Marine Mammals Exploring the Oceans Pole to Pole

When diving animals help us to observe the oceans

Over 800,000 vertical profiles of Temperature and Salinity have been collected since 2004 in the World Ocean by attaching tags on marine mammals, such as Southern elephant seals.

In this website, you will find information about the marine mammal tagging programs, and an access point to the publicly available databases.

Please let us know if you are using our data. You can contact us by mail to if you have any question.

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Content of the website

MEOP-CTD Database: vertical profiles of temperature and salinity

Since 2004, several hundred thousands profiles of temperature and salinity have been collected by instrumented animals. The use of elephant seals has been particularly effective to sample the Southern Ocean and the North Pacific. Other seal species have been successfully used in the North Atlantic, such as hooded seals. These hydrographic data have been assembled in a quality-controlled database, the MEOP-CTD database, that can be accessed through this website.

Current version: MEOP-CTD_2024-03-08

Number of profiles: 872,119

Number of individual CTD-SRDLs: 2,086

Number of deployments: 234

To explore the database content, you can find a complete list of profiles, tags and deployments in the following files:

•  list_profiles.csv

•  list_tags.csv

•  list_deployments.csv

To download the public data, you have to fill in a simple form, asking for your name, email, who you are and what you plan to do with the data. You will then access a page with the links to the data. The MEOP-CTD, MEOP-SMS and MEOP-TDR databases can be accessed a zip file or through a read-only Dropbox folder.