calc_pv: Potential Vorticity (PV)

In meteoEVT: Computation and Visualization of Energetic and Vortical Atmospheric Quantities

Potential Vorticity (PV)

Description

Calculates the potential vorticity

Usage

calc_pv(
  t_fld,
  u_fld,
  v_fld,
  w_fld,
  lev_p,
  lat = NULL,
  dx = 0.25,
  dy = 0.25,
  zvort_only = FALSE,
  relative = FALSE,
  zvort_fld = NULL,
  mode = "lonlat"
)

Arguments

t_fld	temperature field [K]
u_fld	zonal velocity field [m/s]
v_fld	meridional velocity field [m/s]
w_fld	vertical velocity field [m/s]
lev_p	vector containing pressure levels [Pa]
lat	vector containing latitude
dx	x resolution in the corresponding unit (e.g. 0.25 degree for ERA5 with mode='lonlat' or e.g. 1000 m in cartesian coordinates with mode='cartesian')
dy	y resolution in the corresponding unit (e.g. 0.25 degree for ERA5 with mode='lonlat' or e.g. 1000 m in cartesian coordinates with mode='cartesian')
zvort_only	logical, TRUE: if only the vertical vorticity (zvort) should be calculated, FALSE: for the whole vorticity vector, default: FALSE
relative	logical, TRUE: only relative vorticity, FALSE: whole (absolute) vorticity, default: FALSE
zvort_fld	optional zvort field (if e.g., zvort is directly taken from ERA5 and not calculated separately)
mode	use 'lonlat' if the data is given on a lon-lat-grid or 'cartesian' if the data is given on an equidistant cartesian grid

Value

potential vorticity field [K*m^2/(kg*s)]

Examples

myfile=system.file("extdata", "era5_storm-zeynep.nc", package = "meteoEVT")
data = readin_era5(myfile)
#PV based on all three components
pv=calc_pv(data$temp,data$u,data$v,data$w,data$lev,lat=data$lat)
#PV only based on vertical component
pv_vert=calc_pv(data$temp,data$u,data$v,data$w,lev_p=data$lev,lat=data$lat,zvort_only=TRUE)

meteoEVT documentation built on Sept. 5, 2022, 9:06 a.m.