Six Temperature Proxies of Scots Pine from the Interior of Northern Fennoscandia Combined in Three Frequency Ranges

Table 2

Six proxies versus mean June–August temperatures in 1908–2002 (no filtering). RE, CE, and 𝑟² during EC-LV (1908–1955 and 1955–2002) and LC-EV (1955–2002 and 1908–1955). Only test results with RE and CE > 0 are included.

	EC-LV			LC-EV
	RE	CE	𝑟^2	RE	CE	𝑟^2
(A) RCS indexing
SXD	0.53	0.53	0.56	0.53	0.53	0.56
FXD	0.43	0.42	0.44	0.42	0.42	0.44
RRW	0.1	0.1	0.11	0.15	0.15	0.17
(B) 180-year spline indexing
SRW	0.17	0.17	0.21	0.07	0.07	0.28
SXD	0.47	0.47	0.54	0.45	0.45	0.57
FXD	0.35	0.35	0.44	0.27	0.26	0.43
RRW	0.12	0.12	0.13	0.15	0.15	0.18
(C) 30-year spline indexing
SRW	0.18	0.17	0.21	0.14	0.13	0.20
SXD	0.49	0.49	0.50	0.41	0.41	0.42
FRW	0.14	0.14	0.16	0.11	0.10	0.15
FHI	0.46	0.46	0.48	0.28	0.28	0.31
FXD	0.39	0.39	0.40	0.37	0.37	0.38
RRW	0.16	0.16	0.17	0.14	0.14	0.15