bridget.eddy.footprint_kormann¶

bridget.eddy.footprint_kormann(dt_index, t_air, a, p, u, cov_uw, cov_vw, cov_wt, var_v, direction, tstamp, z, fetch, grid)[source]¶

Footprint function to calculate the footprint after Kormann & Meixner (2001).

Parameters

dt_index (list, datetime) – datetime list corresponding to the other variables.
t_air (list, float) – air temperature [°C].
a (list, float) – absolute humidity [g/m3].
p (list, float) – air pressure [hPa].
u (list, float) – horizontal wind component for the direction in which the sonic is oriented [m/s].
cov_uw (list, float) – Covariance between the wind components u and w [m2/s2].
cov_vw (list, float) – Covariance between the wind components v and w [m2/s2].
cov_wt (list, float) – Covariance between the wind component w and temperature [(m*°C)/s].
var_v (list, float) – variance of v (horizontal wind component for the direction rectangular to the orientation of the sonic) [m/s].
direction (list, float) – wind direction [°].
tstamp (int) – index of the line/time at which the footprint is to be calculated.
z (float) – measurement height [m].
fetch (int) – upwind distance over which calculation domain to extends [m].
grid (int) – total calculation grid.

Returns

fp (ndarray, float) – 2D array containing the footprint values [1/m2].
FP_east (ndarray, float) – 2D array containing the grid point distance east of the center point [m].
FP_north (ndarray, float) – 2D array containing the grid point distance north of the center point [m].
fp_norm (ndarray, float) – 2D array containing the normalized footprint values [-].

References

Kormann & Meixner 2001, An Analytical Footprint Model For Non-Neutral Stratification

bridget.eddy.footprint

Sap Flow Module