • 12NILU – Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway

Abstract. The concentration of ozone at the Earth's surface is measured at many locations across the globe for the purposes of air quality monitoring and atmospheric chemistry research. We have brought together all publicly available surface ozone observations from online databases from the modern era to build a consistent data set for the evaluation of chemical transport and chemistry-climate (Earth System) models for projects such as the Chemistry-Climate Model Initiative and Aer-Chem-MIP. From a total data set of approximately 6600 sites and 500 million hourly observations from 1971–2015, approximately 2200 sites and 200 million hourly observations pass screening as high-quality sites in regionally representative locations that are appropriate for use in global model evaluation. There is generally good data volume since the start of air quality monitoring networks in 1990 through 2013. Ozone observations are biased heavily toward North America and Europe with sparse coverage over the rest of the globe. This data set is made available for the purposes of model evaluation as a set of gridded metrics intended to describe the distribution of ozone concentrations on monthly and annual timescales. Metrics include the moments of the distribution, percentiles, maximum daily 8-hour average (MDA8), sum of means over 35ppb (daily maximum 8-h; SOMO35), accumulated ozone exposure above a threshold of 40ppbv (AOT40), and metrics related to air quality regulatory thresholds. Gridded data sets are stored as netCDF-4 files and are available to download from the British Atmospheric Data Centre (doi:10.5285/08fbe63d-fa6d-4a7a-b952-5932e3ab0452). We provide recommendations to the ozone measurement community regarding improving metadata reporting to simplify ongoing and future efforts in working with ozone data from disparate networks in a consistent manner.

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We have brought together all publicly available surface ozone observations from online databases from 1971–2015, with 2200 sites representing regional background conditions appropriate for the evaluation of chemical transport and chemistry-climate models for projects such as the Chemistry-Climate Model Initiative. Gridded data sets of ozone metrics (mean, percentiles, MDA8, SOMO35, etc.) are available from the British Atmospheric Data Centre.
We have brought together all publicly available surface ozone observations from online databases...
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