How was PET computed in the ERA5-Drought dataset? Assuming it uses the Penman-Monteith method (Allen et al., 1998), how were i. net radiation at crop surface (Rn); ii. soil heat flux density (G) and ii. slope of vapor pressure curve (delta) computed? At a monthly scale, could G (soil heat flux density) be assumed negligible? Thanks in advance.
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perhaps the documentation from AgERA5 can help you, they may use the same methodology: Data Stream 2: AgERA5 historic and near real time forcing data: Algorithm Theoretical Basis (ATBD) - Copernicus Knowledge Base - ECMWF Confluence Wiki
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