GLOSSARY

This glossary provides definitions of important terms used in the descriptions of ISciences' capabilities and products.

Evapotranspiration deficit is the difference between the amount of water that would be transpired or evaporated if water supply was unlimited (potential evapotranspiration), and the amount of water that is actually transpired or evaporated (estimated from temperature, precipitation, change in soil moisture, and soil characteristics). Large values relative to the norm indicate likely vegetative stress unless the difference is made up using irrigation.

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Many analyses reported in ISciences-authored blog posts are based on data generated by the ISciences Water Security Indicator Model (WSIM). Other sources, if used, are referenced in footnotes accompanying individual posts. WSIM is a validated capability that produces monthly reports on current and forecast global freshwater surpluses and deficits with lead times of 1-9 months at 0.25°x0.25° resolution. This capability has been in continuous operation since April 2011 and has proven to provide reliable forecasts of emerging water security concerns in that time-frame. WSIM has the ability to assess the impacts of water anomalies on people, agriculture, and electricity generation. Detailed data, customized visualizations, and reports are available for purchase.

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