marelac (version 2.1.11)

sw_sfac: Salinity conversion factors

Description

Factors to convert from practical to absolute salinity and vice versa.

Usage

sw_sfac

Format

A list with the following:

longs

the longitude, a vector with 91 elements, range (0,360), third dimension in del_sa,

lats

the latitude, second dimension in del_sa, a vector with 44 elements, range (-82,90),

p

dbar , the first dimension in del_sa, a vector with 45 elements, range(0,6131),

ndepth

the number of depth intervals at a certain lat,long, a matrix of dimension (4,91),

del_sa

the salinity anomaly, an array with dimension (45,44,91), i.e. for (p, lats, longs) values.

Author

Karline Soetaert <[e-mail]>

References

Millero FJ, Feistel R, Wright DG and McDougall TJ, 2008. The composition of Standard Seawater and the definition of the Reference-Composition Salinity Scale, Deep-Sea Res. I, 55, 50-72.

McDougall TJ, Jackett DR and Millero FJ, 2009. An algorithm for estimating Absolute Salinity in the global ocean. Ocean Science Discussions 6, 215-242. http://www.ocean-sci-discuss.net/6/215/2009/

Uses the Fortran code written by David Jackett http://www.teos-10.org/

See Also

convert_PStoAS, to convert from practical salinity to absolute salinity

convert_AStoPS, to convert from absolute salinity to practical salinity

Examples

mf <- par(mfrow = c(2, 1))
ma <- par(mar = c(3, 5, 2, 5))

dsal <- t(sw_sfac$del_sa[1, , ])
dsal [dsal < -90] <- NA
image(sw_sfac$longs, sw_sfac$lats, dsal, col = femmecol(100),
      asp = TRUE, xlab = "dg", ylab = "dg",
      main = "salinity conversion - p = 0 bar")
contour(sw_sfac$longs, sw_sfac$lats, dsal, asp = TRUE, add = TRUE)

dsal <- t(sw_sfac$del_sa[5,,])  # 5th depth level sw_sfac$p[5]
dsal [dsal < -90]<-NA
image(sw_sfac$longs, sw_sfac$lats, dsal, col = femmecol(100),
      asp = TRUE, xlab = "dg", ylab = "dg",
      main = "salinity conversion - p = 4 bar")
contour(sw_sfac$longs, sw_sfac$lats, dsal, asp = TRUE, add = TRUE)

par("mfrow" = mf)
par("mar" = ma)