SPEI
**SPEI**
What is SPEI?
SPEI stands for Standardized Precipitation-Evapotranspiration Index. It is a widely used index to characterize drought conditions, considering both precipitation and potential evapotranspiration (PET). Unlike indices that only consider precipitation, SPEI takes into account the impact of temperature on water demand, making it more sensitive to drought conditions in a warming climate. It is calculated based on the difference between precipitation and PET over a specific time scale (e.g., 1, 3, 6, 12 months). These differences are then fitted to a probability distribution, and the SPEI value is derived based on the standardized values. This allows for comparisons of drought severity across different regions and time periods. SPEI is used for drought monitoring, assessment, and early warning systems in agriculture, water resources management, and climate change studies.
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