Since 1987, the National Oceanic and Atmospheric Administration’s (NOAA’s) National Climatic Data Center (NCDC) has used observations from the U.S. Historical Climatology Network (HCN) to quantify national- and regional-scale temperature changes in the conterminous United States (CONUS). To that end, U.S. HCN temperature records have been “corrected” to account for various historical changes in station loca- tion, instrumentation, and observing practice. The HCN is actually a designated subset of the NOAA Cooperative Observer Program (COOP) Network—the HCN sites having been selected according to their spatial coverage, record length, data completeness, and historical stability. The U.S. HCN, therefore, consists primarily of long-term COOP stations whose temperature records have been adjusted for systematic, nonclimatic changes that bias temperature trends.

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Menne et al - 2009 - Bull. AMS.pdf	New bias adjustments reduce uncertainty in temperature trends for the United States	2210 Kb	19/04/10 14:40

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