Fig. 4: The matching of δ18O ice core depth series with its corresponding three modes in the D1 interval. | npj Climate and Atmospheric Science

Fig. 4: The matching of δ18O ice core depth series with its corresponding three modes in the D1 interval.

From: A reconstructed PDO history from an ice core isotope record on the central Tibetan Plateau

Fig. 4

a The QT ice core δ18O depth series (gray line) and the dating result (red dotted). b The annual mode (IMF4). c The biennial mode (IMF3). d The ENSO mode (IMF2). e The ENSO index. To align the peak (or minimum) in the ENSO index time series with that in the ENSO mode (IMF2) with depth, and therefore the time coordinates of ENSO index are not in linear scale.

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