Boles Creek, California - CA629
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 BOL01A  1849  1998   CS(105 yr)  AR(2)  0.19                  
 2 BOL01B  1768  1998   SL          AR(2)  0.26                  
 3 BOL02A  1208  1951   CS(521 yr)  AR(3)  0.35                  
 4 BOL02B  1748  1951 * SL          AR(3)  0.54                  
 5 BOL03A  1408  1711 * SL          AR(1)  0.39                  
 6 BOL04A  1353  1866 * HL          AR(3)  0.41                  
 7 BOL05A  1344  1636   SL          AR(2)  0.39                  
 8 BOL05B  1482  1998   CS(362 yr)  AR(2)  0.45                  
 9 BOL05C  1454  1998   CS(670 yr)  AR(3)  0.39                  
10 BOL06A  1152  1880 * CS(840 yr)  AR(3)  0.39                  
11 BOL06B  1250  1838 * CS(524 yr)  AR(3)  0.26                  
12 BOL07A  1365  1468 * CS(164 yr)  AR(3)  0.19                  
13 BOL07B1 1701  1829   SL          AR(3)  0.24                  
14 BOL07B2 1846  1998   HL          AR(2)  0.29                  
15 BOL07C1 1758  1885 * CS(106 yr)  AR(2)  0.10                  
16 BOL07C2 1937  1998   HL          AR(1)  0.17                  
17 BOL08A  1394  1958   HL          AR(3)  0.46                  
18 BOL08B  1473  1954   CS(241 yr)  AR(3)  0.33                  
19 BOL09A  1614  1998   CS(270 yr)  AR(3)  0.24                  
20 BOL09B  1677  1998   CS(225 yr)  AR(2)  0.27                  
21 BOL09C  1681  1862   SL          AR(3)  0.31                  
22 BOL10A  1781  1984 * SL          AR(2)  0.48                  
23 BOL10B  1832  1998   CS(117 yr)  AR(2)  0.38                  
24 BOL11A  1776  1998   SL          AR(3)  0.35                  
25 BOL11B1 1874  1998   CS(213 yr)  AR(3)  0.16                  
26 BOL11B2 1634  1843 * CS(155 yr)  AR(2)  0.20                  
27 BOL11C  1464  1998   SL          AR(3)  0.38                  
28 BOL12A  1323  1844   CS(209 yr)  AR(3)  0.41                  
29 BOL12B  1316  1764 * CS(389 yr)  AR(3)  0.26                  
30 BOL13A  1502  1998 * CS(365 yr)  AR(2)  0.31                  
31 BOL14A  1455  1634 * CS(155 yr)  AR(1)  0.26                  
32 BOL15A  1844  1998   SL          AR(3)  0.26                  
33 BOL15B  1858  1998   CS(99 yr)   AR(2)  0.20                  
34 BOL16A  1864  1998   SL          AR(2)  0.34                  
35 BOL16B  1851  1998   SL          AR(2)  0.36                  
36 BOL17A  1542  1998   CS(516 yr)  AR(3)  0.29                  
37 BOL18A  1887  1998   CS(78 yr)   AR(1)  0.02                  
38 BOL18B  1434  1908 * CS(622 yr)  AR(2)  0.28                  
39 BOL18C  1220  1906 * CS(260 yr)  AR(2)  0.19                  
40 BOL19A  1648  1998   SL          AR(2)  0.17                  
                                                                 
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   : CA629.CRN
      Measurement file name  : CA629.RWL
      Date checked           : 11MAR05
      Checked by             : H. ADAMS AND J. LUKAS
      Beginning year         : 1152
      Ending year            : 1998
      Principal investigators: MEKO,BAISAN,FUNKHOUSER,MILLER,TOUCHAN                 
      Site name              : BOLES CREEK
      Site location          : CALIFORNIA   
      Species information    : JUOC WESTERN JUNIPER
      Latitude               :  +4127
      Longitude              : -12054
      Elevation              : 1302M

      Series intercorrelation: 0.679
      Avg mean sensitivity   : 0.312
      Avg standard deviation : 0.293
      Avg autocorrelation    : 0.678
      Number dated series    : 43
      Segment length tested  : 50

      Number problem segments: 1
      Pct problem segments   : 0.18


PART 5:  CORRELATION OF SERIES BY SEGMENTS: ca629.rwl                                              17:09  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   1200 1225 1250 1275 1300 1325 1350 1375 1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675
                         1249 1274 1299 1324 1349 1374 1399 1424 1449 1474 1499 1524 1549 1574 1599 1624 1649 1674 1699 1724
 --- -------- ---------  ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
   3 BOL02A   1208 1951   .55  .64  .71  .63  .65  .64  .58  .63  .80  .76  .57  .45  .45  .72  .80  .72  .72  .70  .63  .54
   5 BOL03A   1408 1791                                           .50  .57  .45  .49  .55  .59  .64  .67  .65  .66  .77  .76
   8 BOL04A   1353 1871                                 .72  .75  .59  .58  .50  .43  .64  .77  .80  .83  .77  .65  .74  .74
   9 BOL04B   1216 1620   .76  .76  .74  .66  .68  .77  .68  .50  .56  .54  .56  .70  .59  .62  .65  .61
  10 BOL05A   1344 1636                            .64  .62  .55  .77  .86  .80  .78  .79  .84  .82  .77  .75
  11 BOL05B   1482 1998                                                          .82  .77  .73  .73  .73  .71  .69  .71  .56
  12 BOL05C   1454 1998                                                     .81  .77  .79  .80  .87  .82  .80  .78  .75  .65
  13 BOL06A   1152 1894   .73  .82  .87  .85  .82  .70  .69  .71  .75  .82  .81  .70  .72  .73  .65  .71  .70  .68  .72  .65
  14 BOL06B   1250 1998             .86  .89  .87  .82  .62  .52  .66  .68  .71  .65  .57  .66  .71  .70  .65  .71  .73  .62
  15 BOL07A   1235 1468        .78  .84  .70  .58  .77  .70  .43  .68  .80
  20 BOL08A   1394 1958                                      .51  .57  .55  .37  .49  .59  .64  .66  .67  .71  .65  .60  .62
  21 BOL08B   1473 1954                                                     .59  .55  .67  .69  .60  .60  .67  .70  .66  .64
  22 BOL09A   1614 1998                                                                                   .83  .82  .81  .80
  23 BOL09B   1677 1998                                                                                                  .77
  24 BOL09C   1681 1862                                                                                                  .75
  29 BOL11B2  1634 1855                                                                                        .78  .78  .72
  30 BOL11C   1464 1998                                                     .68  .70  .69  .64  .72  .80  .64  .76  .82  .76
  31 BOL12A   1323 1844                       .75  .76  .75  .63  .66  .74  .74  .47  .42  .71  .77  .77  .75  .68  .46  .40
  32 BOL12B   1275 1829                  .53  .38  .68  .63  .62  .63  .65  .74  .69  .73  .77  .77  .78  .77  .75  .79  .81
  33 BOL13A   1477 1998                                                          .63  .76  .83  .74  .67  .72  .59  .59  .74
  34 BOL14A   1414 1634                                           .56  .59  .38  .45  .44  .45  .49  .64  .68
  39 BOL17A   1542 1998                                                                    .82  .85  .83  .73  .66  .72  .75
  41 BOL18B   1434 1998                                                .81  .72  .61  .75  .86  .90  .89  .82  .82  .88  .84
  42 BOL18C   1211 1997   .69  .76  .81  .79  .81  .85  .81  .73  .76  .83  .81  .72  .74  .83  .81  .74  .82  .83  .79  .79
  43 BOL19A   1648 1998                                                                                        .69  .69  .69
 Av segment correlation   .68  .75  .80  .72  .69  .74  .68  .60  .66  .70  .64  .62  .65  .72  .73  .73  .73  .72  .72  .69
PART 5:  CORRELATION OF SERIES BY SEGMENTS: ca629.rwl                                              17:09  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   1700 1725 1750 1775 1800 1825 1850 1875 1900 1925 1950
                         1749 1774 1799 1824 1849 1874 1899 1924 1949 1974 1999
 --- -------- ---------  ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
   1 BOL01A   1849 1998                            .56  .57  .73  .51  .41  .59
   2 BOL01B   1768 1998             .82  .84  .70  .66  .61  .52  .51  .63  .54
   3 BOL02A   1208 1951   .55  .60  .69  .62  .49  .70  .71  .60  .37  .35
   4 BOL02B   1748 1998        .72  .71  .73  .64  .69  .74  .79  .66  .58  .67
   5 BOL03A   1408 1791   .75  .70  .65
   6 BOL03B   1902 1998                                           .52  .36  .57
   7 BOL03C   1934 1998                                                .35  .67
   8 BOL04A   1353 1871   .63  .57  .48  .55  .72  .66
  11 BOL05B   1482 1998   .68  .83  .69  .65  .63  .67  .54  .47  .56  .58  .79
  12 BOL05C   1454 1998   .73  .84  .85  .79  .54  .57  .59  .59  .68  .74  .69
  13 BOL06A   1152 1894   .66  .66  .73  .80  .53  .42  .43
  14 BOL06B   1250 1998   .63  .65  .59  .69  .63  .52  .63  .59  .52  .41  .50
  16 BOL07B1  1701 1829   .35  .51  .66  .70  .73
  17 BOL07B2  1846 1998                            .62  .64  .67  .67  .58  .80
  18 BOL07C1  1758 1909             .65  .61  .65  .68  .67  .61
  19 BOL07C2  1937 1998                                                .59  .64
  20 BOL08A   1394 1958   .59  .38  .63  .74  .61  .57  .47  .50  .54  .56
  21 BOL08B   1473 1954   .66  .63  .71  .70  .62  .54  .57  .77  .62  .48
  22 BOL09A   1614 1998   .79  .80  .90  .90  .81  .68  .72  .85  .68  .55  .55
  23 BOL09B   1677 1998   .76  .76  .85  .88  .88  .83  .66  .73  .66  .55  .72
  24 BOL09C   1681 1862   .77  .77  .83  .81  .39  .25B
  25 BOL10A   1781 1998                  .77  .69  .67  .78  .81  .76  .72  .85
  26 BOL10B   1832 1998                            .74  .79  .82  .85  .74  .72
  27 BOL11A   1776 1998                  .79  .76  .70  .81  .78  .72  .65  .73
  28 BOL11B1  1874 1998                                 .73  .77  .76  .58  .59
  29 BOL11B2  1634 1855   .76  .75  .87  .89  .57  .39
  30 BOL11C   1464 1998   .82  .82  .88  .90  .82  .78  .82  .79  .77  .73  .82
  31 BOL12A   1323 1844   .36  .37  .66  .67  .48
  32 BOL12B   1275 1829   .76  .61  .48  .54  .45
  33 BOL13A   1477 1998   .70  .75  .83  .78  .62  .66  .68  .74  .73  .48  .56
  35 BOL15A   1844 1998                            .67  .62  .65  .48  .43  .72
  36 BOL15B   1858 1998                                 .70  .71  .71  .63  .75
  37 BOL16A   1864 1998                                 .76  .85  .81  .73  .74
  38 BOL16B   1851 1998                                 .70  .83  .75  .70  .73
  39 BOL17A   1542 1998   .75  .77  .74  .74  .68  .66  .67  .70  .54  .47  .75
  40 BOL18A   1887 1998                                      .58  .70  .64  .65
  41 BOL18B   1434 1998   .86  .87  .83  .82  .71  .74  .75  .70  .51  .39  .79
  42 BOL18C   1211 1997   .75  .72  .78  .76  .54  .58  .69  .68  .48  .43  .45
  43 BOL19A   1648 1998   .61  .67  .51  .53  .67  .65  .77  .81  .74  .65  .71
 Av segment correlation   .68  .69  .72  .74  .64  .62  .67  .70  .63  .56  .68
PART 7:  DESCRIPTIVE STATISTICS: ca629.rwl                                                         17:09  Fri 11 Mar 2005  Page  10
------------------------------------------------------------------------------------------------------------------------------------

                                                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 BOL01A   1849 1998    150      6      0    .591    .87   1.94   .412   .757   .312   2.43   .365   .003   3
   2 BOL01B   1768 1998    231      9      0    .654    .74   1.85   .341   .744   .316   2.40   .321  -.031   1
   3 BOL02A   1208 1951    744     30      0    .639    .57   3.94   .464   .857   .337   2.63   .335  -.019   1
   4 BOL02B   1748 1998    251     10      0    .679    .65   1.39   .264   .735   .265   2.46   .326   .024   1
   5 BOL03A   1408 1791    384     15      0    .612    .48   1.57   .266   .665   .383   2.73   .409  -.013   3
   6 BOL03B   1902 1998     97      3      0    .540    .56   1.57   .299   .649   .376   2.63   .427  -.042   1
   7 BOL03C   1934 1998     65      2      0    .565    .72   2.09   .390   .613   .331   2.76   .402   .030   1
   8 BOL04A   1353 1871    519     20      0    .647    .83   2.00   .302   .578   .270   2.72   .375   .002   1
   9 BOL04B   1216 1620    405     16      0    .634    .39   1.22   .220   .594   .409   2.73   .453  -.038   1
  10 BOL05A   1344 1636    293     12      0    .748    .78   2.30   .483   .826   .282   2.62   .420  -.019   1
  11 BOL05B   1482 1998    517     20      0    .672    .46   1.27   .241   .750   .297   2.67   .349  -.023   1
  12 BOL05C   1454 1998    545     21      0    .740    .44   1.42   .247   .741   .331   2.74   .402  -.008   1
  13 BOL06A   1152 1894    743     27      0    .699    .51   1.49   .232   .692   .273   2.51   .303  -.009   1
  14 BOL06B   1250 1998    749     29      0    .652    .42   1.35   .213   .743   .309   2.63   .358   .005   1
  15 BOL07A   1235 1468    234      9      0    .699    .94   2.55   .450   .712   .265   2.58   .384  -.049   1
  16 BOL07B1  1701 1829    129      5      0    .573    .30    .67   .126   .489   .380   2.64   .456  -.035   1
  17 BOL07B2  1846 1998    153      6      0    .701    .58   1.36   .206   .517   .275   2.54   .402  -.030   1
  18 BOL07C1  1758 1909    152      6      0    .638    .32    .82   .158   .525   .401   2.66   .434   .007   1
  19 BOL07C2  1937 1998     62      2      0    .643    .27    .59   .110   .408   .330   2.89   .620   .033   1
  20 BOL08A   1394 1958    565     23      0    .564    .56   1.52   .274   .661   .358   2.59   .305  -.041   1
  21 BOL08B   1473 1954    482     20      0    .617    .66   2.71   .432   .746   .387   2.58   .368  -.031   1
  22 BOL09A   1614 1998    385     15      0    .764    .76   1.55   .292   .637   .273   2.53   .343   .003   1
  23 BOL09B   1677 1998    322     12      0    .746    .71   1.87   .379   .768   .344   2.51   .331  -.042   1
  24 BOL09C   1681 1862    182      7      1    .673    .45   1.21   .262   .769   .345   2.57   .395  -.034   1
  25 BOL10A   1781 1998    218      8      0    .752   1.03   2.57   .415   .684   .275   2.71   .454  -.002   1
  26 BOL10B   1832 1998    167      6      0    .758    .94   2.17   .472   .816   .301   2.46   .380  -.009   1
  27 BOL11A   1776 1998    223      8      0    .749    .42    .96   .175   .649   .314   2.65   .441   .015   1
  28 BOL11B1  1874 1998    125      5      0    .679    .55   1.26   .183   .402   .294   2.62   .459  -.018   2
  29 BOL11B2  1634 1855    222      9      0    .730    .63   1.13   .219   .581   .258   2.65   .295  -.021   2
  30 BOL11C   1464 1998    535     21      0    .775    .40    .92   .151   .594   .297   2.49   .282  -.005   1
  31 BOL12A   1323 1844    522     21      0    .604    .59   1.65   .296   .693   .310   2.62   .301  -.010   1
  32 BOL12B   1275 1829    555     22      0    .680    .44   1.13   .202   .631   .326   2.54   .285  -.008   1
  33 BOL13A   1477 1998    522     20      0    .683    .66   3.15   .498   .875   .295   2.58   .317  -.012   1
  34 BOL14A   1414 1634    221      9      0    .523   1.12   2.34   .450   .668   .274   2.40   .297   .016   1
  35 BOL15A   1844 1998    155      6      0    .611   1.11   2.25   .402   .398   .310   2.54   .444  -.045   2
  36 BOL15B   1858 1998    141      5      0    .720   1.49   2.90   .600   .536   .308   2.55   .370  -.047   1
  37 BOL16A   1864 1998    135      5      0    .780   1.02   2.36   .386   .675   .252   2.63   .427  -.004   3
  38 BOL16B   1851 1998    148      5      0    .723   1.02   2.02   .332   .540   .263   2.74   .513  -.020   3
  39 BOL17A   1542 1998    457     18      0    .715    .48   1.60   .208   .605   .308   2.78   .383   .014   1
  40 BOL18A   1887 1998    112      4      0    .609    .44    .85   .132   .358   .289   2.48   .402  -.008   1
  41 BOL18B   1434 1998    565     22      0    .781    .48   1.04   .183   .611   .275   2.66   .415  -.016   1
  42 BOL18C   1211 1997    787     31      0    .724    .48   1.41   .264   .786   .300   2.67   .369  -.016   1
  43 BOL19A   1648 1998    351     14      0    .664    .69   1.54   .240   .346   .330   2.71   .451   .012   1
 --- -------- ---------  -----  -----  -----   ------ -----  -----  -----  -----  -----  -----  -----  -----  --
 Total or mean:          14520    564      1    .679    .60   3.94   .293   .678   .312   2.89   .364  -.013