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MOHONK LAKE TALUS SLOPE HEMLOCK
A . C O RREL A T I O N FUNCTIO N
0.4
TMP
0.2
0
-0.2
A PRIORI 2-TAILED 95% C.L.
-0.4
A POSTERIO RI 2-TAILED 95% C.L.
GROWTH YEARS
PRIOR YEAR CURRENT YEAR
B. RESPONSE FUNCTION
0.2
0.1
0
-0.1
-0.2
Fig. 4.3 Correlation function ( top panel ) and response function ( bottom panel ) analyses of an
eastern hemlock tree-ring chronology located near Mohonk Lake, New York
Blasing et al. 1984 ) have been computed for this hemlock chronology by using
monthly climate data from the Mohonk Lake cooperative weather station located
about one kilometer from the tree-ring site at nearly the same elevation. The tree-
ring and climate records cover the periods 1850-1996 and 1896-2004, respectively.
So the joint period covered by the two datasets is 1896-1996. The correlation and
response functions shown here were calculated and tested as follows:
1. The correlation and response functions span a 'dendroclimatic year' (Fritts 1976 )
that begins in May of the previous growing season and ends in August of the
current growing season. This 16-month year is arranged to include two complete
 
 
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