Compute atmospheric pressure at site

atm_pressure(alt, lon = NULL, lat = NULL, model = "stone2000")

Arguments

alt: Altitude (m)
lon: Longitude (degrees) optional (only for "era40" model)
lat: Latitude (degrees) optional (only for "era40" model)
model: Model used for computation, one of "stone2000" or "era40"

Value

Atmospheric pressure in hPa

Details

Choice of models :

(1) "stone2000" (default) : equation 1 of Stone (2000) JGR paper (only function of site altitude) Stone (2000) https://doi.org/10.1029/2000JB900181

(2) "era40" : Looks up mean sea level pressure and mean 1000 mb temp from ERA-40 reanalysis and calculates site atmospheric pressures using these as inputs to the standard atmosphere equation (function of site latitude, longitude and altitude). Uppala et al (2005) https://doi.org/10.1256/qj.04.176

Examples

z = seq(0,5000,by=100)
P1=atm_pressure(alt=z,model="stone2000")
P2=atm_pressure(alt=z,lat=-60,lon=0,model="era40")
plot(P1,z,type="l",xlab="Pressure (hPa)",ylab="Altitude (m)")
lines(P2,z,lty=2)