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Download wind data from the Climate Forecast System Reanalysis (CFSR)

cfsr_dl.Rd

This function downloads hourly CFSR wind data from the NCAR THREDDS server, for one or more historic dates, within a spatial bounding box. Data for all factorial combinations of 'years', 'months', 'days', and 'hours' are downloaded and combined.

Usage

cfsr_dl(
  variable = "wnd10m",
  years = 1979,
  months = 1,
  days = 1,
  hlim = c(0, 23),
  xlim = c(260, 270),
  ylim = c(40, 50)
)

Arguments

variable

Name of the CFSR wind variable to download. Options include "wnd10m" (the default, representing wind speed 10 m above the ground), as well as "wnd1000", "wnd850", "wnd700", "wnd500", and "wnd200" (representing higher altitudes, with the numbers indicating pressure levels in hPa).

years

Integer vector representing the historic year(s) for which data are to be accessed, in the range 1979-2010.

months

Integer vector representing the month(s) for which data are to be accessed, in the range 1-12.

days

Integer vector representing day(s) for which data is to be requested, in the range 0-31.

hlim

Vector of length 2, containing integers between 0 and 23, giving the range of hours (in UTC time zone) to download.

xlim

Vector of length 2, giving longitudinal limits of the data to download, in the range 0 to 360.

ylim

Vector of length 2, giving latitudinal limits of the data to download, in the range -90 to 90.

Value

A list containing u and v components of the wind field, each as a SpatRaster with a layer for each hour of each requested date.