Dear Community,
I have some questions about the calculation of annual AET in the Seasonal Water Yield module.
I design the scenario 1 to test whether the precipitation at month m would contribute to the monthly AET of month m+1 ~ 12 in this module. In brief, I set all 12 months’ input data as the input data of month m. And then I set the data related to precipitation (raster data of monthly precipitation, table data of number of monthly rain events) of Nan-m months to “0” value. I set α to 1/12.
The output results (Table 1) showed that the value of annual AET was the same whether the value of m was set to 9 or 12, which seems to indicate that the precipitation at month m would NOT contribute to the monthly AET of month m+1 ~ 12 in this module design.
Besides, I added another scenario. In brief, I set all 12 months’ input data as the input data of month m. And then I set the data related to precipitation (raster data of monthly precipitation, table data of number of monthly rain events) of month 1 ~m-1 to “0” value. We set α to 1/12.
The output results (Table 2) showed that as the value of m increased from 9 to 12, the increment of annual AET was very small, which really confused us. In addition, when we set α to Pm-1/P, the increment of annual AET became a little bit bigger (Table 3).
I am really confused of such small increment of annual AET in the second scenario and looking forward to your guidance.
Note: I have attached the sumrised output data (Table 1, Table 2, and Table 3) in TEST_20230329.csv.
TEST_20230329.csv (2.2 KB)
Thanks all in advance!
Best,
Jiangxuan