knitr::opts_chunk$set(collapse = TRUE, comment = "#>", fig.width = 7, fig.height = 7)
The "Orsi fronts" are a commonly used climatological map of Southern Ocean frontal distributions, once published on a Southern Ocean Atlas Database Page after Orsi et al. (1995).
The data is provided in this package as a built-in data set. The object orsifronts
is a 'SpatialLinesDataFrame' object, as defined in the 'sp' package. (A 'SpatialLinesDataFrame' is a "GIS vector" layer where complex line geometry objects are linked to simple attribute data in a table form, and it behaves like a 'data.frame').
library(orsifronts) cols <- hcl(seq(0, 240, length = nrow(orsifronts)), c = 50) plot(orsifronts, col = cols, lwd = 2) degAxis(1) degAxis(2) box()
There are r nrow(orsifronts)
line objects, with some simple names and codes.
as.data.frame(orsifronts) plot(orsifronts, xlim = c(60, 180), col = cols, asp = 1/cos(55 * pi / 180), lwd = 4) legend("topleft", sprintf("%s (%s)", orsifronts$front, orsifronts$name), col = cols, lwd = 4, cex = 0.8, bty = "n") degAxis(1) degAxis(2) box()
Similarly for the more recent Park/Durand fronts derived from altimetry remote sensing.
as.data.frame(parkfronts) pcols <- hcl(seq(0, 240, length = nrow(parkfronts)), c = 50) plot(parkfronts,col = pcols, asp = 1/cos(55 * pi / 180), lwd = 4) legend("topleft", sprintf("%s (%s)", parkfronts$front, parkfronts$name), col = cols, lwd = 4, cex = 0.8, bty = "n") degAxis(1) degAxis(2) box()
Orsi, A. H., T. Whitworth III and W. D. Nowlin, Jr. (1995). On the meridional extent and fronts of the Antarctic Circumpolar Current, Deep-Sea Research I, 42, 641-673.
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