farms.farms_dni.TDD2

farms.farms_dni.TDD2(Z, Ftotal, F1)[source]

Compute surface reflection that falls in the circumsolar region. A parameterization of Eq. (S4) in Xie et al (2020) is used.

All arrays should have the same shape (n_times) or (n_times, n_lats, n_lons)

Parameters:

Z (np.ndarray) – solar zenith angle (degree).
Ftotal (np.ndarray) – GHI (Wm-2)
F1 (np.ndarray) – First order solar radiation given in FARMS (Wm-2). See Xie et al. (2016) for more details.

Returns:

Fd2 (np.ndarray) – Direct radiation caused by the reflection between surface and cloud (Wm-2).