sw.depth {oce}R Documentation

Water depth

Description

Compute depth from pressure and latitude.

Usage

d <- sw.depth(ctd)
d <- sw.depth(p, lat, degrees=TRUE)

Arguments

ctd an object of class "ctd".
p Pressure [dbar]
lat Latitude in degN or radians north of the equator.
degrees Flag indicating whether degrees are used for latitude; if set to FALSE, radians are used.

Details

In the first form, the argument is a ctd object, from which the pressure and latitude are extracted and used to for the calculation.

The information given below is adapted from the fortran code at http://sam.ucsd.edu/sio210/propseawater/ppsw_fortran/ppsw.f, on which this R code was based.

Depth in meters from pressure in decibars using Saunders and Fofonoff's method, with the formula refitted for 1980 equation of state

Check value: depth = 9712.653 m for p=10000 decibars, latitude=30 deg above for standard ocean: t=0 deg. celsuis ; s=35 (ipss-78)

Value

Depth [m].

Author(s)

Dan Kelley

References

(authors), 1976, (title), Deep-Sea Res., 23, 109-111.

Examples

d <- sw.depth(10, 45);

[Package oce version 0.1.72 Index]