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The U.S. National Oceanic and Atmospheric Administration's (NOAA) World Ocean Database 2009, released in November as an update to the 2005 version, provides about 9.1 million temperature profiles and 3.5 million salinity reports, with some information dating as far back as 1800. The updated database includes scientific information about the oceans that can be sorted in various ways, including geographically or by year. “There is now more data about the global oceans than ever before,” according to Sydney Levitus, director of the World Data Center for Oceanography, part of NOAA's National Oceanographic Data Center. “Previous databases have shown the world ocean has warmed during the last 53 years, and it's crucial we have reliable, accurate monitoring of our oceans into the future,” he said. The database is a part of the Integrated Ocean Observing System and the Global Earth Observation System of Systems.
Randy Showstack (Tue,) studied this question.