数据描述

General GLEAM provides data of the different components of land evaporation (or 'evapotranspiration’): transpiration, bare-soil evaporation, interception loss, open-water evaporation and sublimation, in addition to other related variables such as surface and root-zone soil moisture, sensible heat flux, potential evaporation and evaporative stress conditions The Penman equation in GLEAM calculates potential evaporation (Ep) using observations of surface net radiation (Rn), near-surface air temperature (Ta), wind speed (u ), leaf area index (LAI), and vapor pressure deficit (VPD). Estimates of Ep for bare soil, tall canopy, and short canopy land fractions are converted into bare soil evaporation (Eb) and transpiration (Et) using a multiplicative evaporative stress factor (S ) derived from deep neural networks trained on global eddy-covariance and sapflow data. GLEAM4 datasets are described in detail by Miralles et al. (2025) GLEAM4.2 datasets GLEAM4 includes the following variables: Actual evaporation (E ) Transpiration (Et) Interception loss (Ei) Soil evaporation (Eb) Snow sublimation (Es) Surface condensation (Ec) Open-water evaporation (Ew) Potential evaporation (Ep) Evaporative stress (S ) Root-zone soil moisture (SMrz) Surface soil moisture (SMs) Sensible heat flux (H ) Two data archives differing in terms of forcing and temporal coverage: GLEAM4.2a: global dataset spanning the 44-year period from 1980 (January 1st) to 2023 (December 31st). The dataset is based on satellite and reanalysis data GLEAM4.2b (soon to be available): global dataset spanning the 21-year period from 2003 (January 1st) to 2023 (December 31st). The dataset is based on satellite data