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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-580
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-580
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Jul 2020

29 Jul 2020

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A revised version of this preprint is currently under review for the journal ACP.

Validation of reanalysis Southern Ocean atmosphere trends using sea ice data

William R. Hobbs1,2, Andrew R. Klekociuk1,3, and Yuhang Pan4 William R. Hobbs et al.
  • 1Australian Antarctic Program Partnership, Institute of Marine and Antarctic Studies, Private Bag 129, University of Tasmania, Hobart, TAS 7001, Australia
  • 2ARC Centre of Excellence for Climate Extremes, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, Australia
  • 3Antarctica and the Global System Program, Australian Antarctic Division, 203 Channel Highway, Kingston, TAS 7050, Australia
  • 4independent researcher

Abstract. Reanalysis products are an invaluable tool for representing variability and long-term trends in regions with limited in-situ data, and especially the Antarctic. A comparison of 8 different reanalysis products shows large differences sea level pressure and surface air temperature trends over the high latitude Southern Ocean, with implications for studies of the atmosphere's role in driving ocean-sea ice changes. In this study, we use the established close coupling between sea ice cover and surface temperature to evaluate these reanalysis trends using the independent, 30-year sea ice record from 1980–2010. We demonstrate that sea ice trends are a reliable validation tool for most months of the year, although the sea ice-surface temperature coupling is weakest in summer when the surface energy budget is dominated by atmosphere-to-ocean heat fluxes. Based on our analysis, we find that surface air temperature trends in JRA55 are most consistent with satellite-observed sea ice trends over the polar waters of the Southern Ocean.

William R. Hobbs et al.

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William R. Hobbs et al.

William R. Hobbs et al.

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Latest update: 21 Oct 2020
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Short summary
Reanalysis products are an invaluable tool for representing variability and long-term trends in regions with limited in-situ data. However, validation of these products is difficult because of that lack of station data. Here we present a novel assessment of eight reanalyses over the polar Southern Ocean, leveraging the close relationship between trends in sea ice cover and surface air temperature, that provides clear guidance the most reliable product for Antarctic research.
Reanalysis products are an invaluable tool for representing variability and long-term trends in...
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