Timeseries: down/upwards - Ocean currents cycle between warmer (el Niño) and cooler (la Niña) periods

A timeseries of monthly Oceanic Niño Index values from 1950 to 2023. The y-axis is mirrored at 0, with positive teal values indicating el Niño periods and negative lavender values corresponding to la Niña periods. The chart sits over a watercolor wash that has a gradient from teal at the top to lavender at the bottom. The ocean current-driven periods cycle every couple years, and we are currently in a la Niña period.