The Expendable Bathythermograph (XBT) is an in situ probe that measures temperature throughout the water column. XBTs are deployed into the ocean from vessels and provide temperature profiles to depths up to 1800 meters. Water depth can also be calculated due to the XBTs having a set fall rate. NOAA, in collaboration with other agencies, monitors a network of XBTs that are deployed along fixed routes or transects to allow for global monitoring of ocean temperatures

Instrument Details
- Temperature/Humidity
- Earth Science > Oceans > Ocean Temperature > Water TemperatureEarth Science > Oceans > Ocean TemperatureEarth Science > Oceans > Ocean Temperature > Sea Surface Temperature
- Subsurface - Sea/Ocean/Water
- Variable
- Variable
- N/A
- Currently unavailble
Currently unavailable
Currently unavailable
Varies
Currently unavailable
Currently unavailable
data center outside NASA
- Physical Oceanography DAAC (PO.DAAC)
![]() R/V Roger Revelle 2 Campaigns · 15 Instruments | SPURS Salinity Processes in the Upper Ocean Regional Study 2012—2017 Subtropical North Atlantic Ocean, Tropical Eastern Pacific Ocean 2 Deployments · 41 Data Products
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