swDepth {oce}R Documentation

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 degN or radians north of the equator.

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

Value

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

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.

Examples

d <- swDepth(10, 45)

[Package oce version 0.9-18 Index]