R: Water pressure

swPressure {oce} | R Documentation

## Water pressure

### Description

Compute seawater pressure from depth by inverting `swDepth()` using `uniroot()`.

### Usage

    swPressure(depth, latitude = 45, eos = getOption("oceEOS", default = "gsw"))

### Arguments

`depth` | distance below the surface in metres.
`latitude` | Latitude in degN or radians north of the equator.
`eos` | indication of formulation to be used, either `"unesco"` or `"gsw"`.

### Details

If `eos="unesco"` this is done by numerical inversion of `swDepth()` is done using `uniroot()`. If `eos="gsw"`, it is done using `gsw::gsw_p_from_z()` in the gsw package.

### Value

Pressure in dbar.

### Author(s)

Dan Kelley

### References

Unesco 1983. Algorithms for computation of fundamental properties of seawater, 1983. Unesco Tech. Pap. in Mar. Sci., No. 44, 53 pp.

### See Also

Other functions that calculate seawater properties: `T68fromT90()`, `T90fromT48()`, `T90fromT68()`, `swAbsoluteSalinity()`, `swAlphaOverBeta()`, `swAlpha()`, `swBeta()`, `swCSTp()`, `swConservativeTemperature()`, `swDepth()`, `swDynamicHeight()`, `swLapseRate()`, `swN2()`, `swRho()`, `swRrho()`, `swSCTp()`, `swSTrho()`, `swSigma0()`, `swSigma1()`, `swSigma2()`, `swSigma3()`, `swSigma4()`, `swSigmaTheta()`, `swSigmaT()`, `swSigma()`, `swSoundAbsorption()`, `swSoundSpeed()`, `swSpecificHeat()`, `swSpice()`, `swTFreeze()`, `swTSrho()`, `swThermalConductivity()`, `swTheta()`, `swViscosity()`, `swZ()`

### Examples

    swPressure(9712.653, 30, eos="unesco") # 10000
    swPressure(9712.653, 30, eos="gsw")    #  9998.863

[Package oce version 1.2-0 Index]