| T68fromT90 {oce} | R Documentation |
Convert From ITS-90 to IPTS-68 Temperature
Description
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.
Usage
T68fromT90(temperature)
Arguments
temperature |
numeric vector of temperatures]in |
Value
Corresponding temperatures in ^\circC on the IPTS-68 scale.
Author(s)
Dan Kelley
References
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
See Also
Other functions that calculate seawater properties:
T90fromT48(),
T90fromT68(),
computableWaterProperties(),
locationForGsw(),
swAbsoluteSalinity(),
swAlphaOverBeta(),
swAlpha(),
swBeta(),
swCSTp(),
swConservativeTemperature(),
swDepth(),
swDynamicHeight(),
swLapseRate(),
swN2(),
swPressure(),
swRho(),
swRrho(),
swSCTp(),
swSR(),
swSTrho(),
swSigma0(),
swSigma1(),
swSigma2(),
swSigma3(),
swSigma4(),
swSigmaTheta(),
swSigmaT(),
swSigma(),
swSoundAbsorption(),
swSoundSpeed(),
swSpecificHeat(),
swSpice(),
swSstar(),
swTFreeze(),
swTSrho(),
swThermalConductivity(),
swTheta(),
swViscosity(),
swZ()
Examples
library(oce)
T68 <- seq(3, 20, 1)
T90 <- T90fromT68(T68)
sqrt(mean((T68-T90)^2))