T90fromT68 {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.
T90fromT48(temperature) T90fromT68(temperature) T68fromT90(temperature)
temperature |
expressed in one scale |
Temperature expressed in the second scale
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)
library(oce) T68 <- seq(3, 20, 1) T90 <- T90fromT68(T68) sqrt(mean((T68-T90)^2))