Jackson Meadow Reservoir, California CA631 Additional Site Information Dave Meko Ringwidths were detrended by the ratio method, as described by Cook et al. (1990), with the objective of producing a site chronology for studying climate variations. Care was accordingly taken to retain the low-frequency variability characteristic of the entire site, and to de-emphasise tree-specific variability. The first step in the detrending method used was automated curve fitting with monotonic non-increasing curves (spline, straight line with negative slope, or horizontal line) to remove any gradual decrease in ringwidth over full length of series. The second step was optional manual over-riding of the automated curve-fit as needed to emphasize site-wide fluctuations. This manual step optionally included truncating an individual ring-width series, deleting it from the chronology, or modifying its curve fit by selecting a more suitable detrending line (e.g., a stiffer spline (Cook and Peters 1981), or a horizontal line instead of a straight line with a negative slope) The final selected detrending curves are listed in table below. Note that the table lists only those ring width series actually used in the chronology; additional ring-width series, masked out from the chronology building, might be included in the .rwl data file sent to the ITRDB. After the trend line was fit, core indices were computed by dividing the ring-width in each year by the value of the fitted trend line. Core indices were then averaged to get tree indices, and tree indices were averaged to get a site index, or standard chronology. Averaging of tree indices for a given year was by the arithmetic mean if fewer than 6 trees; otherwise by a bi-weight mean. The residual chronology was computed in same way as the standard chronology except that autoregressive residuals of core indices were 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 JMR01A 1791 1998 SL AR(1) 0.37 2 JMR01B 1597 1998 CS(281 yr) AR(2) 0.15 3 JMR02B 1667 1855 * CS(664 yr) AR(3) 0.28 4 JMR03A 1899 1998 CS(50 yr) AR(1) 0.12 5 JMR03B 1839 1999 CS(113 yr) AR(3) 0.20 6 JMR04A 1597 1999 CS(282 yr) AR(3) 0.35 7 JMR05A 1395 1998 CS(761 yr) AR(3) 0.19 8 JMR05B 1740 1998 HL AR(3) 0.14 9 JMR05C 1409 1998 CS(413 yr) AR(3) 0.24 10 JMR06A 1620 1886 CS(334 yr) AR(3) 0.39 11 JMR08A 1605 1999 SL AR(3) 0.49 12 JMR08B 1552 1904 SL AR(2) 0.50 13 JMR09A 1703 1999 CS(425 yr) AR(3) 0.12 14 JMR09B 1733 1999 * CS(310 yr) AR(2) 0.25 15 JMR10A 1705 1999 CS(289 yr) AR(3) 0.34 16 JMR10B 1814 1999 SL AR(3) 0.32 17 JMR12A 1763 1961 * CS(784 yr) AR(2) 0.23 18 JMR12B 1349 1999 CS(128 yr) AR(3) 0.36 19 JMR13B 1142 1814 CS(471 yr) AR(3) 0.41 20 JMR14A 1294 1999 CS(494 yr) AR(3) 0.22 21 JMR14B 1437 1974 CS(377 yr) AR(3) 0.28 22 JMR15A 1625 1903 * CS(325 yr) AR(3) 0.29 23 JMR15B 1565 1947 CS(632 yr) AR(3) 0.37 24 JMR16A 1716 1928 * CS(128 yr) AR(3) 0.31 25 JMR16B 1210 1923 CS(557 yr) AR(3) 0.56 26 JMR17A 1085 1717 CS(576 yr) AR(3) 0.51 27 JMR18A 930 1954 CS(718 yr) AR(3) 0.44 28 JMR19A 1097 1705 CS(426 yr) AR(3) 0.45 29 JMR20A 930 1481 SL AR(3) 0.43 30 JMR20B 1008 1546 CS(566 yr) AR(3) 0.24 31 JMR21A 1076 1548 CS(331 yr) AR(3) 0.41 32 JMR22B 1718 1992 SL AR(2) 0.32 33 JMR23B 1844 1999 HL AR(3) 0.39 34 JMR23C 1812 1984 SL AR(3) 0.34 35 JMR24A 1093 1793 CS(280 yr) AR(3) 0.45 Fit Period = period of ring width used in curve fitting * = subset of full period of ring width in .rwl file 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 : CA631.CRN Measurement file name : CA631.RWL Date checked : 11MAR05 Checked by : H. ADAMS AND J. LUKAS Beginning year : 930 Ending year : 1999 Principal investigators: MEKO, BAISAN,TOUCHAN,GROW,FUNKHOUSER Site name : JACKSON MEADOW RESERVOIR Site location : CALIFORNIA Species information : JUOC WESTERN JUNIPER Latitude : +3931 Longitude : -12033 Elevation : 1921M Series intercorrelation: 0.625 Avg mean sensitivity : 0.280 Avg standard deviation : 0.282 Avg autocorrelation : 0.736 Number dated series : 39 Segment length tested : 50 Number problem segments: 6 Pct problem segments : 0.97 PART 5: CORRELATION OF SERIES BY SEGMENTS: ca631.rwl 17:10 Fri 11 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 925 950 975 1000 1025 1050 1075 1100 1125 1150 1175 1200 1225 1250 1275 1300 1325 1350 1375 1400 974 999 1024 1049 1074 1099 1124 1149 1174 1199 1224 1249 1274 1299 1324 1349 1374 1399 1424 1449 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 7 JMR05A 1395 1998 .83 .85 9 JMR05C 1409 1998 .83 20 JMR12B 1349 1999 .75 .75 .68 .59 21 JMR13B 1142 1814 .67 .67 .67 .46 .48 .64 .58 .50 .61 .57 .56 .71 22 JMR14A 1294 1999 .57 .65 .74 .79 .84 .82 27 JMR16B 1210 1923 .38 .62 .70 .75 .65 .71 .77 .66 .48 28 JMR17A 1085 1717 .35 .46 .55 .64 .72 .53 .58 .73 .60 .52 .62 .67 .63 .64 29 JMR18A 930 1954 .42 .43 .38 .35 .57 .56 .36 .40 .55 .67 .49 .48 .53 .55 .63 .52 .41 .54 .62 .53 30 JMR19A 1097 1705 .41 .44 .55 .61 .63 .50 .48 .59 .59 .64 .78 .58 .52 .57 31 JMR20A 930 1481 .42 .43 .52 .55 .66 .66 .40 .44 .58 .58 .68 .58 .49 .67 .69 .42 .56 .72 .77 .59 32 JMR20B 1008 1546 .66 .66 .73 .56 .53 .62 .73 .80 .51 .49 .57 .52 .48 .59 .71 .77 .78 33 JMR21A 1076 1548 .35 .39 .63 .61 .43 .42 .60 .49 .47 .56 .66 .62 .71 .76 39 JMR24A 1093 1793 .38 .53 .62 .60 .64 .51 .49 .71 .72 .67 .76 .72 .56 .50 Av segment correlation .42 .43 .45 .52 .63 .65 .40 .46 .60 .64 .63 .48 .53 .63 .61 .56 .66 .68 .68 .67 PART 5: CORRELATION OF SERIES BY SEGMENTS: ca631.rwl 17:10 Fri 11 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 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700 1725 1750 1775 1800 1825 1850 1875 1900 1474 1499 1524 1549 1574 1599 1624 1649 1674 1699 1724 1749 1774 1799 1824 1849 1874 1899 1924 1949 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 JMR01A 1791 1998 .48 .50 .52 .40 .29B .44 2 JMR01B 1597 1998 .31A .36 .59 .57 .61 .57 .64 .76 .58 .44 .59 .72 .55 .62 3 JMR02B 1667 1998 .43 .49 .47 .56 .65 .54 .33 .46 .24A .21A .58 4 JMR03A 1899 1998 .70 .71 5 JMR03B 1839 1999 .64 .75 .76 .63 6 JMR04A 1597 1999 .71 .71 .67 .56 .64 .67 .65 .65 .66 .69 .71 .62 .56 .58 7 JMR05A 1395 1998 .83 .85 .91 .79 .70 .78 .70 .73 .83 .75 .73 .70 .77 .79 .74 .78 .83 .84 .82 .81 8 JMR05B 1740 1998 .75 .73 .72 .73 .78 .84 .83 .82 9 JMR05C 1409 1998 .78 .80 .90 .89 .82 .79 .77 .75 .73 .71 .71 .69 .77 .79 .63 .68 .82 .85 .81 .85 10 JMR06A 1620 1886 .69 .69 .71 .72 .64 .47 .62 .64 .69 .70 .63 11 JMR06B 1656 1875 .60 .65 .55 .37 .56 .69 .73 .66 .67 12 JMR06C 1498 1729 .62 .60 .53 .58 .53 .57 .67 .66 .69 .73 13 JMR08A 1605 1999 .61 .52 .51 .43 .44 .63 .73 .66 .59 .50 .51 .44 .58 14 JMR08B 1552 1904 .35 .50 .57 .51 .51 .37 .40 .53 .55 .48 .52 .63 .65 .63 15 JMR09A 1703 1999 .66 .73 .78 .72 .73 .70 .56 .62 .71 16 JMR09B 1648 1999 .44 .46 .51 .62 .69 .64 .60 .52 .42 .38 .34 .42 17 JMR10A 1705 1999 .50 .70 .72 .66 .78 .76 .62 .73 .69 18 JMR10B 1814 1999 .68 .64 .61 .76 .75 19 JMR12A 1763 1999 .49 .54 .66 .57 .46 .50 .37 20 JMR12B 1349 1999 .62 .63 .49 .54 .65 .61 .49 .55 .62 .52 .57 .63 .65 .65 .67 .72 .81 .81 .74 .70 21 JMR13B 1142 1814 .71 .62 .47 .48 .61 .69 .65 .68 .79 .77 .54 .53 .69 .67 .59 22 JMR14A 1294 1999 .80 .86 .88 .83 .79 .76 .60 .64 .82 .73 .70 .74 .80 .74 .71 .79 .83 .84 .82 .77 23 JMR14B 1437 1974 .81 .83 .84 .84 .87 .89 .79 .75 .85 .84 .80 .73 .76 .78 .63 .66 .63 .63 .74 .79 24 JMR15A 1625 1940 .82 .78 .77 .78 .82 .91 .71 .64 .73 .75 .77 .81 25 JMR15B 1565 1947 .74 .71 .81 .88 .81 .69 .62 .68 .85 .85 .81 .78 .68 .67 .80 26 JMR16A 1716 1999 .54 .55 .48 .41 .62 .67 .67 .60 .39 27 JMR16B 1210 1923 .50 .44 .48 .65 .72 .79 .72 .63 .62 .61 .62 .63 .74 .81 .52 .46 .73 .76 .56 28 JMR17A 1085 1717 .59 .49 .42 .50 .61 .73 .68 .66 .64 .54 .51 29 JMR18A 930 1954 .62 .70 .67 .60 .64 .86 .68 .64 .71 .60 .66 .66 .65 .58 .46 .64 .60 .47 .54 .60 30 JMR19A 1097 1705 .53 .59 .47 .46 .63 .64 .58 .57 .56 .62 .66 31 JMR20A 930 1481 .35 .33 32 JMR20B 1008 1546 .72 .72 .73 .67 33 JMR21A 1076 1548 .68 .69 .57 .56 34 JMR22A 1742 1921 .36 .60 .67 .67 .67 .52 .47 35 JMR22B 1718 1992 .46 .58 .65 .66 .67 .63 .51 .49 .63 36 JMR23A 1794 1999 .48 .58 .59 .38 .51 .52 37 JMR23B 1844 1999 .63 .61 .71 .71 38 JMR23C 1812 1984 .74 .76 .70 .67 .65 39 JMR24A 1093 1793 .60 .63 .65 .71 .67 .38 .38 .64 .52 .56 .80 .68 .50 .45 Av segment correlation .65 .66 .65 .65 .69 .68 .61 .64 .67 .63 .63 .61 .64 .68 .62 .65 .67 .62 .61 .65 PART 5: CORRELATION OF SERIES BY SEGMENTS: ca631.rwl 17:10 Fri 11 Mar 2005 Page 7 ------------------------------------------------------------------------------------------------------------------------------------ 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 1925 1950 1974 1999 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 JMR01A 1791 1998 .77 .75 2 JMR01B 1597 1998 .79 .78 3 JMR02B 1667 1998 .40 .48 4 JMR03A 1899 1998 .74 .73 5 JMR03B 1839 1999 .34B .31A 6 JMR04A 1597 1999 .48 .54 7 JMR05A 1395 1998 .78 .81 8 JMR05B 1740 1998 .81 .82 9 JMR05C 1409 1998 .75 .59 13 JMR08A 1605 1999 .57 .55 15 JMR09A 1703 1999 .71 .77 16 JMR09B 1648 1999 .59 .59 17 JMR10A 1705 1999 .74 .76 18 JMR10B 1814 1999 .69 .64 19 JMR12A 1763 1999 .55 .63 20 JMR12B 1349 1999 .74 .70 22 JMR14A 1294 1999 .76 .80 23 JMR14B 1437 1974 .70 26 JMR16A 1716 1999 .49 .58 29 JMR18A 930 1954 .59 35 JMR22B 1718 1992 .75 .74 36 JMR23A 1794 1999 .54 .61 37 JMR23B 1844 1999 .72 .69 38 JMR23C 1812 1984 .60 .52 Av segment correlation .65 .65 PART 7: DESCRIPTIVE STATISTICS: ca631.rwl 17:10 Fri 11 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 JMR01A 1791 1998 208 8 1 .532 .78 1.78 .266 .594 .251 2.74 .428 -.043 1 2 JMR01B 1597 1998 402 16 1 .596 .68 1.71 .344 .727 .327 2.60 .302 -.009 1 3 JMR02B 1667 1998 332 13 2 .438 .47 1.39 .244 .830 .231 2.63 .296 -.009 2 4 JMR03A 1899 1998 100 4 0 .713 1.54 3.10 .597 .619 .243 2.98 .558 -.042 1 5 JMR03B 1839 1999 161 6 2 .522 .87 2.90 .556 .766 .283 2.48 .344 -.016 1 6 JMR04A 1597 1999 403 16 0 .617 .44 1.02 .169 .674 .253 2.52 .321 -.006 1 7 JMR05A 1395 1998 604 24 0 .789 .40 1.10 .188 .482 .416 2.62 .327 .011 1 8 JMR05B 1740 1998 259 10 0 .786 .38 1.02 .156 .313 .410 2.71 .461 .008 1 9 JMR05C 1409 1998 590 23 0 .774 .40 1.12 .231 .718 .418 2.55 .311 -.001 1 10 JMR06A 1620 1886 267 11 0 .640 .51 1.11 .196 .614 .293 2.63 .346 .002 1 11 JMR06B 1656 1875 220 9 0 .609 .93 1.87 .333 .682 .223 2.65 .369 .042 2 12 JMR06C 1498 1729 232 10 0 .627 .67 1.46 .231 .706 .212 2.64 .438 -.017 1 13 JMR08A 1605 1999 395 15 0 .554 .89 2.74 .475 .887 .192 2.79 .421 .006 1 14 JMR08B 1552 1904 353 14 0 .501 .48 1.10 .167 .694 .210 2.91 .413 -.032 5 15 JMR09A 1703 1999 297 11 0 .691 .53 .97 .179 .626 .251 2.55 .303 -.019 1 16 JMR09B 1648 1999 352 14 0 .515 .31 .84 .166 .735 .331 2.62 .366 -.016 3 17 JMR10A 1705 1999 295 11 0 .670 1.12 2.95 .407 .563 .252 2.70 .424 .027 1 18 JMR10B 1814 1999 186 7 0 .677 .64 2.22 .255 .502 .281 2.67 .383 .042 1 19 JMR12A 1763 1999 237 9 0 .522 .58 2.56 .473 .910 .212 2.74 .418 -.003 1 20 JMR12B 1349 1999 651 26 0 .647 .33 .99 .150 .687 .305 2.66 .331 -.006 2 21 JMR13B 1142 1814 673 27 0 .606 .73 2.35 .418 .897 .216 2.71 .289 -.009 1 22 JMR14A 1294 1999 706 28 0 .761 .50 1.75 .293 .748 .386 2.75 .380 .014 1 23 JMR14B 1437 1974 538 21 0 .757 .33 .90 .171 .629 .412 2.61 .349 -.008 1 24 JMR15A 1625 1940 316 12 0 .770 .60 2.69 .410 .820 .306 2.86 .428 -.002 2 25 JMR15B 1565 1947 383 15 0 .751 .59 2.27 .354 .822 .290 2.94 .368 .006 1 26 JMR16A 1716 1999 284 11 0 .537 .58 2.46 .415 .847 .324 2.69 .415 .013 1 27 JMR16B 1210 1923 714 28 0 .628 .54 2.70 .373 .886 .290 2.54 .361 -.010 2 28 JMR17A 1085 1717 633 25 0 .582 .63 2.00 .284 .852 .183 2.69 .330 -.007 1 29 JMR18A 930 1954 1025 41 0 .540 .44 2.27 .289 .853 .276 2.60 .327 -.004 1 30 JMR19A 1097 1705 609 25 0 .566 .80 3.35 .493 .804 .257 2.90 .389 -.027 1 31 JMR20A 930 1481 552 22 0 .547 .40 .92 .155 .661 .255 2.63 .334 .006 1 32 JMR20B 1008 1546 539 21 0 .650 .46 1.55 .202 .749 .241 2.74 .388 .017 1 33 JMR21A 1076 1548 473 18 0 .559 .56 1.29 .151 .622 .173 2.65 .392 -.005 1 34 JMR22A 1742 1921 180 7 0 .544 .41 .86 .153 .693 .257 2.67 .332 -.017 1 35 JMR22B 1718 1992 275 11 0 .613 .57 1.12 .174 .577 .225 2.50 .317 -.038 1 36 JMR23A 1794 1999 206 8 0 .520 .53 1.39 .239 .772 .260 2.84 .457 .007 1 37 JMR23B 1844 1999 156 6 0 .661 .62 1.15 .207 .550 .264 2.54 .336 .010 1 38 JMR23C 1812 1984 173 7 0 .652 .72 1.63 .317 .732 .260 2.77 .491 .007 1 39 JMR24A 1093 1793 701 28 0 .584 .59 2.25 .340 .884 .237 2.64 .351 .002 2 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 15680 618 6 .625 .56 3.35 .282 .736 .280 2.98 .361 -.003