A 50-70 year climatic oscillation
over the North Pacific and North America.
Several years of climatic oscillation
could kill billions of people.
at the onset of the Mesozoic inferred from palynological records from the North Indian Margin.
These climatic oscillations
are known as Dansgaard-Oeschger events, and when such an event was in its warm phase in Greenland, temperatures would decrease in Antarctica around 200 years later; cold phases, which would cause temperatures in Greenland to plummet, would lead to warmer temperatures in Antarctica about 200 years afterward.
A recent research tendency is to examine the intended ENSO relations together with other large-scale climatic oscillations
, like Pacific Decadal Oscillation (PDO) and North Atlantic Oscillation (NAO) (e.g., Kim et al., 2008; Tootle and Piechota, 2006).
Therefore, ENSO-related climatic oscillations
must have had significant impacts on human populations, primarily affecting the resource base in terms of the long and short-term availability, stability and structuring of these resources (e.g.
Establishing the exact role that atmospheric C[O.sub.2] played in past natural climatic oscillations
, however, is not a simple matter.