oce (version 0.8-6)

ptPatm: Estimate atmospheric pressure in pt record

Description

Estimate atmospheric pressure in pt record

Usage

ptPatm(x, dp=0.5)

Arguments

x

A pt object, or a list of pressures (in decibars).

dp

Half-width of pressure window to be examined (in decibars).

Value

• A list of four estimates: sap, the median, the mean, and the weighted mean.

Details

Pressures must be in decibars for this to work. First, a subset of pressures is created, in which the range is sap-dp to sap+dp. Here, sap=10.1325 dbar is standard sealevel atmospheric pressure. Within this window, three measures of central tendency are calculated: the median, the mean, and a weighted mean that has weight given by $exp(-2*((p - sap) / dp)^2)$.

See Also

The documentation for pt-class explains the structure of PT objects, and also outlines the other functions dealing with them.

Examples

library(oce)
data(ptr)
print(ptPatm(ptr))