et_0 | R Documentation |
The panel of experts recommended in May 1990 the adoption of the FAO Penman-Monteith combination method as a new standard for reference evapotranspiration and advised on procedures for calculation of the various parameters (http://www.fao.org/docrep/X0490E/x0490e06.htm)
et_0( Alt, Lat, Dates, Tavg = NA, Tmax, Tmin, Rh = NA, RHmax = NA, RHmin = NA, Sd = NA, Rs = NA, Ws, Rads = F )
Alt |
station altitude (m) |
Lat |
latitude in degrees (WGS84; EPSG:4326) |
Dates |
date field reprezenting days of measurements |
Tavg |
daily mean temperature (ºC) |
Tmax |
daily maximum temperature (ºC) |
Tmin |
daily minimum temperature (ºC) |
Rh |
daily mean relative humidity (%) |
RHmax |
daily maximum relative humidity (%) |
RHmin |
daily minimum relative humidity (%) |
Sd |
daily sunshine duration (hours) |
Rs |
daily global solar radiation (MJ m-2 day-1) |
Ws |
daily wind speed (m/s) at 2m above ground level |
Rads |
if is TRUE return shortwave and longwave radiation |
http://www.fao.org/docrep/X0490E/x0490e08.htm
data(buc_baneasa) # convert wind speed form 10 magl to 2 magl ws2m <- wind_log(buc_baneasa$Ws,10, 0.1, 2) # compute ET0 et <- et_0( Alt = 90, Lat = 44.51072, Dates = as.Date(buc_baneasa$Date), Tmax = buc_baneasa$Tmax, Tmin = buc_baneasa$Tmax, Rh = buc_baneasa$Rh, Sd = buc_baneasa$Sd, Ws = ws2m) plot(buc_baneasa$Date, buc_baneasa$Sd, type = "l")
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