Read gridded LPJmL-forcing windspeed onto WHEP's grid.

Reads the GSWP3-W5E5 monthly windspeed forcing used to drive LPJmL (single consolidated NetCDF, already on WHEP's native 0.5-degree grid) and returns it in tidy long form. The file's wind variable carries no units attribute, because the monthly aggregation dropped it; the unit is metres per second, taken from the ISIMIP2a GSWP3-W5E5 daily source the file is derived from, which declares units = "m s-1" and standard_name = "wind_speed". That is why the output column is named windspeed_ms.

Usage

read_lpjml_wind(years = NULL, wind_dir = NULL, example = FALSE)

Arguments

years: Optional integer vector of calendar years to keep. NULL reads every year present in the file (1901-2016).
wind_dir: Path to the directory holding wind_gswp3-w5e5_1901_2016_monthly.nc. Defaults to Sys.getenv("WHEP_WIND_DIR").
example: If TRUE, return a small fixture instead of reading data. Defaults to FALSE.

Value

A tibble with lon, lat, year, month, windspeed_ms.

Examples

read_lpjml_wind(example = TRUE)
#> # A tibble: 1 × 5
#>     lon   lat  year month windspeed_ms
#>   <dbl> <dbl> <int> <int>        <dbl>
#> 1 -180.  89.8  1901     1          3.2