oce (version 0.9-18)

swLapseRate: Seawater lapse rate

Description

Compute adiabatic lapse rate

Usage

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

Arguments

salinity

either salinity [PSU] (in which case temperature and pressure must be provided) or a ctd object (in which case salinity, temperature and pressure ar

temperature

in-situ temperature [$^\circ$C], defined on the ITS-90 scale; see Temperature units in the documentation for swRho.

pressure

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" [1,2] or "gsw" [3,4].

Value

• Lapse rate [$deg$C/m].

Details

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

If eos="unesco", the density is calculated using the UNESCO equation of state for seawater [1,2], and if eos="gsw", the GSW formulation [3,4] is used.

References

Fofonoff, P. and R. C. Millard Jr, 1983. Algorithms for computation of fundamental properties of seawater. Unesco Technical Papers in Marine Science, 44, 53 pp. (Section 7, pages 38-40)

Examples

lr <- swLapseRate(40, 40, 10000) # 3.255976e-4