Fig. 5.
Examples of non-Trp spectra in GISP2 ice. (a) Abrupt changes in spectral shapes in 5-cm (≈10-year) intervals at 2,679 m. (b) Abrupt changes in spectral shapes ≈2,464.24 m (5 cm ≈ 8 years) where the Z2 volcanic ash layer was found.
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