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.


A16N Leg 1 Preliminary Data

The preliminary data from the A16N Leg 1 cruise is now available for download under "Unmerged Data as Received" here.


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.


The 2022 occupation of US GO-SHIP P02 was conducted in the North Pacific Ocean from 30 April - 16 July. A total of 241 rosette/CTD/LADCP stations were occupied on a zonal transect running approximately along latitude 30N. Measurements include reference quality CTDO casts with bottle sampling for salinity, oxygen, nutrients, a host of carbon parameters, and CFCs.

Data files in standard CCHDO formats can be accessed here:

Congratulations to the crew and science party for this successful campaign.

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.).

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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.