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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Geoscience Letters Cover Image

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