drag | R Documentation |
drag
holds 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 four columns: U
is wind speed in m/s; Cd
is for
(neutral) drag coefficient; n
is the number of data measurements
represented by the value; and method
is a factor with two levels:
profile
and eddy
, for two methods of inferring Cd
.
data(drag, package="ocedata")
The data were digitized from Figure 3 of Garratt (1977) by Dan Kelley.
J. R. Garratt, 1977. Review of drag coefficients over oceans and continents. Monthly Weather Review, 105:915-927.
data(drag, package="ocedata") 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"))
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