https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/01cc0beb-7c9a-40ed-ad86-0661b41aee53 CTD A Conductivity, Temperature, Depth (CTD) is an electronicinstrument package that accurately reports conductivity,temperature and depth and transmits data up the conducting wireto a computer on board. The computer calculates salinity fromconductivity and temperature. Together, salinity and temperaturedetermine the density of seawater, which in turn affects itsmovements; and temperature affects biological rates andbehavior.Additional information available at'http://octopus.gma.org/onlocation/ctd.html'[Summary provided by Gulf of Maine Aquarium]