U.S. Geological Survey
Fact Sheet 117-03
version 1.0

Precipitation History of the Mojave Desert Region, 1893–2001

time series of average negative SOI and SAI of cool+warm-season precipitation

Figure 6. Time series (upper) of average negative Southern Oscillation Index (SOI) (El Niño-like conditions have positive values) and SAI of cool+warm-season precipitation (lower).

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UNDERSTANDING EARTH SURFACE PROCESSES AND GEOLOGY—A KEY TO ENSURING FUTURE PROSPERITY