The mass per unit volume of a substance. Th oceanographic shorthand for density is "sigma-t".
Density is weight divided by the amount of space it occupies. Density can be expressed as kilograms per cubic meter
(mass divided by volume). For instance, if a cubic meter (~264 gallons) of seawater weighs 1025 kg (~1 ton), it has a density of 1025 kg/m
. Another way you will see density expressed is as sigma-t,
which is simply the density minus 1000. Seawater with a density of 1025 kg/m
has a sigma-t of 25. Seawater density is directly related to the salinity and temperature of seawater.
Oceanic primary productivity
Air-sea heat exchange
Microwave (1.26, 1.41 GHz)
Platforms and Sensors
|Aquarius ( launch September 2008)
||To be determined
Other sources for data