T68fromT90 {oce} | R Documentation |
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)
temperature |
Vector of temperatures expressed in the ITS-90 scale. |
Temperature expressed in the IPTS-68 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
,
swAbsoluteSalinity
,
swAlphaOverBeta
, swAlpha
,
swBeta
, swCSTp
,
swConservativeTemperature
,
swDepth
, swDynamicHeight
,
swLapseRate
, swN2
,
swPressure
, swRho
,
swRrho
, swSCTp
,
swSTrho
, swSigma0
,
swSigma1
, swSigma2
,
swSigma3
, swSigma4
,
swSigmaTheta
, swSigmaT
,
swSigma
, swSoundAbsorption
,
swSoundSpeed
, swSpecificHeat
,
swSpice
, swTFreeze
,
swTSrho
,
swThermalConductivity
,
swTheta
, swViscosity
,
swZ
library(oce) T68 <- seq(3, 20, 1) T90 <- T90fromT68(T68) sqrt(mean((T68-T90)^2))