This climatic event was probably a result of predictable changes in the Earth's orbit (Milankovitch cycles) and a continuation of changes that caused the end of the last glacial period.
The effect would have had maximum Northern Hemisphere heating 9,000 years ago when axial tilt was 24° and nearest approach to the Sun (perihelion) was during boreal summer. The calculated Milankovitch Forcing would have provided 8% more solar radiation (+40 W/m2) to the Northern Hemisphere in summer, tending to cause greater heating at that time. There does seem to have been the predicted southward shift in the global band of thunderstorms called the Intertropical convergence zone.
However, orbital forcing would predict maximum climate response several thousand years earlier than those observed in the Northern Hemisphere. This delay may be a result of the continuing changes in climate as the Earth emerged from the last glacial period and related to ice-albedo feedback. It should also be noted that different sites often show climate changes at somewhat different times and lasting for different durations. At some locations, climate changes associated with this event may have begun as early as 11,000 years ago, or persisted until 4,000 years before present. As noted above, the warmest interval in the far south significantly preceded warming in the North.
Read more about this topic: Holocene Climatic Optimum
Other articles related to "milankovitch cycles, cycle, cycles, milankovitch cycle":
... The Milankovitch cycles are a set of cyclic variations in characteristics of the Earth's orbit around the Sun ... Each cycle has a different length, so at some times their effects reinforce each other and at other times they (partially) cancel each other ... There is strong evidence that the Milankovitch cycles affect the occurrence of glacial and interglacial periods within an ice age ...
... Other planets in the Solar System have been discovered to have Milankovitch cycles ... Mostly these cycles are not as intense or complex as the Earth's cycles, but do have a global geological impact with respect to the movement of mobile solids like Water or Nitrogen ices or hydrocarbon lakes ... polar caps vary in extent due to orbital instability related to a latent Milankovitch cycle Saturn's moon Titan has a ~60,000-year cycle that ...
... Main articles Milankovitch cycles and orbital forcing See also 100,000-year problem The role of Earth's orbital changes in controlling climate was first advanced by James Croll in the late ... these irregularities in Earth's orbit could cause the climatic cycles known as Milankovitch cycles ... in the orbital eccentricity of Earth occur on a cycle of about 100,000 years ...
Famous quotes containing the word cycles:
“The stars which shone over Babylon and the stable in Bethlehem still shine as brightly over the Empire State Building and your front yard today. They perform their cycles with the same mathematical precision, and they will continue to affect each thing on earth, including man, as long as the earth exists.”
—Linda Goodman (b. 1929)