Steen's Mountain, Oregon Recollection - OR063 Additional Site Information Dave Meko Chronology from merged sets of cores from 1998 collection by Meko and Baisan and earlier (1980s ) collections of H.C. Fritts. Ringwidths detrended by ratio method (Cook et al. 1990). Automated choice of dtrending curves. Order of preference: (1) monotonic non-increasing cubic smoothing spline, (2) least-squares-fit straight line of negative slope, and (3) horizontal line at mean of ring width. The horizontal line is equivalent to no detrending. Spline fit by trial and error, incrementally increasing the spline parameter (Cook and Peters 1981) while monitoring first and second derivatives of the fitted spline at each iteration. Spline initially set very stiff (approximately straight line), and allowed to become more flexible as spline parameter increased. Iteration stopped when either of two conditions on first two derivatives of fitted spline violated: (1) first derivative (slope) must be negative everywhere, and (2) second derivative (curvature) must be positive throughout the second half of the series. If most flexible possible spline satisfying the above conditions so stiff that the amplitude of frequency response at a wavelength twice the series length is less than 0.5, series detrended with a least-squares-fit straight line. If slope of the fitted spline or straight line positive, a horizontal line at the ring-width mean used as the "age trend" (effectively no detrending). Plots of ring width and overlaid selected detrending curves viewed subsequently for optional manual overide of automatic curve selections or manual specification of fit period less than entire series length. Final selected detrending curves listed in table below. After the trend line fit, core indices computed as the ratio of ringwidth to trend line. Core indices then averaged to get tree indices, and tree indices averaged to get site index, or standard chronology. Averaging of tree indices for a given year by arithmetic mean if fewer than 6 trees; otherwise by bi-weight mean. Residual chronology computed in same way as standard chronology except that autoregressive residuals of core indices used in place of core indices. The "sample size" listed in attached ".crn" files is the number of TREES sampled each year, not the number of cores. N Core Fit Period Curve fit Persistence 1 STE19C 1501 1982 CS(482 yr) AR(3) 0.26 2 STE19E 1549 1982 CS(838 yr) AR(3) 0.28 3 STE19G 1530 1982 CS(634 yr) AR(3) 0.35 4 STE19H 1516 1982 CS(528 yr) AR(2) 0.29 5 STE25A 1748 1982 SL AR(3) 0.34 6 STE25B 1747 1982 CS(425 yr) AR(3) 0.31 7 STE25C 1596 1982 HL AR(2) 0.18 8 STE27A 1618 1982 CS(577 yr) AR(3) 0.31 9 STE27B 1595 1982 HL AR(3) 0.47 10 STE35A 1745 1982 SL AR(3) 0.44 11 STE35B 1632 1889 HL AR(3) 0.23 12 STE53A 1361 1905 SL AR(3) 0.26 13 STE54A 1939 1998 SL AR(1) 0.17 14 STE54B 1622 1998 CS(283 yr) AR(2) 0.41 15 STE54C 1451 1925 CS(266 yr) AR(2) 0.31 16 STE57A 1400 1937 CS(866 yr) AR(3) 0.35 17 STE58A 1387 1915 HL AR(3) 0.32 18 STE59A 1371 1749 SL AR(2) 0.26 19 STE59B 1529 1998 CS(790 yr) AR(3) 0.36 20 STE60A 1017 1738 SL AR(3) 0.41 21 STE60B 1194 1616 SL AR(3) 0.45 22 STE60C 1742 1998 HL AR(2) 0.54 23 STE60D 1746 1998 HL AR(3) 0.50 24 STE61A 1418 1960 HL AR(3) 0.31 25 STE63A 1714 1998 HL AR(3) 0.37 26 STE65A 1411 1920 CS(434 yr) AR(3) 0.11 27 STE65C 1408 1916 HL AR(3) 0.21 28 STE66A 1285 1816 CS(495 yr) AR(3) 0.19 29 STE66B 1280 1998 CS(1100 yr) AR(3) 0.25 Fit Period = period of ring width used in curve fitting * = differs from full available period of ring width data Curve Fit = type of model used to detrend ring width NE=modified negative exponential SL=least-square-fit straight line HL=horizontal line at mean of ring width for fit period CS=cubic smoothing spline (wavelength of 50% frequency reponse in parentheses) Persistence = autoregressive prewhitening information AR(q) = order q of autoregressive model fit to core index nn = decimal proportion of core-index variance due to persistence; computed as 1-R, where R is the ratio of variance of residual index to variance of standard index References: Cook, E.R., Briffa, K., Shiyatov, S., Mazepa, V. 1990. Tree- ring standardization and growth-trend estimation. In: Methods of dendrochronology, applications in the environmental sciences. Kluwer Academic Press, Boston, 104-123. Cook, E.R., Peters, K., 1981. The smoothing spline: a new approach to standardizing forest interior tree-ring width series for dendroclimatic studies. Tree Ring Bulletin, 41, p. 45-53 Meko, D.M., M. D. Therrell, C. H. Baisan, and M. K. Hughes, 2001, Sacramento River Flow Reconstructed to A.D. 869 From Tree Rings, Journal of the American Water Resources Association, v.37, No.4, August 2001. Meko, D. M., 2001. Reconstructed Sacramento River system runoff from tree rings, Report prepared for the California Department of Water Resources under Agreement No. B81923-SAP # 4600000193. Available from: California Department of Water Resources, P.O. Box 942836, Room 1601, Sacramento, CA 94236-0001. 63 pp. COFECHA output: Chronology file name : OR063.CRN Measurement file name : OR063.RWL Date checked : 29MAR05 Checked by : H. ADAMS AND J. LUKAS Beginning year : 1017 Ending year : 1998 Principal investigators: MEKO,BAISAN,FUNKHOUSER,DAI Site name : STEENS MOUNTAIN OCT1998 Site location : OREGON Species information : JUOC WESTERN JUNIPER Latitude : +4240 Longitude : -11855 Elevation : 1460M Series intercorrelation: 0.721 Avg mean sensitivity : 0.374 Avg standard deviation : 0.257 Avg autocorrelation : 0.598 Number dated series : 29 Segment length tested : 50 Number problem segments: 1 Pct problem segments : 0.21 PART 5: CORRELATION OF SERIES BY SEGMENTS: or063.rwl 13:16 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 1175 1200 1225 1250 1275 1300 1325 1350 1375 1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1224 1249 1274 1299 1324 1349 1374 1399 1424 1449 1474 1499 1524 1549 1574 1599 1624 1649 1674 1699 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 STE19C 1501 1982 .50 .72 .75 .79 .84 .69 .51 2 STE19E 1549 1982 .71 .71 .84 .89 .66 .47 3 STE19G 1530 1982 .77 .74 .83 .87 .76 .60 4 STE19H 1516 1982 .68 .71 .65 .80 .85 .73 .53 7 STE25C 1596 1982 .83 .82 .78 .81 8 STE27A 1618 1982 .70 .66 .74 9 STE27B 1595 1982 .58 .56 .74 .63 11 STE35B 1632 1889 .79 .75 12 STE53A 1361 1905 .71 .80 .79 .67 .57 .52 .63 .76 .61 .62 .64 .66 .75 14 STE54B 1622 1998 .77 .58 .59 15 STE54C 1451 1925 .57 .72 .69 .57 .67 .81 .81 .77 .74 16 STE57A 1400 1937 .84 .84 .79 .84 .85 .77 .78 .72 .71 .75 .74 17 STE58A 1387 1915 .53 .63 .54 .48 .68 .85 .84 .62 .72 .86 .82 .77 18 STE59A 1371 1749 .70 .70 .87 .80 .74 .77 .80 .70 .70 .75 .75 .73 .70 19 STE59B 1529 1998 .58 .54 .73 .80 .70 .64 20 STE60A 1017 1738 .68 .69 .68 .83 .77 .64 .72 .83 .72 .59 .65 .66 .73 .83 .77 .70 .86 .92 .78 .74 21 STE60B 1194 1616 .68 .69 .68 .83 .73 .62 .79 .85 .84 .80 .72 .70 .79 .89 .85 .83 .89 24 STE61A 1418 1960 .41 .47 .49 .54 .64 .75 .81 .85 .81 .67 .70 26 STE65A 1411 1920 .79 .74 .69 .76 .67 .66 .72 .69 .73 .82 .87 27 STE65C 1408 1916 .75 .74 .73 .81 .74 .65 .73 .65 .63 .69 .74 28 STE66A 1285 1816 .68 .65 .79 .85 .80 .80 .83 .81 .82 .83 .82 .80 .76 .74 .82 .84 29 STE66B 1280 1998 .51 .53 .71 .74 .78 .85 .86 .84 .86 .89 .86 .89 .85 .82 .83 .85 Av segment correlation .68 .69 .68 .83 .67 .61 .75 .78 .74 .74 .71 .67 .74 .75 .73 .72 .77 .78 .73 .70 PART 5: CORRELATION OF SERIES BY SEGMENTS: or063.rwl 13:16 Tue 29 Mar 2005 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 1675 1700 1725 1750 1775 1800 1825 1850 1875 1900 1925 1950 1724 1749 1774 1799 1824 1849 1874 1899 1924 1949 1974 1999 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 STE19C 1501 1982 .68 .81 .71 .66 .62 .64 .75 .66 .63 .77 .79 .73 2 STE19E 1549 1982 .65 .80 .67 .69 .66 .56 .69 .76 .77 .80 .81 .79 3 STE19G 1530 1982 .71 .84 .64 .53 .59 .66 .73 .67 .66 .84 .87 .83 4 STE19H 1516 1982 .69 .84 .63 .61 .75 .69 .74 .76 .61 .74 .78 .66 5 STE25A 1748 1982 .60 .60 .77 .75 .77 .79 .84 .68 .59 .48 6 STE25B 1747 1982 .69 .69 .82 .66 .71 .85 .86 .82 .63 .57 7 STE25C 1596 1982 .78 .76 .77 .84 .89 .83 .81 .84 .86 .89 .72 .68 8 STE27A 1618 1982 .76 .79 .82 .78 .81 .75 .67 .73 .82 .85 .80 .79 9 STE27B 1595 1982 .60 .74 .74 .72 .67 .64 .76 .80 .79 .75 .70 .68 10 STE35A 1745 1982 .79 .80 .78 .75 .77 .62 .27B .34 .43 .55 11 STE35B 1632 1889 .62 .46 .53 .63 .73 .75 .73 .64 12 STE53A 1361 1905 .70 .71 .63 .51 .58 .72 .79 .84 .84 13 STE54A 1939 1998 .58 .77 14 STE54B 1622 1998 .77 .83 .73 .59 .64 .77 .81 .75 .68 .46 .50 .65 15 STE54C 1451 1925 .79 .81 .81 .57 .60 .72 .70 .63 .60 .65 16 STE57A 1400 1937 .81 .82 .79 .74 .74 .84 .83 .78 .77 .63 17 STE58A 1387 1915 .76 .59 .47 .65 .74 .73 .82 .79 .74 18 STE59A 1371 1749 .71 .55 19 STE59B 1529 1998 .69 .71 .62 .65 .77 .75 .77 .81 .75 .81 .72 .72 20 STE60A 1017 1738 .68 .57 22 STE60C 1742 1998 .53 .67 .77 .81 .78 .77 .82 .82 .82 .90 23 STE60D 1746 1998 .52 .55 .74 .73 .72 .77 .77 .77 .82 .87 24 STE61A 1418 1960 .78 .79 .74 .62 .65 .75 .78 .81 .79 .73 .63 25 STE63A 1714 1998 .64 .60 .72 .66 .65 .65 .66 .71 .75 .53 .59 26 STE65A 1411 1920 .79 .61 .60 .76 .86 .73 .72 .84 .80 27 STE65C 1408 1916 .64 .63 .66 .65 .75 .78 .73 .79 .82 28 STE66A 1285 1816 .79 .73 .69 .80 .83 29 STE66B 1280 1998 .82 .79 .70 .71 .79 .77 .74 .82 .86 .70 .64 .77 Av segment correlation .73 .72 .67 .67 .73 .73 .75 .76 .74 .73 .69 .71 PART 7: DESCRIPTIVE STATISTICS: or063.rwl 13:16 Tue 29 Mar 2005 Page 11 ------------------------------------------------------------------------------------------------------------------------------------ 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 STE19C 1501 1982 482 19 0 .682 .64 1.61 .272 .665 .318 2.56 .388 -.023 1 2 STE19E 1549 1982 434 18 0 .720 .69 1.98 .287 .612 .313 2.61 .402 -.044 1 3 STE19G 1530 1982 453 18 0 .723 .77 2.24 .333 .675 .300 2.61 .354 -.014 1 4 STE19H 1516 1982 467 19 0 .697 .70 1.93 .305 .658 .316 2.65 .399 -.023 1 5 STE25A 1748 1982 235 10 0 .690 .49 1.13 .164 .583 .268 2.51 .380 .012 1 6 STE25B 1747 1982 236 10 0 .719 .44 .91 .154 .498 .312 2.54 .352 -.017 1 7 STE25C 1596 1982 387 16 0 .802 .52 1.22 .171 .360 .320 2.61 .328 -.011 1 8 STE27A 1618 1982 365 15 0 .760 .38 1.19 .198 .565 .408 2.75 .380 .047 1 9 STE27B 1595 1982 388 16 0 .687 .40 1.04 .192 .636 .367 2.62 .360 .005 1 10 STE35A 1745 1982 238 10 1 .619 .63 1.69 .306 .639 .360 2.65 .461 -.055 1 11 STE35B 1632 1889 258 10 0 .676 .44 1.57 .217 .436 .446 2.60 .420 -.028 1 12 STE53A 1361 1905 545 22 0 .676 .25 .76 .132 .368 .514 2.69 .442 .006 1 13 STE54A 1939 1998 60 2 0 .734 1.30 2.35 .425 .693 .210 2.41 .419 -.063 1 14 STE54B 1622 1998 377 15 0 .677 .52 1.82 .350 .852 .373 2.47 .269 .004 1 15 STE54C 1451 1925 475 19 0 .692 .50 1.79 .360 .866 .373 2.65 .437 .023 1 16 STE57A 1400 1937 538 21 0 .771 .58 1.77 .277 .645 .326 2.57 .319 .006 1 17 STE58A 1387 1915 529 21 0 .694 .30 1.12 .150 .525 .407 2.66 .296 .001 1 18 STE59A 1371 1749 379 15 0 .716 .90 2.37 .448 .702 .308 2.60 .350 .006 1 19 STE59B 1529 1998 470 18 0 .709 .44 1.20 .208 .628 .344 2.62 .357 .005 3 20 STE60A 1017 1738 722 22 0 .739 .44 1.45 .236 .607 .417 2.83 .369 -.008 1 21 STE60B 1194 1616 423 17 0 .783 .75 2.06 .376 .721 .314 2.60 .320 -.004 2 22 STE60C 1742 1998 257 10 0 .780 .52 1.67 .335 .706 .416 2.56 .325 -.003 1 23 STE60D 1746 1998 253 10 0 .750 .43 1.58 .273 .666 .410 2.92 .390 .009 1 24 STE61A 1418 1960 543 22 0 .697 .41 1.20 .193 .513 .414 2.75 .354 -.012 1 25 STE63A 1714 1998 285 11 0 .643 .53 1.23 .216 .551 .306 2.61 .349 -.032 1 26 STE65A 1411 1920 510 20 0 .738 .39 1.04 .178 .363 .441 2.75 .450 .016 1 27 STE65C 1408 1916 509 20 0 .695 .46 1.43 .209 .418 .410 2.65 .415 .015 1 28 STE66A 1285 1816 532 21 0 .785 .50 2.63 .441 .816 .435 2.70 .356 -.013 1 29 STE66B 1280 1998 719 28 0 .769 .44 2.00 .218 .533 .393 2.86 .406 -.027 1 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 12069 475 1 .721 .51 2.63 .257 .598 .374 2.92 .373 -.005