Welcome to the CCHDO

CCHDO (CLIVAR and Carbon Hydrographic Data Office) supports oceanographic research by providing access to high quality, global, vessel-based CTD and hydrographic data from GO-SHIP, WOCE, CLIVAR and other repeat hydrography programs. These data are openly accessible and served in standardized community formats (WHP-Exchange, WOCE, and netCDF). CCHDO also manages public and non-public CTD data for use by the global Argo and OceanSITES programs.


Keyword search is provided by the search box in the upper right of the page. Other options include:

Map Search lets you draw a box on a map to search for station data.

Advanced Search lets you finely define key word, bounding box, and temporal searches.



A set of CCHDO data holdings are now available through NOAA's ERDDAP services. This popular application provides a flexible interface for evaluating and downloading CCHDO data in nearly 50 formats. A full list of the parameters available through this ERDDAP instance is available here.

It is now possible to browse and select specific profile data and with all or a subset of parameters.

You can help us improve this service by sending your comments to cchdo@ucsd.edu. We encourage feedback from novice and experienced ERDDAP users alike.

Cleaned vertical section data now available in the Java Ocean Atlas

These data consist mostly of cleaned bottle data from WOCE Hydrographic Program sections and their subsequent repeats. Sections and casts are organized, superfluous stations and data rows deleted, and errors are corrected. Data are available to download in data formats including Java OceanAtlas (JOA) binary and ASCII/CSV WHP-Exchange (widely readable by ODV, Excel, MatLab, JOA, etc.).

CF netCDF format data now Available

CCHDO has begun producing CF compliant netCDF files to improve interoperability and machine readability. These will be offered in addition to the existing formats, and will roll out over time as data are converted.

Line P data now Available

40 cruises of CTD data from Canadian Line P are now available through CCHDO. These data span the years 2007 through early 2020, and are situated off British Columbia ~125-145W and ~48-50N.

GO-SHIP Easy Ocean Data Product Now Available

CCHDO is now hosting the new GO-SHIP Easy Ocean CTDO data product (Katsumata et al. 2020). These data consist of cleaned station and objectively mapped temperature, salinity and oxygen ocean transects of more than 40 GO-SHIP sections, each with multiple repeats. Data are available to download by section, ocean basin, or globally in multiple data formats including Matlab and NetCDF.

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This material is based upon work supported by the National Science Foundation under Grant No. 1829814, and the National Oceanic and Atmospheric Administration under award NA20OAR4320278. Any opinions, findings, and conclusions or recommendations expressed in this material are those of CCHDO staff and do not necessarily reflect the views of the supporting agencies.