Evaluating the temperature sensitivity of radial growth patterns from whitebark pine in the western Canadian Cordillera

noaa-tree-13784 Youngblut - Grassy Mountain - PIAL - ITRDB CANA353 Youngblut, D.; Luckman, B.H. Youngblut - Grassy Mountain - PIAL - ITRDB CANA353 2013-02-08 NCDC-Paleoclimatology ONLINE Files 10.25921/3gaj-8467 https://www.ncdc.noaa.gov/paleo/study/13784 Investigator D. Youngblut Investigator B.H. 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units are 0.01 mm if end-of-series marker is 999 and 0.001 mm if end-of-series marker is -9999 earth science paleoclimate tree ring total ring width,null,null,millimeter,null,tree ring,null,null,N,Tree ID: Y0042E; units are 0.01 mm if end-of-series marker is 999 and 0.001 mm if end-of-series marker is -9999 earth science paleoclimate tree ring total ring width,null,null,millimeter,null,tree ring,null,null,N,Tree ID: YX004A; units are 0.01 mm if end-of-series marker is 999 and 0.001 mm if end-of-series marker is -9999 earth science paleoclimate tree ring total ring width,null,null,millimeter,null,tree ring,null,null,N,Tree ID: YX004B; units are 0.01 mm if end-of-series marker is 999 and 0.001 mm if end-of-series marker is -9999 earth science paleoclimate tree ring total ring width,null,null,millimeter,null,tree ring,null,null,N,Tree ID: YX005B; units are 0.01 mm if end-of-series marker is 999 and 0.001 mm if end-of-series marker is -9999 earth science paleoclimate tree-ring width geoscientificInformation PIAL Pinus albicaulis Engelm. whitebark pine 932 AD 1999 AD 1018 cal yr BP -49 cal yr BP Complete 49.5667 49.5667 -116.0833 -116.0833 1850 1850 Continent North America Canada British Columbia Grassy Mountain>LATITUDE 49.5667>LONGITUDE -116.0833 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. 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Boulder CO 80305-3328 USA online ASCII Donald K. Youngblut and Brian H. Luckman 2013 Evaluating the temperature sensitivity of radial growth patterns from whitebark pine in the western Canadian Cordillera Dendrochronologia 31 1 16-28 10.1016/j.dendro.2012.04.001 http://www.sciencedirect.com/science/article/pii/S1125786512000525

We present a network of thirteen annual ring-width chronologies from high elevation whitebark pine (Pinus albicaulis Engelm.) sites in the western Canadian Cordillera in order to assess the dendroclimatic potential of this long-lived tree species. The temperature signal within the chronologies is complex and strongly influenced by diverging trends in the summer temperature and ring-width records from across the region. A first differences transformation of the tree-ring and temperature records illustrates a loss of frequency coherence in growth response to summer temperatures following reduced radial growth in the 1950s. Prior to reduced growth, we note a positive association with summer temperatures for both first differenced (rd = 0.60) and traditional (r = 0.50) records. Following reduced growth, the association at first differences is maintained (rd = 0.49) whereas there is a change in the lower frequency component of tree growth response to summer temperatures (r = -0.34). We suggest the cause of this reduced temperature sensitivity is related to the interaction between diurnal temperature and cloud cover patterns, the hydrological regime of snowpack, and site conditions which have been amenable to the initiation of moisture stress during the latter half of the 20th century. Reduced radial growth is coincident with the arrival of white pine blister rust (Cronatium ribicola J.C. Fisch. ex Raben) into the study region which suggests this infestation may be related to the observed reduction in radial growth. Whitebark pine has considerable potential for the field of dendroclimatology. Unfortunately, the decline of the species due to the combined effects of climate change, white pine blister rust, mountain pine beetle (Dendroctonus ponderosae Hopk.), and forest fire exclusion practices indicate this potential may remain unfulfilled. STUDY NOTES: NOAA Template Raw Measurements file added 2019-02-04.

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