when the pdo last switched to a cool phase, global temperatures were about 0.4c cooler than currently.
when the pdo last switched to a cool phase, global temperatures were about 0.4c cooler than currently.
pacific decadal oscillation:5
pacific decadal oscillation
during a "warm", or "positive", phase, the west pacific becomes cooler and part of the eastern ocean warms; during a "cool" or "negative" phase, the opposite pattern occurs.