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Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 2 Correlation coefficients between tree-ring δ18O and NPGO index after band-pass filtration

From: Relationship between the Northern Pacific Gyre Oscillation and tree-ring cellulose oxygen isotopes in northeastern Japan

Correlation

+JF

+MA

+MJ

3–30 years band-pass (A.D. 1950–2010)

0.37

0.35

0.39

5–30 years band-pass (A.D. 1950–2010)

0.36

0.40

0.44

3–30 years band-pass (A.D. 1950–1987)

0.55*

0.61**

0.60**

5–30 years band-pass (A.D. 1950–1987)

0.54*

0.67*

0.69**

3–30 years band-pass (A.D. 1988–2010)

0.22

0.11

0.15

5–30 years band-pass (A.D. 1988–2010)

0.20

0.17

0.17

  1. * 0.05 significant level using estimates of degree of freedom
  2. ** 0.01 significant level using estimates of degree of freedom
  3. + means the following year
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