Heal Lake, British Columbia - CANA163-CANA167 Floating Chronologies Additional Site Information Qibin Zhang and Richard Hebda Detrending method: Negative exponential or linear regression with negative or 0 slope Collection purpose: Climatology – precipitation analysis Sample location: Disc samples are stored in the warehouse of the Royal British Columbia Meseum (RBCM), and are available by contacting Dr. Richard Hebda at RBCM, 675 Belleville Street, Victoria, BC, V8W 9W2, Canada. Publication citation: Zhang, Q. 2000. Modern and late Holocene climate-tree-ring growth relationships and growth patterns in Douglas-fir, coastal British Columbia, Canada. Ph.D. dissertation, University of Victoria, Victoria, BC, Canada. 196 pp. Disc samples were collected from 706 subfossil logs discovered from the bottom of Heal Lake on southern Vancouver Island. The regional climate is characterized by warm, dry summers and mild, wet winters. The ring-widths of all the samples were measured using a Measu-Chron system, and the tree-ring data were used for dendroclimatic studies. Five floating ring-width chronologies in the past 3rd and 4th millennia were developed using 79 samples. There is a possibility that there are overlaps between chronologies I and II, II and III, and IV and V. The dates of the chronologies should be converted to BC years by subtraction from 8000. For example, if the date of one ring in the chronology is 7200, the actual date should be 8000-7200=800 BC yr. This BC yr is estimated by radiocarbon dates of selected samples within the chronology, and can be shifted backward or forward depending on the errors of the radiocarbon dates. The COFECHA output showed that the average correlation coefficient between one series and the mean of the remaining series within a chronology is around 0.6. COFECHA output: Chronology file name : CANA163.CRN Measurement file name : CANA163.RWL Date checked : 14MAR05 Checked by : H. ADAMS AND J. LUKAS Beginning year : 7578 Ending year : 7931 Principal investigators: Dr. Qibin Zhang and Dr. Richard Hebda Site name : Heal Lake floating chronology I Site location : Canada Species information : PSME DOUGLAS-FIR Latitude : +4832 Longitude : -12328 Elevation : 120M Series intercorrelation: 0.573 Avg mean sensitivity : 0.194 Avg standard deviation : 0.934 Avg autocorrelation : 0.905 Number dated series : 18 Segment length tested : 50 Number problem segments: 8 Pct problem segments : 6.67 PART 5: CORRELATION OF SERIES BY SEGMENTS: cana163.rwl 12:13 Mon 14 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 7625 7650 7675 7700 7725 7750 7775 7800 7825 7850 7875 7674 7699 7724 7749 7774 7799 7824 7849 7874 7899 7924 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 HLL098 7629 7931 .33 .46 .73 .79 .71 .62 .40 .36 .57 .47 .32A 2 HLL580 7764 7918 .55 .61 .79 .83 .60 .53 3 HLL547 7770 7913 .45 .53 .82 .86 .74 .55 4 HLL061 7660 7909 .68 .75 .77 .73 .60 .69 .73 .73 .49 .35B 5 HLL134 7641 7907 .47 .53 .67 .73 .75 .67 .70 .66 .67 .49 .30A 6 HLL440 7750 7906 .57 .73 .83 .78 .60 .37 7 HLL022 7760 7893 .37 .55 .56 .63 .72 8 HLL513 7754 7891 .65 .70 .74 .79 .78 9 HLL934 7754 7891 .67 .77 .76 .78 .76 10 HLL016 7751 7890 .58 .70 .60 .60 .68 11 HLL021 7759 7890 .53 .66 .58 .61 .71 12 HLL258 7643 7886 .31A .36 .67 .74 .77 .69 .59 .61 .54 .27A 13 HLL322 7750 7871 .50 .53 .57 .64 14 HLL673 7700 7857 .22B .38 .58 .49 .36 .39 15 HLL125 7679 7849 .51 .62 .62 .73 .56 .36 16 HLL449 7644 7822 .57 .72 .76 .72 .66 .45 .23B 17 HLL165 7653 7813 .62 .73 .66 .68 .78 .67 18 HLL421 7578 7790 .29A .50 .59 .65 .61 .57 Av segment correlation .39 .55 .68 .66 .66 .59 .59 .62 .67 .61 .40 PART 7: DESCRIPTIVE STATISTICS: cana163.rwl 12:13 Mon 14 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 HLL098 7629 7931 303 11 1 .491 1.26 3.78 .655 .874 .203 2.45 .291 -.009 1 2 HLL580 7764 7918 155 6 0 .639 1.26 3.50 .792 .910 .202 2.57 .389 -.058 1 3 HLL547 7770 7913 144 6 0 .604 1.24 3.27 .601 .832 .226 2.47 .318 -.029 1 4 HLL061 7660 7909 250 10 1 .654 1.39 4.99 1.126 .966 .171 2.56 .363 -.010 1 5 HLL134 7641 7907 267 11 1 .597 1.36 5.74 1.225 .970 .193 2.54 .384 -.007 1 6 HLL440 7750 7906 157 6 0 .628 1.59 4.15 1.010 .931 .180 2.63 .352 -.032 1 7 HLL022 7760 7893 134 5 0 .540 1.35 3.34 .574 .771 .210 2.67 .434 -.023 1 8 HLL513 7754 7891 138 5 0 .722 1.63 4.38 1.018 .918 .187 2.65 .337 -.077 1 9 HLL934 7754 7891 138 5 0 .721 1.68 5.09 1.106 .908 .184 2.74 .391 -.077 1 10 HLL016 7751 7890 140 5 0 .615 1.52 5.21 1.212 .960 .172 2.56 .368 .043 1 11 HLL021 7759 7890 132 5 0 .595 1.19 4.17 .900 .943 .185 2.47 .383 .006 1 12 HLL258 7643 7886 244 10 2 .512 1.58 4.67 1.025 .944 .160 2.63 .353 -.048 1 13 HLL322 7750 7871 122 4 0 .547 1.68 3.50 .586 .833 .163 2.77 .389 .001 1 14 HLL673 7700 7857 158 6 1 .379 1.23 2.65 .578 .817 .258 2.54 .382 .035 1 15 HLL125 7679 7849 171 6 0 .507 1.46 4.39 .919 .933 .170 2.82 .478 -.082 1 16 HLL449 7644 7822 179 7 1 .534 1.84 5.76 1.175 .895 .205 2.53 .344 -.040 1 17 HLL165 7653 7813 161 6 0 .652 1.56 4.62 .916 .863 .228 2.67 .445 -.003 1 18 HLL421 7578 7790 213 6 1 .461 1.42 5.82 1.089 .921 .202 2.54 .350 -.006 1 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 3206 120 8 .573 1.45 5.82 .934 .905 .194 2.82 .370 -.022