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The World Ocean Database was first released in 1994<ref>{{cite web |url=http://www.nodc.noaa.gov/OC5/indpub.html#World%20Ocean%20Atlas%201994 |title=World Ocean Atlas 1994 series |publisher=[[National Oceanographic Data Center]]}}</ref> and updates have been released approximately every four years, 1998,<ref>{{cite web |url=http://www.nodc.noaa.gov/OC5/indpub.html#World%20Ocean%20Atlas%201998 |title=World Ocean Atlas 1998 series |publisher=[[National Oceanographic Data Center]]}}</ref> 2001,<ref>{{cite web |url=http://www.nodc.noaa.gov/OC5/WOA01/pr_woa01.html |title=World Ocean Atlas 2001 |publisher=[[National Oceanographic Data Center]]}}</ref> and 2005.<ref>{{cite web |url=http://www.nodc.noaa.gov/OC5/WOA05/pr_woa05.html |title=World Ocean Atlas 2005 |publisher=[[National Oceanographic Data Center]]}}</ref> The most recent World Ocean Database series, WOD09, was released in September 2009.<ref>{{cite web |url=http://www.nodc.noaa.gov/OC5/WOA09/pr_woa09.html |title=World Ocean Atlas 2009 |publisher=[[National Oceanographic Data Center]]}}</ref> The WOD09 has more than 9 million temperature profiles and 3.6 million salinity profiles. The table shows a comparison of the number of stations by instrument type in WOD09 with previous NODC/WDC global ocean databases.
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! Instrument Type !! NODC (1974)<ref>Based on statistics from Levitus, S. (1982) ''[ftp://ftp.nodc.noaa.gov/pub/data.nodc/woa/PUBLICATIONS/levitus_atlas_1982.pdf Climatological Atlas of the World Ocean]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }}'', [[NOAA]] Professional Paper No. 13, pp. 191</ref> !! NODC (1991)<ref>Based on NODC Temperature Profile CD-ROM</ref> !! WOA94 !! WOD98 !! WOD01 !! WOD05 !! WOD09
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| SUR <ref>Surface data are represented differently than profile data in WOD09 – all observations in a single cruise are combined into one “station” with zero depth, values of measured variables along with latitude, longitude, and Julian year-day to identify and locate individual sets of observations</ref> || na || na || na || na || 4,743 || 9,178 || 9,178
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==Instrument Types==
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