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_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 1.0-1 Index]