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Gridded global surface measurements of nitric ozone, nitrogen dioxide, carbon monoxide and isoprene metrics data (1980-2015) - version 1.0

Update Frequency: Not Planned
Latest Data Update: 2017-05-17
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2017-06-12
Download Stats: last 12 months
Dataset Size: 80 Files | 41GB

This dataset has been superseded. See Latest Version here

This dataset represents a collation of surface measurements of nitric oxide (NO), nitrogen dioxide (NO2), carbon monoxide (CO) and isoprene (C5H8) from publicly available data sets (of hourly, daily and monthly resolutions), for the aim of improved evaluation of surface ozone in global atmospheric chemistry models.

Measurements begin in 1980 running through to 2015. The data comes in a range of formats, with a plethora of associated data quality issues, requiring substantial cleaning before being able to be utilised for model assessment. 1,033,463,750 measurements from 16,996 sites are processed through numerous data quality checks, resulting in 76,413,458 observations from 1607 sites of appropriate quality (with the majority of excluded observations due to urban influence). Observations are heavily weighted towards North America and Europe, with generally sparse coverage over the rest of the globe (with the exception of CO). See documentation for more details.

Data is provided as multiple globally gridded output files, each consisting of a series of metrics designed to reflect the distributions of the observed ozone precursor species, allowing fair and easy comparison with global models. Metrics include the moments of the distribution (i.e. mean, temporal standard deviation, skewness and kurtosis) and percentiles. A total of 80 different netCDF-4 files are produced, with metrics calculated in multiple temporal (monthly and annual) and spatial configurations (8 different resolutions), for each different species.

The format of the output netCDF-4 files is designed to be consistent with the related dataset which compiled surface ozone observations (v2.7).

Citable as:  Evans, M.J.; Bowdalo, D.R. (2017): Gridded global surface measurements of nitric ozone, nitrogen dioxide, carbon monoxide and isoprene metrics data (1980-2015) - version 1.0. Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined
Keywords: Nitric Oxide, Nitrogen Dioxide, Carbon Monoxide, Isoprene, NO, NO2, CO, C5H8, Surface, Chemistry


Previous Info:
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Previously used record identifiers:
No related previous identifiers.
Access rules:
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Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were processed by the authors and delivered to CEDA for archiving. See associated documentation for more details.

Data Quality:
Please see documentation for details of data quality
File Format:

Process overview

  • long_name: Kurtosis of gridded hourly ozone mixing ratios; zero centered (ppbv)
  • standard_name: Kurtosis_Gridded
  • var_id: Kurtosis_Gridded
  • units:
  • units: ppbv
  • long_name: Mean of gridded hourly ozone mixing ratios (ppbv)
  • standard_name: Mean_Gridded
  • var_id: Mean_Gridded
  • units: m
  • long_name: Mean site altitude (m)
  • var_id: Mean_Altitude
  • standard_name: Mean_Altitude
  • units: ppbv
  • long_name: Median (50th Percentile) of gridded hourly ozone mixing ratios (ppbv)
  • standard_name: Median_Gridded
  • var_id: Median_Gridded
  • long_name: Nitric Oxide
  • gcmd_url:
  • gcmd_keyword: Nitric Oxide
  • names: Nitric Oxide,
  • long_name: Skewness of gridded hourly ozone mixing ratios (ppbv)
  • standard_name: Skewness_Gridded
  • var_id: Skewness_Gridded
  • units:
  • long_name: metadata fields
  • var_id: meta_fields
  • standard_name: meta_fields
  • long_name: metadata parameter values
  • standard_name: meta_values
  • var_id: meta_values
  • long_name: number of sites with data in a gridbox for each time interval
  • standard_name: Count_Nsites
  • var_id: Count_Nsites
  • units:
  • long_name: range when unique measurement methodologies are applied at each respective site
  • standard_name: methods_times
  • var_id: methods_times
  • long_name: unique measurement methodologies applied at each respective site
  • standard_name: methods
  • var_id: methods

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: latitude
  • long_name: latitude
  • units: degrees_east
  • standard_name: longitude
  • var_id: longitude
  • long_name: longitude
  • long_name: time
  • standard_name: time
  • var_id: time
Temporal Range
Start time:
End time:
Geographic Extent