WOHP (World Ocean Hydrographic Profiles) V1.0

ICDC Project



RESTRICTED only accessable in CEN/MPI net or via CliSAP login  What does that mean?

Data access via file system: /data/icdc/ocean/historical_hydrographic_data/DATA/wohp



The data-product consists of  4,081,174  temerature and salinity profiles, which were obtained by means of the bottle (Nansen) casts, CTD (Conductivity-Temperature-Depth profilers) and autonomous profiling floats. The World Ocean Database WOD2009 (update as of December 2010) (Boyer et al., 2009) served as a data basis. The first version of the data-product includes quality checked data at observed levels. Each T/S-profile can be identified via a unique ID number. For each profile the information on the ocean bottom depth is provided. The depths were taken from the high-resolution digital ocean bottom bathymetry (GEBCO). The data product is subdivided into 338 data files written in ASCII format. Each data file corresponds to a 0.5-degree geographical zone. The data can be read in using the FORTRAN program read_hydrodat.f .


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Name Unit
Depth m
Temperature °C
Salinity -

Coverage, spatial and temporal resolution

Period and temporal resolution:

  • 1804 to 2010
  • Various temporal resolution, different number of profiles of different length obtained during various measurement campaigns

Coverage and spatial resolution:

  • Global (see figure on top of page)
  • Spatial resolution: None, sampling along the cruise tracks depends on measurement campaign
  • Geographic Latitude: -90°N to 90°N
  • Geographic Longitude: 0°E to 360°E
  • Dimension: 1 column x 1 row x N measurements along the vertical profile
  • Altitude: N depths, vertical profiles


  • Data are organized in 0.5° x 0.5° grid boxes

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Data quality

The quality of the original data was assessed using several quality checks. First, the crude error check was conducted flagging the data which are grossly in error. To identify crude errors each observation was compared with the respective parameter range specified for several ocean areas. During the next check the hydrostatic stability of the density profile and the values of the vertical T/S-gradients were checked. Finally,  each observed value was compared with the mean for all data in a certain vicinity around the profile, and the difference between the observation and the mean value (measured in standard deviations) was calculated.
A detailed description of the data product is in preparation.


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Viktor Gouretski

ICDC / CEN / University of Hamburg

email: viktor.gouretski (at) uni-hamburg.de

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Data citation

In agreement with Viktor Gouretski

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