oce (version 0.8-3)

drag: Wind drag coefficient

Description

Wind drag coefficients for wind-profile and eddy-covariance methods, summarized in Figure 3 of Garratt (1977). The data are stored in a data frame with variables named U for wind speed in m/s, Cd for (neutral) drag coefficient i$C_D$, method for a factor with two levels: profile and eddy, for the two methods, and n, the number of data in the velocity bin.

Usage

data(drag)

source

Data digitized from Figure 3 of Garratt (1977) by Dan Kelley.

References

J. R. Garratt, 1977. Review of drag coefficients over oceans and continents. Monthly Weather Review, 105:915-927.

Examples

library(oce)
data(drag)
par(mar=c(3,3,1,1), mgp=c(2, 0.7, 0))
plot(drag$U, drag$Cd, pch=ifelse(drag$method == "profile", 1, 19),
     xlab="U [m/s]", ylab=expression(C[D]),
     xlim=c(0, 22), ylim=c(0, 3e-3))
legend("topleft", pch=c(1,19), legend=c("profile method", "eddy covariance method"))