This function creates a new virtual sensor on locality within the myClim data object. The virtual sensor represents the vapor pressure deficit (in kPa) calculated from temperature and relative air humidity.
mc_calc_vpd(
data,
temp_sensor = "HOBO_T",
rh_sensor = "HOBO_RH",
output_sensor = "VPD",
elevation = 0,
metadata_elevation = TRUE,
localities = NULL
)cleaned myClim object see myClim-package
name of temperature sensor. Temperature sensor must be in T_C physical.
name of relative air humidity sensor. Humidity sensor must be in RH physical.
name of new virtual VPD sensor (default "VPD")
value in meters (default 0)
if TRUE then elevation from metadata of locality is used (default TRUE)
list of locality_ids for calculation; if NULL then all (default NULL)
myClim object same as input but with added VPD sensor
Equation are from the CR-5 Users Manual 2009–12 from Buck Research. These equations have been modified from Buck (1981) and adapted by Jones, 2013 (eq. 5.15) Elevation to pressure conversion function uses eq. 3.7 from Campbell G.S. & Norman J.M. (1998).
Jones H.G. (2014) Plants and Microclimate, Third Edit. Cambridge University Press, Cambridge Buck A.L. (1981) New equations for computing vapor pressure and enhancment factor. Journal of Applied Meteorology 20: 1527–1532. Campbell G.S. & Norman J.M. (1998). An Introduction to Environmental Biophysics, Springer New York, New York, NY
agg_data <- mc_calc_vpd(mc_data_example_agg, "HOBO_T", "HOBO_RH", localities="A2E32")