Figure : north-american-regional-reanalysis-precipitation-data

North American Regional Reanalysis (NARR) Precipitation Data

Figure 18

This figure appears in the Our Changing Planet: The U.S. Climate Change Science Program for Fiscal Years 2004 and 2005 report.

Assimilation of observed precipitation is the most important data addition to the North American Regional Reanalysis (NARR), because successful assimilation of these observations enables more realistic modeling of the hydrological cycle than otherwise would be possible. This figure shows a comparison, during a strong El Niño event (January 1997), over North America of analyzed precipitation based on observations (top panel) and the NARR precipitation output (bottom panel). The color scale indicates inches per month. The comparison shows extremely high agreement over land, even over the complex western topography. The regional reanalysis provides coupled atmospheric and land water cycle components that include preciptation fields in much better agreement with observed precipitation fields than previously available over North America. Credit: NOAA/National Weather Service/National Centers for Environmental Prediction.

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