swDepth: Water depth

In oce: Analysis of Oceanographic Data

Water depth

Description

Compute depth below the surface (i.e. a positive number within the water column) based on pressure and latitude. (Use swZ() to get the vertical coordinate, which is negative within the water column.)

Usage

swDepth(pressure, latitude = 45, eos = getOption("oceEOS", default = "gsw"))

Arguments

pressure	either pressure (dbar), in which case lat must also be given, or a ctd object, in which case lat will be inferred from the object.
latitude	Latitude in ^\circN.
eos	indication of formulation to be used, either "unesco" or "gsw".

Details

If eos="unesco" then depth is calculated from pressure using Saunders and Fofonoff's method, with the formula refitted for 1980 UNESCO equation of state (reference 1). If eos="gsw", then gsw::gsw_z_from_p() from the gsw package (references 2 and 3) is used.

Value

Depth below the ocean surface, in metres.

Author(s)

Dan Kelley

References

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

2. IOC, SCOR, and IAPSO (2010). The international thermodynamic equation of seawater-2010: Calculation and use of thermodynamic properties. Technical Report 56, Intergovernmental Oceanographic Commission, Manuals and Guide.

3. McDougall, T.J. and P.M. Barker, 2011: Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox, 28pp., SCOR/IAPSO WG127, ISBN 978-0-646-55621-5.

See Also

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

Examples

d <- swDepth(10, 45)

oce documentation built on July 9, 2023, 5:18 p.m.