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    Resources: Ten Year Scale
Hydrograph Example of Interannual Climate Variability


Due to the importance of the El Niño/Southern Oscillation (ENSO) on the global climate system, NOAA provides numerous resources on this phenomenon, including the El Niño homepage and the PMEL El Niño Theme page. Also see the International Research Institute for Climate Prediction ENSO Quick Look for the latest forecast.

Go to the CDC (Climate Diagnostic Center) ENSO website to access ENSO data, and USGS' Water Website for streamflow data to reconstruct past runoff patterns.

CDC's online resources for weather and climate information for the United States and Regional Climate Centers provides regional resources and links.

Additional NOAA and related resources include:


Streamflows and the Stories They Tell

Streamflow patterns as visualized in a hydrograph can be a valuable tool for tracking patterns of drought or wet periods. When correlated with precipitation records or paleo proxies, illustrating how climate varies year-to-year, and whether or not such patterns as ENSO impact regional climate.

A series of dry years are an indicator of hydrologic drought conditions. Spikes in runoff may imply heavier than normal precipitation and possible flood events, while high runoff during late summer months may reflect strong monsoon conditions.

The below streamflow graph of Boulder Creek from the USGS's Water Resources in the United States website provides a snapshot of how runoff has varied in a recent ten-year period. Using "discharge," as a measure of flow, the units of measure are cubic-feet-per-second or CFS.

Hydrograph Example of Interannual Climate Variability Hydrograph of Boulder Creek at Orodell
Be sure to check out Interannual Hydrograph Signatures.



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