Nichawak Mountain, Alaska - AK022 Additional Site Information Greg Wiles 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 Reference: Wiles, G. C., D'Arrigo, R.D. and Jacoby, G.C., 1998, Gulf of Alaska atmosphere-ocean variability over recent centuries inferred from coastal tree-ring records: Climatic Change 38, 289-306. COFECHA output: Chronology file name : AK022.CRN Measurement file name : AK022.RWL Date checked : 10MAR05 Checked by : H. ADAMS AND J. LUKAS Beginning year : 1762 Ending year : 1992 Principal investigators: Greg Wiles Site name : Nichawak Mountain Site location : Alaska Species information : PCSI SITKA SPRUCE Latitude : 6015 Longitude : -14358 Elevation : 310M Series intercorrelation: 0.605 Avg mean sensitivity : 0.298 Avg standard deviation : 0.540 Avg autocorrelation : 0.676 Number dated series : 17 Segment length tested : 50 Number problem segments: 2 Pct problem segments : 1.85 PART 5: CORRELATION OF SERIES BY SEGMENTS: ak022.rwl 13:34 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 1775 1800 1825 1850 1875 1900 1925 1950 1824 1849 1874 1899 1924 1949 1974 1999 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 NK01SW 1791 1989 .57 .54 .50 .66 .81 .74 .55 .47 2 NK02SW 1818 1991 .72 .74 .74 .70 .69 .69 .72 3 NK03SW 1916 1991 .53 .55 .69 4 NK05NE 1891 1991 .35 .54 .74 .70 5 NK09SW 1852 1984 .43 .57 .78 .67 .58 6 NK11SW 1849 1991 .37 .44 .70 .61 .56 .55 7 NK12NW 1786 1991 .62 .73 .70 .66 .78 .66 .54 .56 8 NK14SW 1799 1992 .68 .67 .67 .66 .79 .60 .54 .37 9 NK17NW 1861 1990 .64 .73 .76 .48 .34 10 NK17SW 1777 1987 .38 .79 .72 .62 .75 .81 .69 .40 11 NK17NE 1880 1992 .78 .65 .47 .28B 12 NK18SW 1801 1992 .57 .67 .65 .48 .52 .68 .62 13 NK19SW 1834 1991 .81 .79 .81 .59 .37 .25B 14 NK20NA 1762 1968 .45 .77 .74 .69 .63 .59 .56 15 NK20SW 1793 1991 .64 .68 .72 .71 .67 .59 .57 .57 16 NK21SW 1786 1991 .69 .78 .76 .79 .83 .80 .82 .81 17 NK21SE 1827 1984 .79 .76 .81 .65 .65 .68 Av segment correlation .58 .70 .68 .66 .70 .65 .60 .54 PART 7: DESCRIPTIVE STATISTICS: ak022.rwl 13:34 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 NK01SW 1791 1989 199 8 0 .612 .95 4.58 .564 .688 .312 2.94 .439 -.021 1 2 NK02SW 1818 1991 174 7 0 .703 1.49 3.50 .588 .703 .240 2.78 .502 -.050 1 3 NK03SW 1916 1991 76 3 0 .515 1.86 3.70 .622 .695 .203 2.81 .519 .026 1 4 NK05NE 1891 1991 101 4 0 .523 1.01 2.12 .412 .540 .374 2.65 .496 -.018 1 5 NK09SW 1852 1984 133 5 0 .568 1.28 3.31 .691 .745 .308 2.90 .522 -.040 1 6 NK11SW 1849 1991 143 6 0 .502 1.05 3.07 .501 .712 .284 2.82 .475 .014 1 7 NK12NW 1786 1991 206 8 0 .635 1.26 3.49 .540 .654 .274 2.60 .314 -.010 2 8 NK14SW 1799 1992 194 8 0 .597 1.12 3.56 .530 .644 .314 2.69 .376 -.028 1 9 NK17NW 1861 1990 130 5 0 .552 1.80 4.13 .840 .759 .246 2.86 .566 .029 2 10 NK17SW 1777 1987 211 8 0 .579 .75 3.35 .516 .716 .379 3.01 .469 -.063 1 11 NK17NE 1880 1992 113 4 1 .415 1.78 5.28 1.068 .828 .307 2.52 .301 -.052 1 12 NK18SW 1801 1992 192 7 0 .573 .66 2.42 .424 .749 .383 2.69 .459 -.007 1 13 NK19SW 1834 1991 158 6 1 .596 1.01 3.62 .652 .775 .274 2.72 .341 -.038 1 14 NK20NA 1762 1968 207 7 0 .594 1.00 2.49 .396 .694 .252 2.57 .388 .040 4 15 NK20SW 1793 1991 199 8 0 .606 .92 2.19 .351 .630 .257 2.71 .392 .038 1 16 NK21SW 1786 1991 206 8 0 .763 .96 2.57 .384 .519 .316 2.80 .409 .013 1 17 NK21SE 1827 1984 158 6 0 .747 1.26 3.73 .490 .502 .291 2.83 .421 .019 1 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 2800 108 2 .605 1.13 5.28 .540 .676 .298 3.01 .427 -.009