GLOSSARY

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

Composite water anomaly index combines multiple parameters to best capture water surpluses and deficits. Deficits are based on the most extreme of three water deficit indicators: soil moisture deficit, evapotranspiration deficit, and total blue water deficits.  Surpluses are based on the most extreme of two water surplus indicators: runoff surpluses and total blue water surpluses. Maps of the composite water anomaly index show deficits in warm colors and surpluses in cool colors. Because surpluses and deficits are estimated using different parameters, it is possible for a single half-degree cell to indicate both surpluses and deficits. These cases are shown in shades of purple, with the return period based on the more extreme of the surplus or deficit indicators.

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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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