Ptarmigan Hill, Alaska, USA - AK069 Additional Site Information Rosanne D'Arrigo, Erika Mashig, David Frank, Rob Wilson and Gordon Jacoby. Purpose of Collection: Climate analysis Measurement type: Total ring width Location of core material: Tree-Ring Laboratory Lamont-Doherty Earth Observatory Palisades, New York 10964 Reference: D'Arrigo, R., E. Mashig, D. Frank, R. Wilson and G. Jacoby. 2005. Temperature Variability over the past millennium inferred from northwestern Alaska tree rings. Climate Dynamics 24: 227-236. doi:10.1007/s00382-004-0502-1. COFECHA output: Chronology file name : AK069.CRN Measurement file name : AK069.RWL Date checked : 13JAN06 Checked by : B. Bauer Beginning year : 1718 Ending year : 2002 Principal investigators: R. D'Arrigo E. Mashig D. Frank R. Wilson G. Jacoby Site name : Ptarmigan Hill Site location : Alaska Species information : PCGL WHITE SPRUCE Latitude : +6504 Longitude : -16214 Elevation : 244M Series intercorrelation: 0.614 Avg mean sensitivity : 0.218 Avg standard deviation : 0.361 Avg autocorrelation : 0.857 Number dated series : 34 Segment length tested : 50 Number problem segments: 11 Pct problem segments : 4.47 PART 5: CORRELATION OF SERIES BY SEGMENTS: Ptarmigan Hill 12:20 Fri 13 Jan 2006 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 1725 1750 1775 1800 1825 1850 1875 1900 1925 1950 1975 1774 1799 1824 1849 1874 1899 1924 1949 1974 1999 2024 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 PH01a 1790 2002 .34 .42 .33 .58 .79 .83 .69 .59 .53 2 PH01b 1795 2002 .24A .26A .41B .49 .70 .84 .80 .71 .68 3 PH02a 1846 2002 .54 .74 .81 .68 .60 .57 .54 4 PH02b 1864 2002 .45 .64 .64 .66 .48 .47 5 PH03a 1794 2002 .52 .47 .41 .60 .82 .73 .57 .36 .33A 6 PH03b 1835 2002 .44 .46 .77 .68 .50 .37 .34 7 PH04a 1735 1952 .65 .53 .58 .55 .58 .66 .66 .33B .34B 8 PH04b 1741 1911 .52 .44 .62 .58 .60 .60 .56 9 PH05a 1815 2002 .52 .77 .80 .64 .56 .66 .43 .40 10 PH05b 1794 2002 .31A .39 .60 .74 .75 .70 .61 .60 .59 11 PH06a 1750 2002 .28B .53 .60 .53 .64 .73 .62 .54 .56 .49 12 PH06b 1750 2002 .33 .43B .53 .58 .76 .72 .62 .65 .63 .63 13 PH07a 1847 2002 .50 .45 .55 .72 .84 .85 .84 14 PH07b 1847 2002 .36 .36 .51 .73 .75 .71 .71 15 PH08a 1858 2002 .71 .82 .83 .75 .66 .69 16 PH08b 1845 2002 .69 .76 .81 .83 .83 .76 .76 17 PH09a 1863 2002 .58 .72 .82 .77 .65 .61 18 PH09b 1863 2002 .67 .77 .77 .76 .80 .70 19 PH10a 1826 2002 .68 .74 .63 .62 .73 .48 .45 20 PH10b 1817 2002 .50 .54 .67 .80 .78 .59 .49 .51 21 PH11a 1762 1968 .32A .47 .51 .64 .69 .80 .74 .67 22 PH11b 1786 1976 .38B .46 .72 .75 .73 .60 .47 .46 23 PH12a 1718 2002 .75 .64 .66 .58 .55 .68 .77 .68 .38 .45 .42 24 PH14a 1800 1915 .53 .68 .69 .70 25 PH14b 1800 1939 .50 .58 .64 .65 .41 26 PH16a 1842 2002 .63 .77 .78 .70 .65 .55 .55 27 PH16b 1842 2002 .75 .81 .89 .88 .74 .55 .56 28 PH18a 1862 2002 .62 .68 .81 .75 .71 .69 29 PH18b 1800 2002 .49 .69 .77 .77 .82 .78 .64 .66 30 PH19a 1888 2002 .75 .76 .73 .55 .54 31 PH19b 1858 2002 .54 .58 .62 .40 .45 .43 32 PH19c 1890 2002 .55 .43 .41 .55 .53 33 PH20a 1858 2002 .52 .69 .70 .74 .61 .59 34 PH20b 1858 2002 .76 .77 .70 .68 .62 .61 Av segment correlation .64 .42 .46 .49 .57 .65 .71 .69 .65 .58 .57 PART 7: DESCRIPTIVE STATISTICS: Ptarmigan Hill 12:20 Fri 13 Jan 2006 Page 8 ----------------------------------------------------------------------------------------------------------------------------------- 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 PH01a 1790 2002 213 9 0 .569 .68 1.76 .314 .747 .260 2.67 .420 -.016 2 2 PH01b 1795 2002 208 9 3 .605 .56 1.94 .265 .792 .232 2.82 .518 -.031 2 3 PH02a 1846 2002 157 7 0 .641 .50 1.57 .312 .863 .218 2.69 .423 -.039 1 4 PH02b 1864 2002 139 6 0 .517 .44 1.55 .304 .926 .253 2.46 .458 -.005 2 5 PH03a 1794 2002 209 9 1 .560 .68 2.30 .388 .884 .202 2.61 .385 -.043 4 6 PH03b 1835 2002 168 7 0 .510 .36 1.07 .211 .869 .240 2.68 .387 -.005 1 7 PH04a 1735 1952 218 9 2 .532 .52 1.56 .280 .839 .215 2.68 .335 -.052 2 8 PH04b 1741 1911 171 7 0 .552 .55 1.53 .236 .747 .211 2.83 .426 -.059 2 9 PH05a 1815 2002 188 8 0 .586 1.11 2.23 .390 .756 .181 2.76 .428 -.068 1 10 PH05b 1794 2002 209 9 1 .599 .82 2.09 .448 .887 .198 2.50 .340 -.031 3 11 PH06a 1750 2002 253 10 1 .541 .40 1.59 .297 .900 .232 2.98 .443 -.059 1 12 PH06b 1750 2002 253 10 1 .606 .49 1.28 .291 .907 .218 2.73 .368 -.021 5 13 PH07a 1847 2002 156 7 0 .662 .78 1.44 .232 .693 .190 2.54 .379 -.031 1 14 PH07b 1847 2002 156 7 0 .575 .78 1.47 .237 .680 .192 2.68 .453 -.040 1 15 PH08a 1858 2002 145 6 0 .745 .75 2.11 .427 .913 .193 2.80 .502 .001 1 16 PH08b 1845 2002 158 7 0 .789 .91 2.17 .475 .890 .194 2.47 .381 -.053 2 17 PH09a 1863 2002 140 6 0 .660 .94 2.07 .352 .757 .191 2.52 .367 -.037 2 18 PH09b 1863 2002 140 6 0 .714 1.11 3.09 .550 .825 .199 2.67 .552 -.087 3 19 PH10a 1826 2002 177 7 0 .621 .60 1.77 .415 .942 .201 2.61 .382 -.013 1 20 PH10b 1817 2002 186 8 0 .601 .56 1.69 .413 .920 .209 2.55 .304 -.032 1 21 PH11a 1762 1968 207 8 1 .608 .71 2.10 .450 .900 .213 3.00 .474 -.047 1 22 PH11b 1786 1976 191 8 1 .575 .78 1.96 .491 .905 .215 2.90 .504 -.002 1 23 PH12a 1718 2002 285 11 0 .625 .33 1.54 .280 .905 .314 2.58 .299 -.021 2 24 PH14a 1800 1915 116 4 0 .650 .92 2.25 .356 .718 .207 2.92 .528 -.062 1 25 PH14b 1800 1939 140 5 0 .493 .70 2.06 .520 .938 .173 2.71 .453 -.023 1 26 PH16a 1842 2002 161 7 0 .677 .68 2.40 .395 .868 .228 2.60 .354 -.042 2 27 PH16b 1842 2002 161 7 0 .767 .62 2.23 .452 .922 .234 2.58 .379 -.043 2 28 PH18a 1862 2002 141 6 0 .712 .62 2.02 .488 .941 .243 2.86 .504 -.061 1 29 PH18b 1800 2002 203 8 0 .695 .70 1.93 .498 .926 .211 2.53 .426 -.099 1 30 PH19a 1888 2002 115 5 0 .670 .57 1.06 .162 .673 .188 2.52 .503 -.080 1 31 PH19b 1858 2002 145 6 0 .533 .50 1.78 .314 .881 .226 2.64 .366 -.061 1 32 PH19c 1890 2002 113 5 0 .510 .33 .77 .143 .842 .206 2.51 .363 -.046 1 33 PH20a 1858 2002 145 6 0 .608 .75 1.88 .462 .933 .192 2.56 .406 .006 2 34 PH20b 1858 2002 145 6 0 .689 .65 1.94 .461 .897 .223 2.49 .376 -.019 2 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 5912 246 11 .614 .65 3.09 .361 .857 .218 3.00 .412 -.038