NCAS, Montana  - mt121 
Additional Information 
Jeremy Littell           

Purpose of Collection: Climatology - Snowpack reconstruction

Reference: 
Pederson, G.T., S.T. Gray, C.A. Woodhouse, J.L. Betancourt, D.B. Fagre, 
J.S. Littell, E. Watson, B.H. Luckman, and L.J. Graumlich. 2011. 
The unusual nature of recent snowpack declines in the North American Cordillera. 
Sciencexpress, Published online 9 June 2011. 
DOI: 10.1126/science.1201570

COFECHA output: 



      Chronology file name   : MT121.CRN
      Measurement file name  : MT121.RWL
      Date checked           : 07JUN11
      Checked by             : B. Bauer
      Beginning year         : 1336
      Ending year            : 2005
      Principal investigators: Jeremy Littell                             
      Site name              : NCAS
      Site location          : Montana      
      Species information    : LALY SUBALPINE LARCH
      Latitude               :   4816
      Longitude              : -12027
      Elevation              : 2190M

      Series intercorrelation: 0.756
      Avg mean sensitivity   : 0.310
      Avg standard deviation : 0.167
      Avg autocorrelation    : 0.691
      Number dated series    : 24
      Segment length tested  : 50

      Number problem segments: 0
      Pct problem segments   : 0.00



 PART 5:  CORRELATION OF SERIES BY SEGMENTS: NCAS                                                  16:48  Tue 07 Jun 2011  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   1350 1375 1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700 1725 1750 1775 1800 1825

                         1399 1424 1449 1474 1499 1524 1549 1574 1599 1624 1649 1674 1699 1724 1749 1774 1799 1824 1849 1874

 --- -------- ---------  ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----

   1 01       1537 2005                                      .69  .76  .72  .73  .78  .81  .82  .76  .78  .86  .83  .76  .78

   3 03B      1369 2005   .86  .85  .85  .83  .80  .79  .68  .58  .68  .82  .81  .84  .78  .76  .82  .82  .81  .83  .87  .89

   4 04B      1567 2005                                           .74  .81  .78  .82  .85  .86  .84  .87  .83  .71  .79  .87

   5 05B      1633 2005                                                          .72  .72  .75  .81  .78  .79  .71  .70  .78

   6 06A      1491 2005                            .79  .83  .84  .77  .63  .71  .80  .58  .63  .82  .82  .84  .82  .86  .90

   7 101B     1740 2005                                                                              .41  .54  .84  .89  .93

   8 110B     1563 2005                                           .76  .69  .68  .78  .71  .70  .70  .49  .54  .73  .78  .80

   9 108A     1808 2005                                                                                             .71  .94

  10 111x     1556 1718                                           .61  .62  .58  .66  .67  .49

  12 107A     1750 2005                                                                                   .43  .69  .75  .69

  13 04A      1580 2005                                                .81  .72  .75  .85  .84  .88  .88  .87  .79  .85  .91

  14 104A     1740 2005                                                                              .80  .79  .82  .90  .91

  15 03A      1336 2005   .86  .85  .84  .83  .77  .78  .76  .79  .83  .80  .78  .81  .90  .87  .81  .88  .87  .88  .94  .96

  16 107B     1748 2005                                                                              .55  .56  .81  .85  .89

  17 102B     1508 2005                                 .76  .77  .69  .67  .76  .79  .74  .72  .70  .61  .67  .73  .85  .89

  18 104B     1788 2005                                                                                        .91  .91  .90

  19 108B     1791 2005                                                                                        .87  .87  .91

  20 110A     1557 2005                                           .65  .66  .71  .72  .69  .72  .70  .58  .65  .78  .82  .87

  21 101A     1800 2005                                                                                             .87  .88

  22 05A      1746 2005                                                                              .79  .79  .67  .62  .77

  23 103B     1750 2005                                                                                   .67  .77  .80  .89

  24 103B     1440 1571                  .62  .60  .85  .81  .67

 Av segment correlation   .86  .85  .85  .76  .72  .80  .77  .72  .72  .72  .73  .77  .75  .74  .78  .72  .72  .79  .82  .87

 PART 5:  CORRELATION OF SERIES BY SEGMENTS: NCAS                                                  16:48  Tue 07 Jun 2011  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   1850 1875 1900 1925 1950 1975

                         1899 1924 1949 1974 1999 2024

 --- -------- ---------  ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----

   1 01       1537 2005   .84  .84  .66  .67  .74  .77

   2 02       1861 2005   .79  .79  .51  .62  .83  .83

   3 03B      1369 2005   .87  .84  .72  .60  .62  .63

   4 04B      1567 2005   .88  .86  .81  .62  .54  .57

   5 05B      1633 2005   .89  .82  .77  .76  .73  .76

   6 06A      1491 2005   .93  .86  .74  .74  .80  .81

   7 101B     1740 2005   .88  .77  .71  .77  .76  .80

   8 110B     1563 2005   .82  .79  .80  .65  .62  .67

   9 108A     1808 2005   .91  .87  .71  .67  .74  .75

  11 09C      1884 2005        .71  .68  .67  .53  .57

  12 107A     1750 2005   .63  .67  .65  .71  .75  .77

  13 04A      1580 2005   .94  .88  .79  .78  .81  .82

  14 104A     1740 2005   .90  .91  .86  .77  .75  .79

  15 03A      1336 2005   .93  .73  .52  .76  .70  .72

  16 107B     1748 2005   .82  .81  .83  .85  .81  .79

  17 102B     1508 2005   .89  .86  .72  .73  .82  .77

  18 104B     1788 2005   .89  .81  .79  .75  .80  .79

  19 108B     1791 2005   .90  .90  .88  .84  .70  .71

  20 110A     1557 2005   .86  .84  .77  .83  .84  .78

  21 101A     1800 2005   .76  .71  .72  .64  .67  .72

  22 05A      1746 2005   .82  .79  .73  .69  .73  .76

  23 103B     1750 2005   .90  .87  .82  .62  .60  .62

 Av segment correlation   .86  .82  .74  .71  .72  .74

 PART 7:  DESCRIPTIVE STATISTICS: NCAS                                                             16:48  Tue 07 Jun 2011  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 01       1537 2005    469     19      0    .764    .31    .79   .138   .825   .212   2.60   .320   .003   1

   2 02       1861 2005    145      6      0    .727    .26    .48   .085   .576   .242   2.73   .399   .032   1

   3 03B      1369 2005    637     26      0    .773    .21    .66   .105   .771   .303   2.60   .406  -.014   1

   4 04B      1567 2005    439     18      0    .731    .31    .75   .133   .676   .294   2.66   .283  -.009   1

   5 05B      1633 2005    373     15      0    .760    .47    .88   .141   .515   .249   2.58   .335   .009   1

   6 06A      1491 2005    515     21      0    .782    .38    .89   .153   .593   .330   2.57   .337   .000   2

   7 101B     1740 2005    266     11      0    .756    .25   1.03   .177   .805   .383   2.57   .381  -.044   1

   8 110B     1563 2005    443     18      0    .703    .46   1.43   .228   .866   .200   2.64   .308   .018   1

   9 108A     1808 2005    198      8      0    .757    .47    .88   .168   .462   .314   2.45   .395  -.025   1

  10 111x     1556 1718    163      6      0    .561    .56   1.95   .395   .810   .351   2.83   .383   .018   2

  11 09C      1884 2005    122      5      0    .653    .28    .56   .091   .564   .240   2.59   .301   .024   1

  12 107A     1750 2005    256     10      0    .676    .22    .46   .101   .406   .472   2.46   .345  -.028   1

  13 04A      1580 2005    426     17      0    .831    .25    .51   .083   .476   .304   2.51   .365  -.011   2

  14 104A     1740 2005    266     11      0    .832    .54   1.62   .235   .599   .334   2.51   .259   .002   3

  15 03A      1336 2005    670     26      0    .785    .25   1.48   .177   .857   .331   2.48   .283  -.015   1

  16 107B     1748 2005    258     11      0    .765    .26    .70   .148   .694   .428   2.47   .357  -.002   1

  17 102B     1508 2005    498     20      0    .755    .29   1.09   .156   .651   .395   2.60   .340  -.010   1

  18 104B     1788 2005    218      9      0    .856    .28    .92   .151   .689   .394   2.43   .367  -.036   1

  19 108B     1791 2005    215      9      0    .833    .37    .71   .120   .578   .251   2.44   .371  -.005   1

  20 110A     1557 2005    449     18      0    .733    .46   1.82   .250   .839   .235   2.61   .366   .029   1

  21 101A     1800 2005    206      8      0    .739    .51   1.62   .310   .852   .276   2.56   .375  -.035   1

  22 05A      1746 2005    260     11      0    .736    .58   1.31   .222   .536   .310   2.47   .334  -.014   2

  23 103B     1750 2005    256     10      0    .736    .37   1.29   .246   .841   .343   2.54   .361  -.005   1

  24 103B     1440 1571    132      5      0    .680    .24    .45   .095   .542   .374   2.37   .330   .015   2

 --- -------- ---------  -----  -----  -----   ------ -----  -----  -----  -----  -----  -----  -----  -----  --

 Total or mean:           7880    318      0    .756    .35   1.95   .167   .691   .310   2.83   .342  -.005

