oce (version 0.9-18)

swDepth: Water depth

Description

Compute depth from pressure and latitude.

Usage

swDepth(pressure, latitude=45, eos=getOption("oceEOS", default="gsw"))
swZ(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 $^\circ$N or radians north of the equator.

eos

indication of formulation to be used, either "unesco" or "gsw".

Value

• For swDepth, depth below the ocean surface, in metres. For swZ, the negative of the depth, i.e. the distance above the surface.

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 [1]. If eos="gsw", then gsw_z_from_p from the gsw package [2,3] is used.

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.

Examples

d <- swDepth(10, 45)