GLOSSARY

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

Return period is expected number of years between events of a particular magnitude. A 30-year high temperature, for example, is a temperature that would be expected to occur once every 30 years, based on data distributions for the period 1950 through 2009. Return periods are computed locally, i.e., for each half-degree cell, based on historical data for that locale. Five levels of stress are defined, each of which corresponds to a range of return periods as follows: Notable=3-5 years, moderate=5-10 years, severe=10-20 years, extreme 20-40 years, and exceptional= greater than 40 years.

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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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