noaa-tree-20024 Southwest Alaska Tree Ring Stable Isotope Data Csank, A.Z.; Miller, A.E.; Sherriff, R.L.; Berg, E.; Welker, J. Southwest Alaska Tree Ring Stable Isotope Data 2016-04-15 NCDC-Paleoclimatology ONLINE Files 10.25921/echq-0g20 https://www.ncdc.noaa.gov/paleo/study/20024 Investigator A.Z. Csank Investigator A.E. Miller Investigator R.L. Sherriff Investigator E. Berg Investigator J. Welker earth science paleoclimate tree ring sample identification,null,null,null,null,tree ring,null,null,C,CC_D (dead trees); CC_L (live trees) earth science paleoclimate tree ring sample identification,null,null,null,null,tree ring,null,null,C,PB_D (dead trees); PB_L (live trees) earth science paleoclimate tree ring delta 18O,alpha cellulose,null,per mil VSMOW,null,tree ring,composited,null,N,"Chronology produced using 4 trees per group (Live, Dead)" earth science paleoclimate tree ring sample identification,null,null,null,null,tree ring,null,null,C,VR_D (dead trees); VR_L (live trees) earth science paleoclimate tree ring delta 13C,alpha cellulose,null,per mil VPDB,null,tree ring,composited|corrected,null,N,"Chronologies produced using 4 trees per group (Live, Dead) pooling samples prior to chemical processing; corrected for the decrease in atmospheric δ13C values due to the rise in CO2 caused by fossil fuel combustion since the beginning of the industrialization" earth science paleoclimate tree ring delta 18O,alpha cellulose,null,per mil VSMOW,null,tree ring,composited,null,N,"Chronologies produced using 4 trees per group (Live, Dead) pooling samples prior to chemical processing." earth science paleoclimate tree ring delta 18O,alpha cellulose,null,per mil VSMOW,null,tree ring,null,null,N,null earth science paleoclimate tree ring delta 18O,alpha cellulose,null,per mil VSMOW,null,tree ring,null,null,N,Processed to alpha cellulose using Modified Brendel method (Anchukaitis et al. 2008) earth science paleoclimate tree ring delta 13C,alpha cellulose,null,per mil VPDB,null,tree ring,composited|corrected,null,N,"Chronology produced using 4 trees per group (Live, Dead); corrected for the decrease in atmospheric δ13C values due to the rise in CO2 caused by fossil fuel combustion since the beginning of the industrialization" 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 delta 13C,alpha cellulose,null,per mil VPDB,null,tree ring,corrected,null,N,corrected for the decrease in atmospheric δ13C values due to the rise in CO2 caused by fossil fuel combustion since the beginning of the industrialization earth science paleoclimate tree ring sample identification,null,null,null,null,tree ring,null,null,C,BR_D (dead trees); BR_L (live trees) earth science paleoclimate tree ring age,null,null,year Common Era,null,tree ring,null,null,N,null earth science paleoclimate tree ring delta 13C,alpha cellulose,null,per mil VPDB,null,tree ring,corrected,null,N,Processed to alpha cellulose using Modified Brendel method (Anchukaitis et al. 2008); corrected for the decrease in atmospheric δ13C values due to the rise in CO2 caused by fossil fuel combustion since the beginning of the industrialization earth science paleoclimate tree-ring carbon isotopes earth science paleoclimate tree-ring oxygen isotopes geoscientificInformation 1950 AD 2011 AD 0 cal yr BP -61 cal yr BP Complete 58.3759 60.8067 -155.3842 -150.84 70 254 Continent North America United States Of America Alaska Valley of 10,000 Smokes>LATITUDE 58.3759>LONGITUDE -155.3842 Continent North America United States Of America Alaska Bufflehead Road>LATITUDE 60.8067>LONGITUDE -150.84 Continent North America United States Of America Alaska Currant Creek>LATITUDE 60.3097>LONGITUDE -153.9422 Continent North America United States Of America Alaska Pedro Bay>LATITUDE 59.7953>LONGITUDE -154.0987 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Csank, A.Z., A.E. Miller, R. Sherriff, E. Berg, and J. Welker 2016 Ecological Applications 26 7 2001–2020 10.1002/eap.1365

Increasing temperatures have resulted in reduced growth and increased tree mortality across large areas of western North American forests. Here we use tree-ring isotope chronologies (d13C and d18O) from live and dead trees from four locations in south-central Alaska to test whether white spruce trees killed by recent spruce beetle (Dendroctonus rufipennis Kirby) outbreaks showed evidence of drought stress prior to death. Trees that were killed were more sensitive to spring/summer temperature and/or precipitation than trees that survived. At two of our sites we found greater correlations between the d13C and d18O chronologies and spring/summer temperatures in dead trees than in live trees, suggesting that trees that are more sensitive to temperature-induced drought stress are more likely to be killed. At one site, the difference between d13C in live and dead trees was related to winter/spring precipitation, with dead trees showing stronger correlations between d13C and precipitation, again suggesting increased water stress in dead trees. At all sites where d18O was measured, d18O chronologies showed the greatest difference in climate response between live and dead groups, with d18O in live trees correlating more strongly with late winter precipitation than dead trees. Our results indicate that sites where trees are already sensitive to warm or dry early growing-season conditions experienced the most beetle-kill, which has important implications for forecasting future mortality events in Alaska. STUDY NOTES: Tree-ring stable isotope ratios of carbon and oxygen from trees killed during a recent spruce beetle outbreak and trees that survived from Southwest Alaska. Raw d13C data uncorrected for changing atmospheric CO2 or changing 13C value of the atmosphere are presented here. Site chronology produced using 4 trees per group (Live, Dead). IITRDB15

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/alaska/smokes2016iso-crn.txt Data File; Valley of 10,000 Smokes Tree Ring Isotope Chronologies GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/alaska/bufflehead2016iso-crn.txt Data File; Bufflehead Road Tree Ring Isotope Chronologies GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/alaska/smokes2016iso.txt Data File; Valley of 10,000 Smokes Tree Ring Isotope Raw Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/alaska/bufflehead2016iso.txt Data File; Bufflehead Road Tree Ring Isotope Raw Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/alaska/currant2016iso-crn.txt Data File; Currant Creek Tree Ring Isotope Chronologies GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/alaska/pedro2016iso-crn.txt Data File; Pedro Bay Tree Ring Isotope Chronologies USA/NOAA DIF Version 9.8.4 2019-03-01 2019-03-01