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The regression coefficient (Eq. 3.1) for the following variables: T (mean of the monthly maximum temperatures), P (monthly total precipitation), S (monthly hours of sunshine duration), H (mean of the monthly relative humidity). bi – multiple regression parameters. The test of significance gives a p-value (n=38).
Variables
Units
δ13Ccor
δ18O
bi
pi
bi
pi
ba
‰
−15.85
0.004
−34.53
0.267
TApr
‰ / °C
−0.028
0.133
−0.103
0.391
TMay
‰ / °C
−0.043
0.156
0.421
0.043
TJun
‰ / °C
0.037
0.106
0.026
0.857
TJul
‰ / °C
−0.007
0.817
0.306
0.129
TAug
‰ / °C
0.047
0.110
0.219
0.247
TSep
‰ / °C
−0.019
0.352
−0.001
0.993
PApr
‰ / mm
0.001
0.556
0.004
0.755
PMay
‰ / mm
−0.003
0.079
0.004
0.693
P Jun
‰ / mm
−0.001
0.596
−0.007
0.588
PJul
‰ / mm
−0.001
0.592
−0.009
0.270
PAug
‰ / mm
0.002
0.148
−0.002
0.797
PSep
‰ / mm
−0.001
0.652
0.002
0.872
SApr
‰ / hours of sunshine
−0.003
0.179
0.020
0.124
SMay
‰ / hours of sunshine
0.001
0.521
−0.021
0.110
SJun
‰ / hours of sunshine
0.007
0.003
−0.008
0.541
SJul
‰ / hours of sunshine
−0.006
0.045
0.029
0.107
SAug
‰ / hours of sunshine
0.003
0.125
−0.007
0.497
SSep
‰ / hours of sunshine
−0.006
0.013
0.019
0.205
HApr
‰ / %
−0.044
0.104
0.290
0.106
HMay
‰ / %
0.040
0.090
−0.237
0.128
HJun
‰ / %
0.088
0.009
−0.150
0.446
HJul
‰ / %
−0.064
0.104
0.474
0.071
HAug
‰ / %
−0.009
0.672
−0.038
0.782
HSep
‰ / %
−0.090
0.001
0.120
0.374
Statistical characteristics of the site chronologies for the 1951–2012 period. TRW – mean tree-ring width; TRI – mean tree-ring index; MS – mean sensitivity; rbt – the mean correlation of standardized series of trees – the signal strength of the chronology, EPS – the expressed population signal is a statistic for examining the common variability in a chronology.