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Discussion papers | Copyright
https://doi.org/10.5194/os-2018-34
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Apr 2018

Research article | 06 Apr 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

WOCE-Argo Global Hydrographic Climatology

Viktor Gouretski Viktor Gouretski
  • Integrated Climate Data Center, Center for Earth System Research and Sustainablity, The University of Hamburg, Grindelberg 5, 20144 Hamburg, Germany

Abstract. The paper describes the new gridded WOCE-Argo Global Hydrographic Climatology (WAGHC) (Gouretski, 2018). The climatology has a one-fourth degree spatial resolution resolving the annual cycle of temperature and salinity on a monthly basis. Two versions of the climatology were produced differing by the spatial interpolation performed on isobaric or isopycnal surfaces respectively. The WAGHC climatology is based on the quality controlled temperature and salinity profiles obtained before January 2016 with the average climatological year being in the range 2008 to 2012.

To avoid biases due to the significant step-like decrease of the data below 2km the profile extrapolation procedure is implemented. We compare the WAGHC climatology to the one-fourth degree resolution isobarically averaged climatology WOA13, produced by the NOAA Ocean Climate Laboratory (Boyer et al., 2013) and diagnose a generally good agreement between these two gridded products. The differences between the two climatologies are attributed basically to the interpolation method and to the considerably extended data basis. Specifically, the WAGHC climatology improved the representation of the thermohaline structure both in the data poor polar regions and in several data abundant regions like the Baltic sea, Caspian sea, Gulf of California, Caribbean Sea, and the Weddell Sea. Further, the dependence of the ocean heat content anomaly (OHCA) time series on the baseline climatology was tested. Since the 1950s, the both baseline climatologies produce almost identical OHCA time series.

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Viktor Gouretski
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Viktor Gouretski
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The new gridded WOCE-Argo Global Hydrographic Climatology (WAGHC) is described and compared with the NOAA WOA13 Atlas. The monthly fields of temperature and salinity for 65 depth levels have a 1/4 degree spatial resolution. Two versions of the climatology were produced differing by the spatial interpolation performed on isobaric or isopycnal surfaces respectively. The climatology characterizes the thermohaline state of the World Ocean for the time period 2008 to 2012.
The new gridded WOCE-Argo Global Hydrographic Climatology (WAGHC) is described and compared with...
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