The diurnal variation in stratospheric ozone from the MACC reanalysis, the ERA-Interim reanalysis, WACCM and Earth observation data: characteristics and intercomparison
- 1Institute of Applied Physics and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
- 2Belgium Institute of Space Aeronomy, Brussels, Belgium
- 3ECMWF, Reading, UK
- 4Institute of Environmental Physics, Universität Bremen, Bremen, Germany
- 5Contractor to BC Scientific, Consulting LLC, USA
- 6Department of Astronomy, University of Massachusetts, Amherst, MA, USA
- 7Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Tokyo, Japan
Abstract. In this study we compare the diurnal variation in stratospheric ozone derived from free-running simulations of the Whole Atmosphere Community Climate Model (WACCM) and from reanalysis data of the atmospheric service MACC (Monitoring Atmospheric Composition and Climate) which both use a similar stratospheric chemistry module. We find good agreement between WACCM and the MACC reanalysis for the diurnal ozone variation in the high-latitude summer stratosphere based on photochemistry. In addition, we consult the ozone data product of the ERA-Interim reanalysis. The ERA-Interim reanalysis ozone system with its long-term ozone parametrization can not capture these diurnal variations in the upper stratosphere that are due to photochemistry. The good dynamics representations, however, reflects well dynamically induced ozone variations in the lower stratosphere. For the high-latitude winter stratosphere we describe a novel feature of diurnal variation in ozone where changes of up to 46.6% (3.3 ppmv) occur in monthly mean data. For this effect good agreement between the ERA-Interim reanalysis and the MACC reanalysis suggest quite similar diurnal advection processes of ozone. The free-running WACCM model seriously underestimates the role of diurnal advection processes at the polar vortex at the two tested resolutions. The intercomparison of the MACC reanalysis and the ERA-Interim reanalysis demonstrates how global reanalyses can benefit from a chemical representation held by a chemical transport model. The MACC reanalysis provides an unprecedented description of the dynamics and photochemistry of the diurnal variation of stratospheric ozone which is of high interest for ozone trend analysis and research on atmospheric tides. We confirm the diurnal variation in ozone at 5 hPa by observations of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) experiment and selected sites of the Network for Detection of Atmospheric Composition Change (NDACC). The latter give valuable insight even to diurnal variation of ozone in the polar winter stratosphere.
A. Schanz et al.
A. Schanz et al.
A. Schanz et al.
3 citations as recorded by crossref.
- Model-based climatology of diurnal variability in stratospheric ozone as a data analysis tool S. Frith et al. 10.5194/amt-13-2733-2020
- The Diurnal Variation in Stratospheric Ozone from MACC Reanalysis, ERA-Interim, WACCM, and Earth Observation Data: Characteristics and Intercomparison A. Schanz et al. 10.3390/atmos12050625
- Diurnal variation in middle-atmospheric ozone observed by ground-based microwave radiometry at Ny-Ålesund over 1 year F. Schranz et al. 10.5194/acp-18-4113-2018