# Columbia Icefield 1,000 Year Decadal Tree-Ring Isotope, RH, and Temperature #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # # Online_Resource: http://ncdc.noaa.gov/paleo/study/17576 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/canada/columbia2008iso.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Tree Ring #-------------------- # Contribution_Date # Date: 2014-12-10 #-------------------- # Title # Study_Name: Columbia Icefield 1,000 Year Decadal Tree-Ring Isotope, RH, and Temperature #-------------------- # Investigators # Investigators: Edwards, T.W.D.; Birks, S.J.; Luckman, B.H.; MacDonald, G.M. #-------------------- # Description_and_Notes # Description: Tree-ring isotopic data (d18O and d13C) from the Columbia Icefield area # of the Canadian Rockies at decadal resolution, plus reconstructed winter temperature (Twin) # and growth season atmospheric relative humidity (RHgrs) over the past 1000 years. # Composite d13C and d18O chronologies spanning AD 951-1990 were developed from cross-dated # 10-yr increments of Picea engelmannii (Engelmann spruce) and Pinus albicaulis (whitebark pine) # collected from 16 subfossil snags and living-tree sequences at three sites near the Athabasca, # Robson, and Bennington glaciers. Carbon-isotope analyses were performed on cellulose by # closed-tube combustion followed by dual-inlet mass spectrometry. The d13C data were corrected # for changing d13C of atmospheric CO2 post-1850. Cellulose oxygen-isotope data were obtained # by high-temperature pyrolysis followed by CF-IRMS. Growth season RH and winter T were # reconstructed using a coupled isotope response-surface approach. # See Edwards et al. (2008) for full details. # # #-------------------- # Publication # Authors: Thomas W.D. Edwards, S. Jean Birks, Brian H. Luckman, Glen M. MacDonald # Published_Date_or_Year: 2008-09-01 # Published_Title: Climatic and hydrologic variability during the past millennium in the eastern Rocky Mountains and northern Great Plains of western Canada # Journal_Name: Quaternary Research # Volume: 70 # Edition: # Issue: 2 # Pages: 188-197 # DOI: 10.1016/j.yqres.2008.04.013 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0033589408000604 # Full_Citation: # Abstract: Modelling of tree-ring d13C and d18O data from the Columbia Icefield area in the eastern Rocky Mountains of western Canada provides fuller understanding of climatic and hydrologic variability over the past 1000 yr in this region, based on reconstruction of changes in growth season atmospheric relative humidity (RHgrs), winter temperature (Twin) and the precipitation d18O-Twin relation. The Little Ice Age (~AD 1530s-1890s) is marked by low RHgrs and Twin and a d18O-Twin relation offset from that of the present, reflecting enhanced meridional circulation and persistent influence of Arctic air masses. Independent proxy hydrologic evidence suggests that snowmelt sustained relatively abundant streamflow at this time in rivers draining the eastern Rockies. In contrast, the early millennium was marked by higher RHgrs and Twin and a d18O-Twin relation like that of the 20th century, consistent with pervasive influence of Pacific air masses because of strong zonal circulation. Especially mild conditions prevailed during the "Medieval Climate Anomaly" ~AD 1100-1250, corresponding with evidence for reduced discharge in rivers draining the eastern Rockies and extensive hydrological drought in neighbouring western USA. #------------------ # Funding_Agency # Funding_Agency_Name: Natural Sciences and Engineering Research Council of Canada # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: British Columbia Hydro and Power Authority # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: #------------------ # Site_Information # Site_Name: Columbia Icefield # Location: North America>Canada>British Columbia # Country: Canada # Northernmost_Latitude: 53.0 # Southernmost_Latitude: 52.0 # Easternmost_Longitude: -117.0 # Westernmost_Longitude: -119.0 # Elevation: m #------------------ # Data_Collection # Collection_Name: Columbia2008iso # Earliest_Year: 951 # Most_Recent_Year: 1990 # Time_Unit: AD # Core_Length: m # Notes: #------------------ # Species # Species_Name: Picea engelmannii # Common_Name: Engelmann spruce #------------------ # Species # Species_Name: Pinus albicaulis # Common_Name: Whitebark pine #------------------ # Chronology: # # #---------------- # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ##age_AD_start age start year, , , AD, , , , ,N ##age_AD_end age end year, , , AD, , , , ,N ##d13CcellVPDB delta13C, cellulose, , per mil VPDB, ,tree ring, mean, ,N ##d13CcellVPDBerr delta13C uncertainty, cellulose, , per mil VPDB, ,tree ring, , ,N ##d18OcellVSMOW delta18O, cellulose, , per mil VSMOW, ,tree ring, mean, ,N ##d18OcellVSMOWerr delta18O uncertainty, cellulose, , per mil VSMOW, ,tree ring, , ,N ##RH Relative Humidity, , , z-score, growth season, climate reconstruction, wrt 1941-90 average, ,N ##tempanom-DJF Surface Temperature Anomaly, , , z-score, winter, climate reconstruction, wrt 1941-90 average, ,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_AD_start age_AD_end d13CcellVPDB d13CcellVPDBerr d18OcellVSMOW d18OcellVSMOWerr RH tempanom-DJF 1981 1990 -21.56 0.30 23.82 0.13 -0.1423 -0.0528 1971 1980 -21.68 0.75 24.05 0.01 -0.0711 0.2187 1961 1970 -21.67 0.60 23.59 0.31 0.0316 -0.0805 1951 1960 -21.84 0.30 23.89 0.07 0.1398 0.2857 1941 1950 -21.60 0.57 23.25 0.34 0.0419 -0.3711 1931 1940 -21.82 0.44 23.20 0.55 0.2900 -0.1723 1921 1930 -21.75 0.17 24.46 0.55 -0.0963 0.5472 1911 1920 -22.10 0.52 24.67 0.55 0.2276 1.0437 1901 1910 -21.74 0.37 23.99 0.55 0.0095 0.2401 1891 1900 -21.51 0.45 24.29 0.55 -0.0405 -0.5010 1881 1890 -20.93 0.44 24.86 0.55 -0.8048 -0.7442 1871 1880 -21.28 0.84 25.62 1.13 -0.6178 0.1011 1861 1870 -20.84 0.50 24.67 0.16 -0.8531 -0.9609 1851 1860 -20.63 0.61 25.15 0.50 -1.1990 -0.8728 1841 1850 -20.25 0.74 25.27 0.11 -1.6358 -1.1948 1831 1840 -20.42 0.54 25.47 0.11 -1.5028 -0.8918 1821 1830 -20.90 0.65 25.07 0.33 -0.8890 -0.6428 1811 1820 -20.90 0.68 24.50 0.87 -0.7478 -1.0025 1801 1810 -20.69 0.58 25.00 0.34 -1.0982 -0.9030 1791 1800 -20.85 0.64 25.33 0.89 -1.0075 -0.5299 1781 1790 -20.64 0.65 25.79 0.91 -1.3458 -0.4611 1771 1780 -20.81 0.99 24.06 0.87 -0.7345 -1.3761 1761 1770 -20.40 0.60 24.55 1.65 -1.2978 -1.4894 1751 1760 -20.41 0.54 24.65 1.20 -1.3111 -1.4179 1741 1750 -20.06 0.43 24.82 1.29 -1.7301 -1.6721 1731 1740 -20.27 0.79 24.77 0.60 -1.4922 -1.4852 1721 1730 -20.04 0.64 24.31 0.83 -1.6247 -2.0161 1711 1720 -19.98 0.35 23.57 0.55 -1.5056 -2.5459 1701 1710 -19.58 0.45 24.04 0.55 -2.0524 -2.6635 1691 1700 -20.28 0.39 23.98 0.55 -1.2854 -1.9741 1681 1690 -20.45 0.40 22.98 0.55 -0.8531 -2.4334 1671 1680 -20.73 0.50 23.81 0.55 -0.7593 -1.6151 1661 1670 -20.43 0.36 23.54 0.26 -1.0157 -2.0948 1651 1660 -20.37 0.22 24.11 0.21 -1.2210 -1.7984 1641 1650 -20.57 0.55 24.03 0.63 -0.9856 -1.6428 1631 1640 -20.32 0.26 24.13 0.55 -1.2790 -1.8394 1621 1630 -20.54 0.27 24.27 0.17 -1.0780 -1.5206 1611 1620 -20.31 0.28 24.03 0.55 -1.2650 -1.9129 1601 1610 -20.57 0.45 23.46 0.39 -0.8447 -2.0016 1591 1600 -20.29 0.28 23.42 0.13 -1.1340 -2.3219 1581 1590 -20.58 0.40 23.63 0.13 -0.8749 -1.8870 1571 1580 -20.96 0.45 23.90 0.11 -0.5356 -1.3165 1561 1570 -21.06 0.61 24.50 0.07 -0.5762 -0.8355 1551 1560 -20.65 0.38 24.83 0.09 -1.0988 -1.0525 1541 1550 -21.03 0.39 24.00 0.54 -0.4843 -1.1829 1531 1540 -21.49 0.63 25.01 0.86 -0.2409 -0.0659 1521 1530 -21.14 0.49 24.48 0.53 -0.4861 -0.7630 1511 1520 -21.55 0.53 24.23 0.54 -0.2563 0.1998 1501 1510 -21.57 0.43 24.45 0.57 -0.2893 0.3592 1491 1500 -21.57 0.35 24.40 0.30 -0.2750 0.3229 1481 1490 -21.59 0.56 23.97 0.55 -0.1482 0.0754 1471 1480 -21.82 0.48 23.38 0.28 0.2462 -0.0607 1461 1470 -21.67 0.51 23.87 0.16 -0.0378 0.0962 1451 1460 -22.17 0.45 22.63 0.36 0.8079 -0.1698 1441 1450 -21.68 0.50 23.33 0.12 0.1086 -0.2388 1431 1440 -21.89 0.26 22.96 0.31 0.4247 -0.2510 1421 1430 -21.92 0.26 23.92 0.94 0.2199 0.3839 1411 1420 -21.84 0.37 23.80 0.54 0.1622 0.2287 1401 1410 -21.78 0.43 23.64 0.46 0.1373 0.0656 1391 1400 -21.99 0.45 23.77 0.17 0.3323 0.3618 1381 1390 -22.01 0.38 24.12 0.05 0.2656 0.6071 1371 1380 -21.96 0.54 24.28 0.59 0.1739 0.6521 1361 1370 -21.74 0.26 24.12 0.52 -0.0249 0.3278 1351 1360 -21.89 0.26 24.77 0.55 -0.0237 0.8909 1341 1350 -21.74 0.45 24.34 0.55 -0.0796 0.4670 1331 1340 -21.69 0.28 24.74 0.55 -0.2307 0.6630 1321 1330 -21.93 0.50 24.82 0.55 0.0059 0.9665 1311 1320 -21.98 0.43 25.17 0.55 -0.0270 1.2392 1301 1310 -22.21 0.25 24.54 0.55 0.3774 1.0776 1291 1300 -22.11 0.27 24.52 0.26 0.2741 0.9632 1281 1290 -22.20 0.52 25.07 0.96 0.2357 1.4007 1271 1280 -21.89 0.27 25.36 0.53 -0.1708 1.2657 1261 1270 -21.91 0.64 25.16 0.67 -0.0989 1.1580 1251 1260 -21.91 0.54 25.03 0.22 -0.0665 1.0756 1241 1250 -22.13 0.42 24.17 0.90 0.3814 0.7653 1231 1240 -22.71 0.46 24.62 1.06 0.8934 1.6510 1221 1230 -22.32 0.47 24.19 0.45 0.5828 0.9698 1211 1220 -22.81 0.42 24.57 0.47 1.0145 1.7201 1201 1210 -22.78 0.50 25.21 0.56 0.8240 2.0923 1191 1200 -22.94 0.29 24.75 0.68 1.1096 1.9689 1181 1190 -22.94 0.41 24.86 0.82 1.0815 2.0403 1171 1180 -23.03 0.45 24.34 1.10 1.3065 1.8071 1161 1170 -22.93 0.40 25.32 0.48 0.9564 2.3212 1151 1160 -23.19 0.33 24.87 1.00 1.3470 2.3080 1141 1150 -23.12 0.64 24.83 0.53 1.2835 2.2055 1131 1140 -23.13 0.77 24.53 0.71 1.3686 2.0264 1121 1130 -23.00 0.71 24.66 0.62 1.1965 1.9740 1111 1120 -22.66 0.58 24.65 0.77 0.8331 1.6160 1101 1110 -22.55 0.43 24.44 0.74 0.7657 1.3721 1091 1100 -22.72 0.89 23.53 0.72 1.1752 0.9711 1081 1090 -21.95 0.19 23.71 0.78 0.3029 0.2857 1071 1080 -21.97 0.27 23.98 1.01 0.2580 0.4756 1061 1070 -21.88 0.33 24.88 0.55 -0.0620 0.9507 1051 1060 -22.08 0.45 24.24 0.55 0.3115 0.7546 1041 1050 -22.59 0.45 23.38 0.55 1.0725 0.7420 1031 1040 -21.93 0.25 23.28 0.55 0.3883 -0.0074 1021 1030 -22.31 0.32 23.73 0.55 0.6850 0.6718 1011 1020 -22.21 0.27 23.80 0.55 0.5602 0.6120 1001 1010 -22.03 0.50 24.58 0.55 0.1735 0.9173 991 1000 -22.39 0.42 23.48 0.55 0.8328 0.5972 981 990 -22.34 0.49 23.19 0.55 0.8510 0.3621 971 980 -22.20 0.57 24.39 0.55 0.4032 0.9741 961 970 -22.09 0.55 23.26 0.55 0.5651 0.1463 951 960 -22.25 0.55 23.50 0.55 0.6775 0.4642