Skookum Butte, Oregon - OR053 Additional Site Information James H. Speer and Thomas W. Swetnam Purpose of Collection: Ecology - insect outbreaks Detrend method: 40-year cubic smoothing spline Cores are stored at Laboratory of Tree-Ring Research, Tucson, AZ. This site was collected for a pandora moth outbreak study. We were able to demonstrate that much of the variance in the tree cores was explained by the effects of pandora moth defoliation, therefore, this chronology would not be useful for climate reconstruction. We used a 40-year cubic smoothing spline on the cores to remove long-term climate fluctuations and age trends. References: Speer, J.H. 1997. A dendrochronological record of pandora moth (Coloradia pandora, Blake) outbreaks in central Oregon. MS thesis, The Univeristy of Arizona. Tucson, 159pp. Speer, J.H., Swetnam, T.W., Wickman, B.E., and Youngblood, A., 2000. Changes in pandora moth outbreak dynamics during the past 622 years. Submitted to Ecology. COFECHA output: Chronology file name : OR053.CRN Measurement file name : OR053.RWL Date checked : 29MAR05 Checked by : H. ADAMS AND J. LUKAS Beginning year : 1639 Ending year : 1995 Principal investigators: James H. Speer and Thomas W. Swetnam Site name : Skookum Butte Site location : Oregon Species information : PIPO PONDEROSA PINE Latitude : +4314 Longitude : -12139 Elevation : 1670M Series intercorrelation: 0.445 Avg mean sensitivity : 0.212 Avg standard deviation : 0.743 Avg autocorrelation : 0.837 Number dated series : 19 Segment length tested : 50 Number problem segments: 30 Pct problem segments : 22.90 PART 5: CORRELATION OF SERIES BY SEGMENTS: or053.rwl 13:13 Tue 29 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 1650 1675 1700 1725 1750 1775 1800 1825 1850 1875 1900 1925 1950 1699 1724 1749 1774 1799 1824 1849 1874 1899 1924 1949 1974 1999 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 SKB01A 1639 1994 .34B .39 .30A .51 .50 .52 .47B .18B .44 .53 .24B .23B .35 2 SKB01B 1665 1994 .53B .58 .61 .49 .28B .39 .48 .29A .24B .18B .06B .35B .55 3 SKB03B 1852 1995 .36B .39 .50 .69 .74 4 SKB04A 1864 1995 .53 .56 .48 .54 .58 5 SKB04B 1853 1995 .60 .68 .69 .77 .69 6 SKB05A 1867 1995 .39 .51 .63 .66 .69 7 SKB05B 1870 1995 .27B .36 .34 .29B .39 8 SKB06A 1887 1995 .61 .50 .48 .61 9 SKB06B 1855 1995 .48 .50 .29A .42 .56 10 SKB07A 1805 1995 .37B .43 .36 .52 .50 .19A .22B 11 SKB07B 1845 1995 .51 .54 .51 .46 .48 .41 12 SKB08A 1887 1995 .54 .40 .51 .44 13 SKB08B 1867 1995 .53 .61 .56 .67 .64 14 SKB09A 1855 1995 .41 .38 .39 .65 .61 15 SKB09B 1859 1995 .39B .52 .55 .64 .65 16 SKB10A 1702 1995 .10B .50 .44 .19B .28A .55 .71 .64 .41 .52 .60 17 SKB10B 1739 1995 .49 .38 .36 .67 .64 .70 .74 .39 .32B .40B 18 SKB11A 1768 1995 .41 .48 .52 .38B .18B .34 .44 .49 .44 19 SKB11B 1770 1995 .46 .44 .45 .18B .25A .38 .40 .47 .41 Av segment correlation .43 .48 .34 .50 .41 .40 .46 .40 .44 .50 .43 .49 .53 PART 7: DESCRIPTIVE STATISTICS: or053.rwl 13:13 Tue 29 Mar 2005 Page 7 ------------------------------------------------------------------------------------------------------------------------------------ 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 SKB01A 1639 1994 356 13 6 .393 .60 1.41 .247 .783 .229 2.59 .315 .008 2 2 SKB01B 1665 1994 330 13 7 .380 .47 1.48 .213 .820 .216 2.59 .332 -.017 1 3 SKB03B 1852 1995 144 5 1 .512 2.35 6.41 1.138 .831 .212 2.88 .462 .010 1 4 SKB04A 1864 1995 132 5 0 .545 2.10 4.17 1.021 .877 .185 2.52 .456 .020 1 5 SKB04B 1853 1995 143 5 0 .646 2.23 5.28 1.337 .946 .161 2.45 .344 -.028 1 6 SKB05A 1867 1995 129 5 0 .587 2.03 4.79 .958 .802 .237 2.71 .461 -.052 1 7 SKB05B 1870 1995 126 5 2 .327 1.92 5.30 1.058 .878 .205 2.63 .448 -.043 2 8 SKB06A 1887 1995 109 4 0 .591 1.39 5.43 1.157 .960 .196 2.51 .374 -.062 1 9 SKB06B 1855 1995 141 5 1 .440 2.59 9.13 1.754 .951 .153 2.48 .360 -.045 1 10 SKB07A 1805 1995 191 7 3 .335 1.05 2.68 .552 .833 .220 2.60 .415 -.033 1 11 SKB07B 1845 1995 151 6 0 .470 1.27 2.91 .699 .852 .210 2.60 .472 -.040 1 12 SKB08A 1887 1995 109 4 0 .505 1.27 3.12 .644 .890 .173 2.62 .493 -.085 1 13 SKB08B 1867 1995 129 5 0 .574 1.98 3.96 .780 .819 .170 2.45 .362 -.079 1 14 SKB09A 1855 1995 141 5 0 .443 1.69 4.90 .954 .852 .244 2.62 .366 .022 1 15 SKB09B 1859 1995 137 5 1 .505 1.78 5.20 .935 .900 .176 2.55 .427 -.036 1 16 SKB10A 1702 1995 294 11 3 .357 1.32 3.34 .671 .890 .182 2.62 .361 -.005 1 17 SKB10B 1739 1995 257 10 2 .519 1.22 4.16 .683 .911 .173 2.61 .389 -.034 2 18 SKB11A 1768 1995 228 9 2 .364 1.31 2.74 .577 .639 .303 2.53 .312 -.017 1 19 SKB11B 1770 1995 226 9 2 .358 1.43 3.49 .687 .707 .294 2.80 .454 .000 3 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 3473 131 30 .445 1.42 9.13 .743 .837 .212 2.88 .388 -.022