Tebenkof Glacier hemlock A, Alaska - AK167 Additional Site Information David Barclay Greg Wiles Reference: David J. Barclay, Gregory C. Wiles, and Parker E. Calkin. 2009. Tree-ring crossdates for a First Millennium AD advance of Tebenkof Glacier, southern Alaska. Quaternary Research, Vol. 71, Issue 1, pp. 22-26, January 2009. DOI: 10.1016/j.yqres.2008.09.005 Keywords: glacier history, Holocene, Little Ice Age NOTES: This is a composite chronology of living and subfossil samples. Living trees (TBL_) were growing on the east side of the valley while subfossil samples (PW_ and TB_) were from the valley center in till and outwash deposits, pushed into bedrock outcrops, and in modern stream channels. Data were used to reconstruct the late Holocene history of Tebenkof Glacier. Series in the chronology were detrended with 32-year splines. Some living samples previously archived in ITRDB collection AK025. Funding: US National Science Foundation 9912124, 9910805, 9905493 COFECHA output: Chronology file name : AK167.CRN Measurement file name : AK167.RWL Date checked : 03SEP19 Checked by : B. Bauer Beginning year : 957 Ending year : 1991 Principal investigators: David Barclay Greg Wiles Site name : Tebenkof Glacier hemlock A Site location : Alaska Species information : TSME MOUNTAIN HEMLOCK Latitude : 6073 Longitude : -14847 Elevation : 50M Series intercorrelation: 0.599 Avg mean sensitivity : 0.288 Avg standard deviation : 0.357 Avg autocorrelation : 0.750 Number dated series : 55 Segment length tested : 50 Number problem segments: 16 Pct problem segments : 3.86 PART 5: CORRELATION OF SERIES BY SEGMENTS: Tebenkof Glacier hemlock A 16:07 Tue 03 Sep 2019 Page 5 ----------------------------------------------------------------------------------------------------------------------------------- Correlations of 50-year dated segments, lagged 25 years Flags: A = correlation under .3281 but highest as dated; B = correlation higher at other than dated position Seq Series Time_span 1075 1100 1125 1150 1175 1200 1225 1250 1275 1300 1325 1350 1375 1400 1425 1450 1475 1500 1525 1550 1124 1149 1174 1199 1224 1249 1274 1299 1324 1349 1374 1399 1424 1449 1474 1499 1524 1549 1574 1599 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 PW18B 1210 1293 .32B .48 .68 2 PW18C1 1127 1246 .71 .63 .53 .49 3 PW18C2 1153 1240 .63 .66 .70 4 PW18E 1169 1257 .49 .56 .76 .68 5 PW18F1 1114 1285 .59 .84 .76 .74 .74 .70 .64 6 PW18F2 1115 1283 .75 .86 .80 .72 .76 .74 .68 7 PW18G1 1118 1281 .72 .73 .62 .58 .66 .79 .76 8 PW18G2 1119 1287 .76 .75 .69 .69 .82 .83 .64 9 PW25A1 957 1277 .48 .37 .29A .31B .57 .70 .70 .72 10 PW25A2 1088 1254 .56 .39 .50 .58 .60 .69 .67 11 TB01A1 1168 1316 .53 .66 .77 .75 .64 .45 12 TB01A2 1167 1322 .68 .72 .75 .70 .59 .43 13 TB01B1 1120 1281 .52 .54 .62 .62 .62 .61 .54 14 TB01B2 1120 1272 .41B .49 .58 .56 .56 .62 15 TB01E1 1149 1292 .81 .79 .73 .74 .80 .68 16 TB01E2 1148 1295 .49 .45 .41 .75 .78 .55 17 TB02A1 1160 1284 .62 .53 .73 .78 .76 18 TB02A2 1145 1271 .52 .54 .47 .33 .46 19 TB02B1 1146 1284 .61 .65 .60 .74 .81 .69 20 TB02B2 1146 1294 .38 .45 .59 .70 .78 .73 21 TB02C1 1175 1272 .43 .66 .79 22 TB02C2 1210 1284 .59 .68 .63 23 TB13A1 1097 1266 .54 .53 .63 .61 .62 .71 .69 24 TB13A2 1093 1296 .39 .52 .68 .73 .68 .70 .74 .57 25 TB13B 1169 1272 .49 .52 .63 .74 26 TB13K2 1199 1327 .61 .64 .71 .72 .42 .45 27 TB13K5 1123 1307 .77 .74 .56 .48 .62 .73 .61 .46 28 TB13L1 1136 1238 .69 .73 .62 .56 29 TB13L2 1138 1277 .47 .46 .62 .76 .81 .81 30 PW16C 1455 1648 .33 .40 .45 .49 .58 31 PW16E 1543 1650 .48 .56 32 PW17A2 1227 1631 .28A .36 .19B .16B .42 .69 .54 .48 .54 .53 .48 .52 .59 .57 33 PW17B 1498 1645 .48 .44 .46 .45 34 PW24C 1501 1643 .51 .58 .41 35 TB13C1 1468 1639 .37 .37 .49 .62 .71 36 TB13C2 1468 1645 .47 .47 .38 .35B .42 37 TB13D 1539 1620 .63 .58 38 TB13E 1506 1636 .30A .39 .53 39 TB13F1 1439 1653 .47 .46 .38 .50 .56 .60 40 TB13F2 1435 1618 .42 .51 .38 .46 .73 .69 41 TB13J1 1435 1632 .63 .65 .58 .64 .57 .72 42 TB13J2 1435 1638 .30A .56 .49 .55 .67 .74 43 TB13M1 1454 1654 .32A .41 .43 .60 .83 44 TB13M2 1465 1657 .60 .46 .58 .75 .76 45 TBL018 1318 1991 .39 .44 .69 .54 .40 .30A .47 .37 .49 .60 .60 Av segment correlation .49 .58 .62 .60 .60 .66 .70 .65 .39 .33 .43 .69 .54 .44 .44 .48 .44 .48 .57 .61 PART 5: CORRELATION OF SERIES BY SEGMENTS: Tebenkof Glacier hemlock A 16:07 Tue 03 Sep 2019 Page 6 ----------------------------------------------------------------------------------------------------------------------------------- Correlations of 50-year dated segments, lagged 25 years Flags: A = correlation under .3281 but highest as dated; B = correlation higher at other than dated position Seq Series Time_span 1575 1600 1625 1650 1675 1700 1725 1750 1775 1800 1825 1850 1875 1900 1925 1950 1624 1649 1674 1699 1724 1749 1774 1799 1824 1849 1874 1899 1924 1949 1974 1999 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 30 PW16C 1455 1648 .70 .61 31 PW16E 1543 1650 .52 .52 .53 32 PW17A2 1227 1631 .54 .52 33 PW17B 1498 1645 .56 .65 34 PW24C 1501 1643 .19B .29A 35 TB13C1 1468 1639 .79 .79 36 TB13C2 1468 1645 .70 .74 37 TB13D 1539 1620 .59 38 TB13E 1506 1636 .61 .59 39 TB13F1 1439 1653 .71 .32A .22A 40 TB13F2 1435 1618 .79 41 TB13J1 1435 1632 .80 .76 42 TB13J2 1435 1638 .64 .59 43 TB13M1 1454 1654 .77 .70 .70 44 TB13M2 1465 1657 .68 .72 .62 45 TBL018 1318 1991 .65 .79 .78 .63 .69 .69 .57 .60 .63 .57 .55 .63 .53 .52 .67 .68 46 TBL022 1670 1991 .75 .70 .70 .79 .55 .50 .62 .65 .69 .70 .68 .62 .63 47 TBL102 1601 1991 .72 .79 .74 .73 .52 .44 .46 .52 .75 .66 .63 .65 .58 .69 .72 48 TBL134 1736 1991 .61 .56 .57 .67 .75 .80 .81 .76 .68 .63 49 TBL135 1744 1991 .61 .69 .67 .74 .77 .79 .75 .70 .68 .62 50 TBL146 1660 1898 .67 .83 .79 .69 .63 .55 .72 .65 .61 51 TBL208 1628 1991 .66 .68 .83 .86 .75 .58 .47 .63 .61 .65 .75 .65 .75 .77 52 TBL228 1729 1991 .79 .58 .55 .66 .65 .70 .77 .68 .73 .65 53 TBL244 1716 1991 .65 .60 .74 .41 .44 .69 .58 .61 .62 .70 .72 54 TBL248 1736 1991 .75 .60 .52 .67 .72 .67 .76 .66 .68 .73 55 TBL921 1696 1991 .65 .66 .53 .53 .44 .57 .82 .76 .69 .60 .65 .69 Av segment correlation .64 .62 .61 .69 .74 .69 .65 .59 .53 .64 .68 .68 .70 .65 .69 .68 PART 7: DESCRIPTIVE STATISTICS: Tebenkof Glacier hemlock A 16:07 Tue 03 Sep 2019 Page 12 ----------------------------------------------------------------------------------------------------------------------------------- Corr //-------- Unfiltered --------\\ //---- Filtered -----\\ No. No. No. with Mean Max Std Auto Mean Max Std Auto AR Seq Series Interval Years Segmt Flags Master msmt msmt dev corr sens value dev corr () --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- 1 PW18B 1210 1293 84 3 1 .450 1.02 2.02 .319 .763 .169 2.61 .441 -.043 1 2 PW18C1 1127 1246 120 4 0 .607 .79 1.71 .341 .550 .353 2.66 .406 .014 4 3 PW18C2 1153 1240 88 3 0 .691 .79 2.13 .374 .703 .299 2.59 .450 -.012 1 4 PW18E 1169 1257 89 4 0 .560 1.19 2.25 .376 .661 .212 2.63 .443 .011 1 5 PW18F1 1114 1285 172 7 0 .657 .76 2.39 .475 .813 .345 2.82 .470 -.033 1 6 PW18F2 1115 1283 169 7 0 .733 .63 2.05 .382 .714 .373 2.67 .390 -.031 2 7 PW18G1 1118 1281 164 7 0 .689 1.09 4.03 .669 .722 .366 2.85 .465 .020 2 8 PW18G2 1119 1287 169 7 0 .720 .82 2.26 .539 .789 .351 2.56 .385 -.011 1 9 PW25A1 957 1277 321 8 2 .510 .78 2.83 .570 .795 .380 2.69 .380 -.043 2 10 PW25A2 1088 1254 167 7 0 .560 .74 1.97 .441 .690 .357 2.73 .502 .022 1 11 TB01A1 1168 1316 149 6 0 .576 .79 2.50 .601 .940 .183 2.42 .309 -.033 1 12 TB01A2 1167 1322 156 6 0 .601 .68 1.84 .421 .914 .177 2.49 .333 .018 1 13 TB01B1 1120 1281 162 7 0 .572 .74 2.41 .481 .807 .366 2.60 .352 -.022 2 14 TB01B2 1120 1272 153 6 1 .545 1.05 3.02 .498 .730 .298 2.68 .461 .028 2 15 TB01E1 1149 1292 144 6 0 .741 .60 1.28 .261 .620 .292 2.83 .477 .011 1 16 TB01E2 1148 1295 148 6 0 .586 .62 2.18 .515 .852 .348 2.79 .430 .009 1 17 TB02A1 1160 1284 125 5 0 .684 1.02 3.32 .716 .812 .302 2.71 .442 -.060 1 18 TB02A2 1145 1271 127 5 0 .463 1.26 2.76 .503 .582 .295 2.86 .545 .017 2 19 TB02B1 1146 1284 139 6 0 .673 .79 2.05 .436 .881 .211 2.56 .440 -.037 1 20 TB02B2 1146 1294 149 6 0 .583 .66 1.92 .396 .883 .228 2.60 .421 -.047 1 21 TB02C1 1175 1272 98 3 0 .626 .94 2.35 .423 .742 .228 2.63 .485 -.018 1 22 TB02C2 1210 1284 75 3 0 .609 .57 1.45 .289 .738 .273 2.70 .496 .099 1 23 TB13A1 1097 1266 170 7 0 .618 .98 3.16 .654 .849 .341 2.57 .364 -.010 1 24 TB13A2 1093 1296 204 8 0 .607 .71 2.62 .429 .778 .334 2.79 .422 -.034 1 25 TB13B 1169 1272 104 4 0 .616 .93 1.43 .193 .511 .173 2.71 .544 .035 1 26 TB13K2 1199 1327 129 6 0 .566 1.24 2.87 .478 .715 .207 2.68 .421 -.019 3 27 TB13K5 1123 1307 185 8 0 .599 1.01 2.70 .511 .798 .261 2.88 .456 -.021 2 28 TB13L1 1136 1238 103 4 0 .624 1.27 2.54 .492 .734 .239 2.75 .428 .001 1 29 TB13L2 1138 1277 140 6 0 .657 .76 2.42 .460 .831 .279 2.59 .394 -.001 1 30 PW16C 1455 1648 194 7 0 .512 .73 1.68 .257 .599 .247 2.57 .387 .004 1 31 PW16E 1543 1650 108 5 0 .492 .72 1.58 .263 .668 .215 2.55 .453 .027 1 32 PW17A2 1227 1631 405 16 3 .433 .20 .91 .138 .686 .336 3.04 .419 -.015 1 33 PW17B 1498 1645 148 6 0 .511 .78 1.63 .297 .716 .219 2.60 .453 .020 1 34 PW24C 1501 1643 143 5 2 .391 .76 1.59 .320 .716 .253 2.77 .425 .037 1 35 TB13C1 1468 1639 172 7 0 .591 .75 2.68 .423 .717 .302 2.91 .503 .046 1 36 TB13C2 1468 1645 178 7 1 .507 .68 2.30 .387 .886 .208 2.65 .343 -.001 1 37 TB13D 1539 1620 82 3 0 .632 .81 1.65 .323 .668 .260 2.81 .520 -.017 1 38 TB13E 1506 1636 131 5 1 .466 1.37 3.38 .705 .729 .304 2.86 .436 .001 1 39 TB13F1 1439 1653 215 9 2 .425 .53 2.18 .416 .810 .250 2.53 .307 -.021 1 40 TB13F2 1435 1618 184 7 0 .538 .59 2.62 .432 .836 .306 2.60 .316 -.012 1 41 TB13J1 1435 1632 198 8 0 .637 .45 2.79 .425 .873 .355 2.64 .401 .000 1 42 TB13J2 1435 1638 204 8 1 .487 .50 1.70 .328 .809 .323 2.60 .374 -.009 4 43 TB13M1 1454 1654 201 8 1 .600 .61 1.63 .333 .839 .261 2.41 .275 -.059 2 44 TB13M2 1465 1657 193 8 0 .645 .66 1.77 .318 .793 .245 2.88 .412 -.097 1 45 TBL018 1318 1991 674 27 1 .569 .39 .88 .159 .802 .212 2.49 .299 -.003 9 46 TBL022 1670 1991 322 13 0 .665 .67 2.17 .393 .790 .306 2.62 .356 .006 8 47 TBL102 1601 1991 391 15 0 .643 .61 2.29 .314 .775 .291 2.47 .274 -.015 3 48 TBL134 1736 1991 256 10 0 .674 .49 1.22 .214 .632 .318 2.68 .298 .007 1 PART 7: DESCRIPTIVE STATISTICS: Tebenkof Glacier hemlock A 16:07 Tue 03 Sep 2019 Page 13 ----------------------------------------------------------------------------------------------------------------------------------- Corr //-------- Unfiltered --------\\ //---- Filtered -----\\ No. No. No. with Mean Max Std Auto Mean Max Std Auto AR Seq Series Interval Years Segmt Flags Master msmt msmt dev corr sens value dev corr () --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- 49 TBL135 1744 1991 248 10 0 .684 .51 1.40 .210 .625 .313 2.54 .350 .037 1 50 TBL146 1660 1898 239 9 0 .686 .48 1.66 .286 .833 .297 2.46 .314 -.021 6 51 TBL208 1628 1991 364 14 0 .696 .47 1.69 .249 .711 .310 2.66 .457 .007 3 52 TBL228 1729 1991 263 10 0 .681 .44 1.01 .154 .697 .230 2.53 .328 -.017 1 53 TBL244 1716 1991 276 11 0 .597 .48 1.52 .235 .687 .309 2.69 .406 .004 1 54 TBL248 1736 1991 256 10 0 .681 .47 1.38 .212 .569 .314 2.76 .344 -.044 1 55 TBL921 1696 1991 296 12 0 .631 .45 1.14 .215 .701 .325 2.75 .428 .005 3 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 10544 415 16 .599 .67 4.03 .357 .750 .288 3.04 .390 -.008