Walter \& Lieth climatic diagram
Plot of a Walter \& Lieth climatic diagram of a station.
diagwl(dat, est="", alt=NA, per="", margen=c(4, 4, 5, 4), mlab="", pcol="#005ac8", tcol="#e81800", pfcol="#79e6e8", sfcol="#09a0d1", shem=FALSE, p3line=FALSE, ...)
dat |
Monthly climatic data for which the diagram will be plotted. |
est |
Name of the climatological station |
alt |
Altitude of the climatological station |
per |
Period on which the averages have been computed |
margen |
Margins vector for the plot (to be passed to |
mlab |
Month labels for the X axis:
|
pcol |
Color pen for precipitation. |
tcol |
Color pen for temperature. |
pfcol |
Fill color for probable frosts. |
sfcol |
Fill color for sure frosts. |
shem |
Set to |
p3line |
Set to |
... |
Other graphic parameters |
Climatic data must be passed as a 4x12 matrix of monthly (January to December) data, in the following order:
Mean precipitation
Mean maximum daily temperature
Mean minimum daily temperature
Absolute monthly minimum temperature
This last row is only used to determine the probable frost months (when absolute monthly minimums are equal or lower than 0°C).
For stations located in the southern hemisphere it is useful to set
shem=TRUE, in order to keep the summer period in the central zone of
the graphic (the diagram will begin the plot with the July data).
As described by Walter and Lieth, when monthly precipitation is greater than 100 mm, the scale is increased from 2mm/ºC to 20mm/ºC to avoid too high diagrams in very wet locations. This change is indicated by a black horizontal line, and the graph over it is filled in solid blue.
When the precipitation graph lies under the temperature graph (P < 2T) we
have an arid period (filled in dotted red vertical lines). Otherwise the
period is considered wet (filled in blue lines), unless p3line=TRUE,
that draws a precipitation black line with a scale P = 3T; in this case
the period in which 3T > P > 2T is considered semi-arid.
Daily maximum average temperature of the hottest month and daily minimum average temperature of the coldest month are frequently used in vegetation studies, and are labeled in black at the left margin of the diagram.
No value is returned by this function.
WALTER H & LIETH H (1960): Klimadiagramm Weltatlas. G. Fischer, Jena.
data(datcli) diagwl(datcli,est="Example station",alt=100,per="1961-90",mlab="en")
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