noaa-recon-19743 Northern Hemisphere 1250 Year N-TREND Summer Temperature Reconstructions Wilson, R.J.S.; Anchukaitis, K.J.; Briffa, K.R.; Büntgen, U.; Cook, E.R.; D'Arrigo, R.D.; Davi, N.K.; Esper, J.; Frank, D.C.; Gunnarson, B.E.; Hegerl, G.C.; Helama, S.; Klesse, S.; Krusic, P.J.; Linderholm, H.W.; Myglan, V.S.; Osborn, T.J.; Rydval, M.; Schneider, L.; Schurer, A.P.; Wiles, G.; Zhang, P.; Zorita, E. Northern Hemisphere 1250 Year N-TREND Summer Temperature Reconstructions 2016-01-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19743 Investigator R.J.S. Wilson Investigator K.J. Anchukaitis Investigator K.R. Briffa Investigator U. Büntgen Investigator E.R. Cook Investigator R.D. D'Arrigo Investigator N.K. Davi Investigator J. Esper Investigator D.C. Frank Investigator B.E. Gunnarson Investigator G.C. Hegerl Investigator S. Helama Investigator S. Klesse Investigator P.J. Krusic Investigator H.W. Linderholm Investigator V.S. Myglan Investigator T.J. Osborn Investigator M. Rydval Investigator L. Schneider Investigator A.P. Schurer Investigator G. Wiles Investigator P. Zhang Investigator E. Zorita 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,null,null,standard deviation unit,summer,climate reconstructions|tree ring,composited,null,N,Z-score relative to the 1750-1950 period earth science paleoclimate climate reconstructions|tree ring surface temperature,null,two standard deviations lower bound,degree Celsius,May-Aug,climate reconstructions|tree ring,anomalized,null,N,null earth science paleoclimate climate reconstructions|tree ring surface temperature,null,null,degree Celsius,May-Aug,climate reconstructions|tree ring,anomalized,null,N,null earth science paleoclimate climate reconstructions|tree ring surface temperature,null,two standard deviations lower bound,degree Celsius,May-Aug,climate reconstructions|tree ring,anomalized|smoothed,null,N,smoothed 20 year spline earth science paleoclimate climate reconstructions|tree ring surface temperature,null,null,standard deviation unit,summer,climate reconstructions|tree ring,composited|smoothed,null,N,Z-score relative to the 1750-1950 period; smoothed 20 year spline earth science paleoclimate instrumental surface temperature,null,null,degree Celsius,May-Aug,instrumental,anomalized,null,N,null earth science paleoclimate climate reconstructions|tree ring surface temperature,null,null,degree Celsius,May-Aug,climate reconstructions|tree ring,anomalized|smoothed,null,N,smoothed 20 year spline earth science paleoclimate tree ring tree ring standardized growth index,null,null,null,null,tree ring,composited,null,N,null earth science paleoclimate tree ring tree ring standardized growth index,null,null,null,null,tree ring,composited|smoothed,null,N,smoothed 20 year spline earth science paleoclimate tree ring age,null,null,year Common Era,null,tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring surface temperature,null,two standard deviations upper bound,degree Celsius,May-Aug,climate reconstructions|tree ring,anomalized,null,N,null earth science paleoclimate climate reconstructions|tree ring surface temperature,null,two standard deviations upper bound,degree Celsius,May-Aug,climate reconstructions|tree ring,anomalized|smoothed,null,N,smoothed 20 year spline earth science paleoclimate instrumental surface temperature,null,null,degree Celsius,May-Aug,instrumental,anomalized|smoothed,null,N,smoothed 20 year spline earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction 750 AD 2014 AD 1200 cal yr BP -64 cal yr BP Complete 0 90 -180 180 Geographic Region Northern Hemisphere Northern Hemisphere>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 Rob Wilson, Kevin Anchukaitis, Keith R. Briffa, Ulf Büntgen, Edward Cook, Rosanne D'Arrigo, Nicole Davi, Jan Esper, Dave Frank, Björn Gunnarson, Gabi Hegerl, Samuli Helama, Stefan Klesse, Paul J. Krusic, Hans W. Linderholm, Vladimir Myglan, Timothy J. Osborn, Miloš Rydval, Lea Schneider, Andrew Schurer, Greg Wiles, Peng Zhang, Eduardo Zorita 2016 Quaternary Science Reviews 134 1-18 10.1016/j.quascirev.2015.12.005 http://www.sciencedirect.com/science/article/pii/S0277379115301888 Kevin J. Anchukaitis, Rob Wilson, Keith R. Briffa, Ulf Büntgen, Edward R. Cook, Rosanne D'Arrigo, Nicole Davi, Jan Esper, David Frank, Björn E. Gunnarson, Gabi Hegerl, Samuli Helama, Stefan Klesse, Paul J. Krusic, Hans W. Linderholm, Vladimir Myglan, Timothy J. Osborn, Peng Zhang, Eduardo Zorita 2018 Quaternary Science Reviews 163 1-22 10.1016/j.quascirev.2017.02.020 https://www.sciencedirect.com/science/article/pii/S0277379117301592

Large-scale millennial length Northern Hemisphere (NH) temperature reconstructions have been progressively improved over the last 20 years as new datasets have been developed. This paper, and its companion (Part II, Anchukaitis et al. in prep), details the latest tree-ring (TR) based NH land air temperature reconstruction from a temporal and spatial perspective. This work is the first product of a consortium called N-TREND (Northern Hemisphere Tree-Ring Network Development) which brings together dendroclimatologists to identify a collective strategy for improving large-scale summer temperature reconstructions. The new reconstruction, N-TREND2015, utilises 54 records, a significant expansion compared with previous TR studies, and yields an improved reconstruction with stronger statistical calibration metrics. N-TREND2015 is relatively insensitive to the compositing method and spatial weighting used and validation metrics indicate that the new record portrays reasonable coherence with large scale summer temperatures and is robust at all time-scales from 918 to 2004 where at least 3 TR records exist from each major continental mass. N-TREND2015 indicates a longer and warmer medieval period (~900-1170) than portrayed by previous TR NH reconstructions and by the CMIP5 model ensemble, but with better overall agreement between records for the last 600 years. Future dendroclimatic projects should focus on developing new long records from data-sparse regions such as North America and eastern Eurasia as well as ensuring the measurement of parameters related to latewood density to complement ring-width records which can improve local based calibration substantially. STUDY NOTES: Northern Hemisphere Tree-Ring Network Development (N-TREND) consortium 2015 and 2017 Northern Hemisphere summer temperature reconstructions for AD 750-2011. Reconstructions are based on 54 tree-ring records. Field reconstructions netCDF data file (Anchukaitis et al. 2017) added 2 April 2018.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2015tr.txt Data File; N-TREND2015 Tree-Ring Records GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2015.txt Data File; N-TREND2015 Reconstruction and Assessment Metrics GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2015mxdrwl.txt Data File; N-TREND2015 Parameter-specific NH composites GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2015regionc3.txt Data File; N-TREND2015 North American and Eurasian Composite Mean Series GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2017grid.nc netCDF Data File; Anchukaitis et al. 2017 N-TREND Summer Temperature Field Reconstructions GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2015.xlsx Excel Data File; N-TREND2015 All Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/n_hem_temp/ntrend2015regionc2.txt Data File; N-TREND2015 Longitude Quadrant Composite Mean Series USA/NOAA DIF Version 9.8.4 2019-05-17 2019-05-17