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Discussion papers
https://doi.org/10.5194/acp-2018-1280
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1280
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Feb 2019

Research article | 05 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Deriving tropospheric ozone from assimilated profiles

Jacob C. A. van Peet1,a and Ronald J. van der A1,2 Jacob C. A. van Peet and Ronald J. van der A
  • 1Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
  • 2Nanjing University of Information Science & Technology (NUIST), Nanjing, China
  • acurrently at: Free University, Amsterdam, the Netherlands

Abstract. To derive global tropospheric O3 columns from satellite observations, O3 profiles retrieved from GOME-2A and OMI measurements were simultaneously assimilated into the TM5 global chemistry transport model for the year 2008. The horizontal model resolution has been increased by a factor of 6 for more accurate results, but to reduce computational cost, the number of model layers has been reduced from 44 to 31. The model ozone fields are used to derive tropospheric ozone, which is defined here as the partial column between mean sea level and 6 km altitude. Two methods for calculating the tropospheric columns from the free model run and assimilate O3 fields are compared. In the first method, we calculate the residual between assimilated total columns and the partial model column between 6 km and the top of atmosphere. In the second method, we perform a direct integration of the assimilated O3 fields between the surface and 6 km. The results are validated against tropospheric columns derived from ozone sonde measurements. It turned out that the residual method has a too large variation to be used reliably for the determination of tropospheric ozone, so the direct integration method has been used instead. The median global bias is smaller for the assimilated O3 fields than for the free model run, but the large variation makes it difficult to make definitive statements on a regional or local scale. The monthly mean ozone fields show significant improvements and more detail when comparing the assimilated O3 fields with the free model run, especially for features such as biomass burning enhanced O3 concentrations and outflow of O3 rich air from Asia over the Pacific.

Jacob C. A. van Peet and Ronald J. van der A
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Jacob C. A. van Peet and Ronald J. van der A
Jacob C. A. van Peet and Ronald J. van der A
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Short summary
In this research, we combine satellite measurements of ozone with a chemical transport model of the atmosphere. The focus is on the ozone concentration between the surface and 6 km above mean sea level, since in that altitude range ozone has the highest impact on living organisms. Monthly mean ozone fields show significant improvements and more detail, especially for features such as biomass burning enhanced ozone concentrations and outflow of ozone rich air from Asia over the Pacific.
In this research, we combine satellite measurements of ozone with a chemical transport model of...
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