Mountain Lake, Alaska - AK019 Additional Site Information Greg Wiles and Parker E. Calkin Detrending Method: Negative exponontial or linear regression with negative or 0 slope Purpose of Collection: Climatology - temperature analyses Cores located at the Tree Ring Lab, Lamont-Doherty Earth Observatory NOTE: Latitude and Longitude of site corrected 7/18/2012. Correct coordinates are 59.645N, 139.311 W. Previously listed as 59deg 10min North, 139deg 20min West COFECHA output: Chronology file name : AK019.CRN Measurement file name : AK019.RWL Date checked : 10MAR05 Checked by : H. ADAMS AND J. LUKAS Beginning year : 1821 Ending year : 1993 Principal investigators: Greg Wiles, Parker E. Calkin Site name : Mountain Lake Site location : Alaska Species information : PCSI SITKA SPRUCE Latitude : 5939 Longitude : -13919 Elevation : 350M Series intercorrelation: 0.611 Avg mean sensitivity : 0.181 Avg standard deviation : 0.871 Avg autocorrelation : 0.818 Number dated series : 18 Segment length tested : 50 Number problem segments: 1 Pct problem segments : 1.16 PART 5: CORRELATION OF SERIES BY SEGMENTS: ak019.rwl 13:33 Thu 10 Mar 2005 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 1800 1825 1850 1875 1900 1925 1950 1849 1874 1899 1924 1949 1974 1999 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 ML01NW 1882 1993 .60 .64 .72 .70 2 ML02SE 1900 1993 .72 .80 .79 3 ML03NW 1877 1993 .72 .81 .72 .59 4 ML04SW 1874 1993 .77 .73 .74 .66 .69 5 ML05NW 1824 1993 .61 .59 .57 .71 .69 .60 .46 6 ML20NE 1884 1993 .43 .49 .45 .57 7 ML21SE 1850 1993 .41 .48 .42 .48 .38 8 ML22SE 1887 1993 .67 .76 .59 .65 9 ML23SE 1884 1993 .71 .71 .61 .45 10 ML24NW 1899 1993 .61 .63 .53 .53 11 ML25SE 1881 1993 .43 .63 .53 .46 12 ML26NE 1855 1993 .84 .79 .75 .69 .67 13 ML26NW 1845 1993 .69 .75 .79 .77 .69 .70 14 ML27NE 1834 1993 .67 .65 .73 .77 .80 .70 15 ML28NE 1821 1993 .55 .54 .46 .75 .76 .62 .54 16 ML29SE 1853 1993 .63 .73 .74 .47 .23B 17 ML30NW 1887 1993 .73 .67 .64 .45 18 ML30SW 1859 1993 .67 .47 .51 .59 .59 Av segment correlation .58 .62 .64 .65 .68 .62 .56 PART 7: DESCRIPTIVE STATISTICS: ak019.rwl 13:33 Thu 10 Mar 2005 Page 6 ------------------------------------------------------------------------------------------------------------------------------------ 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 ML01NW 1882 1993 112 4 0 .647 2.70 6.54 1.409 .840 .182 2.56 .335 -.008 2 2 ML02SE 1900 1993 94 3 0 .729 3.24 6.36 1.295 .807 .195 2.37 .371 -.092 1 3 ML03NW 1877 1993 117 4 0 .670 2.53 5.76 1.325 .797 .264 2.40 .363 -.017 1 4 ML04SW 1874 1993 120 5 0 .715 2.43 4.35 .824 .804 .150 2.82 .488 -.041 1 5 ML05NW 1824 1993 170 7 0 .595 1.77 3.37 .586 .769 .176 2.75 .458 -.027 1 6 ML20NE 1884 1993 110 4 0 .479 1.84 5.17 .845 .833 .178 2.63 .368 .015 1 7 ML21SE 1850 1993 144 5 0 .396 1.49 2.74 .493 .726 .209 2.51 .394 -.031 2 8 ML22SE 1887 1993 107 4 0 .684 3.11 5.86 1.183 .810 .169 2.62 .483 .071 1 9 ML23SE 1884 1993 110 4 0 .583 3.28 6.52 .895 .729 .148 2.56 .460 -.006 2 10 ML24NW 1899 1993 95 4 0 .581 1.41 3.80 .888 .903 .194 2.67 .383 .029 1 11 ML25SE 1881 1993 113 4 0 .466 2.21 5.20 1.272 .903 .162 2.49 .367 -.037 3 12 ML26NE 1855 1993 139 5 0 .754 1.97 4.43 .802 .782 .212 2.72 .487 .021 1 13 ML26NW 1845 1993 149 6 0 .710 1.78 3.82 .633 .747 .197 2.65 .388 -.012 1 14 ML27NE 1834 1993 160 6 0 .691 2.10 4.83 .966 .853 .169 2.64 .360 .001 1 15 ML28NE 1821 1993 173 7 0 .597 1.44 3.85 .741 .890 .178 2.69 .458 -.014 1 16 ML29SE 1853 1993 141 5 1 .560 1.38 3.40 .753 .923 .148 2.73 .491 -.005 1 17 ML30NW 1887 1993 107 4 0 .596 1.69 3.15 .533 .766 .162 2.68 .469 -.018 1 18 ML30SW 1859 1993 135 5 0 .550 1.79 3.45 .719 .850 .168 2.75 .506 .024 1 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 2296 86 1 .611 2.06 6.54 .871 .818 .181 2.82 .426 -.008