Fig. 9: Thirty years running sum of various indices relating to ENSO.
From: A reconstructed PDO history from an ice core isotope record on the central Tibetan Plateau
From top to bottom: the number of El Niño events in all 30 years period from 1900-1929 CE through to 1982-2011 CE ((No.) EN, red), the number of La Niña events in each 30 years period ((No.) LN, blue), the difference ((No.) EN-(NO.) LN, pink).
