noaa-recon-16257 North America Last 2ka Decadal Temperature Reconstructions Trouet, V.; Diaz, H.F.; Wahl, E.R.; Viau, A.E.; Graham, R.; Graham, N.E.; Cook, E.R. North America Last 2ka Decadal Temperature Reconstructions 2014-03-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16257 Investigator V. Trouet Investigator H.F. Diaz Investigator E.R. Wahl Investigator A.E. Viau Investigator R. Graham Investigator N.E. Graham Investigator E.R. Cook earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,16th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,null,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,wrt 1904-1980; principal components spatial regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,97.5th percentile; wrt 1904-1980; principal components spatial regression; 2m air temperature earth science paleoclimate climate reconstructions|pollen age,null,null,year Common Era,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,2.5th percentile; wrt 1904-1980; principal components spatial regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,0.5th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|pollen surface air temperature,null,two standard error lower bound,degree Celsius,annual,climate reconstructions|pollen,anomalized,principal component analysis|regression analysis,N,wrt 1904-1980; principal components regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,null,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,99.5th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|pollen surface air temperature,null,one standard error upper bound,degree Celsius,annual,climate reconstructions|pollen,anomalized,principal component analysis|regression analysis,N,wrt 1904-1980; principal components regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,5th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,97.5th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|pollen surface air temperature,null,null,degree Celsius,annual,climate reconstructions|pollen,anomalized,principal component analysis|regression analysis,N,wrt 1904-1980; principal components regression; 2m air temperature earth science paleoclimate climate reconstructions|pollen surface air temperature,null,one standard error lower bound,degree Celsius,annual,climate reconstructions|pollen,anomalized,principal component analysis|regression analysis,N,wrt 1904-1980; principal components regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,2.5th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,84th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|tree ring surface air temperature,ring width,percentile,degree Celsius,annual,climate reconstructions|tree ring,anomalized,regression analysis,N,95th percentile; wrt 1904-1980; simple linear regression; 2m air temperature earth science paleoclimate climate reconstructions|pollen surface air temperature,null,two standard error upper bound,degree Celsius,annual,climate reconstructions|pollen,anomalized,principal component analysis|regression analysis,N,wrt 1904-1980; principal components regression; 2m air temperature earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction PAGES 2k Network PAGES NAmerica 2k temperature 480 AD 1987 AD 1470 cal yr BP -37 cal yr BP Complete 30 55 -130 -75 Continent North America Temperate North America>LATITUDE >LONGITUDE None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Trouet, V., H.F. Diaz, E.R. Wahl, A. Viau, R. Graham, N. Graham, and E.R. Cook 2013 Environmental Research Letters 8 2 024008 10.1088/1748-9326/8/2/024008 http://iopscience.iop.org/1748-9326/8/2/024008/article PAGES 2k Consortium. 2013. Continental-scale temperature variability during the past two millennia. Nature Geoscience, Vol. 6, pp. 339-346, May 2013. www.nature.com/naturegeoscience DOI: 10.1038/NGEO1797

Past global climate changes had strong regional expression. To elucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between ad 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period ad 1971-2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years. STUDY NOTES: PAGES North America 2k Temperature Reconstructions, including tree-ring based reconstructions at annual and decadal resolution (1200-1980 CE), plus a pollen-based reconstruction at 30 year resolution (480-1950 CE).

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/trouet2013nam480pollen.txt Data File; PAGES North America 2k Temperature, Pollen-based 30 Year Resolution GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/trouet2013nam1200tr-ann.txt Data File; PAGES North America 2k Temperature, Tree-Ring-based Annual Resolution GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/trouet2013nam1200tr-dec.txt Data File; PAGES North America 2k Temperature, Tree-Ring-based 10 Year Resolution USA/NOAA DIF Version 9.8.4 2019-05-17 2019-05-17