Characteristics of 20th century drought in the United States at multiple time scales
Characteristics of drought and wet periods were analyzed in terms of areal coverage, intensity, duration, frequency, and variability at different space and time scales. This provided insight not only into the historical perspective of anomalously dry and wet conditions, but also into the long-term variation of climate in the United States. The Standardized Precipitation Index (SPI) provided the means to analyze drought and wet periods at different time scales, a perspective that is not achieved with typical drought indices. The National Climatic Data Center and the Carbon Dioxide Information ...
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