noaa-recon-14789 Firth River Alaska 930 Year Maximum Latewood Density Temperature Reconstruction Anchukaitis, K.J.; D'Arrigo, R.D.; Andreu-Hayles, L.; Frank, D.C.; Verstege, A.; Curtis, A.E.; Buckley, B.M.; Jacoby, G.C.; Cook, E.R. Firth River Alaska 930 Year Maximum Latewood Density Temperature Reconstruction 2013-08-19 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/14789 Investigator K.J. Anchukaitis Investigator R.D. D'Arrigo Investigator L. Andreu-Hayles Investigator D.C. Frank Investigator A. Verstege Investigator A.E. Curtis Investigator B.M. Buckley Investigator G.C. Jacoby 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 temperature,ring density,null,degree Celsius,Jul-Aug,climate reconstructions|tree ring,anomalized,null,N,based on latewood density; 1951–1980 reference period earth science paleoclimate tree ring tree ring standardized growth index,null,null,null,null,tree ring,composited,standard,N,Thelon MXD earth science paleoclimate tree ring tree ring standardized growth index,null,null,null,null,tree ring,composited,null,N,Firth River 1236 MXD earth science paleoclimate tree ring tree ring standardized growth index,null,null,null,null,tree ring,composited,standard,N,Coppermine MXD earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,two standard deviations lower bound,degree Celsius,Jul-Aug,climate reconstructions|tree ring,anomalized,null,N,based on latewood density; 1951–1980 reference period; +/-2sigma uncertainties estimated as the smoothed ensemble standard error of prediction earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,two standard deviations upper bound,degree Celsius,Jul-Aug,climate reconstructions|tree ring,anomalized,null,N,based on latewood density; 1951–1980 reference period; +/-2sigma uncertainties estimated as the smoothed ensemble standard error of prediction earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction temperature 1073 AD 2002 AD 877 cal yr BP -52 cal yr BP Complete 68.65 68.65 -141.63 -141.63 790 790 Continent North America United States Of America Alaska Firth River 1236>LATITUDE 68.65>LONGITUDE -141.63 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 Kevin J. Anchukaitis, Rosanne D. D'Arrigo, Laia Andreu-Hayles, David Frank, Anne Verstege, Ashley Curtis, Brendan M. Buckley, Gordon C. Jacoby, Edward R. Cook. 2013. Tree-Ring-Reconstructed Summer Temperatures from Northwestern North America during the Last Nine Centuries. Journal of Climate, Vol. 26, Issue 10, pp. 3001-3012. DOI: 10.1175/JCLI-D-11-00139.1

Northwestern North America has one of the highest rates of recent temperature increase in the world, but the putative "divergence problem" in dendroclimatology potentially limits the ability of tree-ring proxy data at high latitudes to provide long-term context for current anthropogenic change. Here, summer temperatures are reconstructed from a Picea glauca maximum latewood density (MXD) chronology that shows a stable relationship to regional temperatures and spans most of the last millennium at the Firth River in northeastern Alaska. The warmest epoch in the last nine centuries is estimated to have occurred during the late twentieth century, with average temperatures over the last 30 yr of the reconstruction developed for this study [1973-2002 in the Common Era (CE)] approximately 1.3° ± 0.4°C warmer than the long-term preindustrial mean (1100-1850 CE), a change associated with rapid increases in greenhouse gases. Prior to the late twentieth century, multidecadal temperature fluctuations covary broadly with changes in natural radiative forcing. The findings presented here emphasize that tree-ring proxies can provide reliable indicators of temperature variability even in a rapidly warming climate. STUDY NOTES: Tree-ring maximum latewood density (MXD) based reconstruction of July-August temperature from northeastern Alaska from trees samples in the Firth River valley. This series is based on Signal-Free (SF) standardization of a maximum latewood density data collection of living and subfossil samples. Data are from Figure 7 and 9, Anchukaitis et al. 2013. Summer (July and August) weighted mean ensemble Firth River temperature reconstruction smoothed with a 30-year Gaussian filter and including +/-2sigma uncertainties estimated as the smoothed ensemble Standard Error of Prediction. Reconstructed values are anomalies from the 1951–1980 mean July-August GISTEMP for the Firth River the ensemble methods by their validation period bias such that more skillful reconstructions receive a larger weight for the ensemble mean. The raw data are archived in the ITRDB as ak132x: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/treering/measurements/northamerica/usa/ak132x.rwl

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/alaska/firth2013temperature.txt USA/NOAA DIF Version 9.8.4 2019-05-17 2019-05-17