oce (version 0.9-17)

swBeta: Seawater haline contraction coefficient

Description

Compute $\beta$, the haline contraction coefficient for seawater.

Usage

swBeta(salinity, temperature=NULL, pressure=0,
       longitude=300, latitude=30, eos=getOption("oceEOS", default="gsw"))

Arguments

salinity

either practial salinity (in which case temperature and pressure must be provided) or an oce object (in which case salinity, etc. are inferred from the object).

temperature

in-situ temperature [$^\circ$C]

pressure

seawater pressure [dbar]

longitude

longitude of observation (only used if eos="gsw"; see Details).

latitude

latitude of observation (only used if eos="gsw"; see Details).

eos

equation of state, either "unesco" or "gsw".

Value

• Value in 1/psu.

Details

If the first argument is a ctd object, then salinity, temperature and pressure values are extracted from it, and used for the calculation.

References

The eos="unesco" formulae are based on the UNESCO equation of state, but are formulaed empirically by Trevor J. McDougall, 1987, Neutral Surfaces, Journal of Physical Oceanography, volume 17, pages 1950-1964. The eos="gsw" formulae come from GSW; see references in the swRho documentation.

Examples

swBeta(40, 10, 4000, eos="unesco")