Today's instruments typically record in the ITS-90 scale, but some old
datasets will be in the IPTS-68 scale. T90fromT68()
converts from the
IPTS-68 to the ITS-90 scale, using Saunders' (1990) formula, while
T68fromT90()
does the reverse. The difference between IPTS-68 and
ITS-90 values is typically a few millidegrees (see ‘Examples’), which
is seldom visible on a typical temperature profile, but may be of interest
in some precise work. Mostly for historical interest, T90fromT48()
is provided to convert from the ITS-48 system to ITS-90.
T68fromT90(temperature)
Corresponding temperatures in \(^\circ\)C on the IPTS-68 scale.
numeric vector of temperatures]in \(^\circ\)C on the ITS-90 scale.
Dan Kelley
P. M. Saunders, 1990. The international temperature scale of 1990, ITS-90. WOCE Newsletter, volume 10, September 1990, page 10. http://www.nodc.noaa.gov/woce/wdiu/wocedocs/newsltr/news10/contents.htm
Other functions that calculate seawater properties:
T90fromT48()
,
T90fromT68()
,
computableWaterProperties()
,
locationForGsw()
,
swAbsoluteSalinity()
,
swAlpha()
,
swAlphaOverBeta()
,
swBeta()
,
swCSTp()
,
swConservativeTemperature()
,
swDepth()
,
swDynamicHeight()
,
swLapseRate()
,
swN2()
,
swPressure()
,
swRho()
,
swRrho()
,
swSCTp()
,
swSR()
,
swSTrho()
,
swSigma()
,
swSigma0()
,
swSigma1()
,
swSigma2()
,
swSigma3()
,
swSigma4()
,
swSigmaT()
,
swSigmaTheta()
,
swSoundAbsorption()
,
swSoundSpeed()
,
swSpecificHeat()
,
swSpice()
,
swSpiciness0()
,
swSpiciness1()
,
swSpiciness2()
,
swSstar()
,
swTFreeze()
,
swTSrho()
,
swThermalConductivity()
,
swTheta()
,
swViscosity()
,
swZ()
library(oce)
T68 <- seq(3, 20, 1)
T90 <- T90fromT68(T68)
sqrt(mean((T68-T90)^2))
Run the code above in your browser using DataLab