Help me, this problem has been bothering me for a long time. I would like to ask, when I set swint_opt=1, my SWDOWN does not match with the SWDOWN when swint_opt=2. But according to the official website, the Fast All Sky Radiation Model (FARMS) scenario for solar applications can be activated by setting swint_opt = 2. FARMS calculates the surface irradiance for each model time step and stores the value in SWDOWN2, what is the difference between the output SWDOWN and SWDOWN2 at this point? I am not sure which variable I should use as a result of the total irradiance.
I would like to get the answer and appreciate it in advance.
I would like to get the answer and appreciate it in advance.