Sentences with phrase «orbital precession cycles»

Marine and terrestrial sediment sequences demonstrate that subtropical African climate periodically oscillated between markedly wetter and drier conditions, paced by earth orbital precession cycles recurring roughly every 20 kyr (Lourens et al., 1996).

Not exact matches

In particular, there was no sign of climate change in Indonesia associated with Earth's orbital precession, a wobble caused by Earth's axis tilt that generates differences in sunlight in a 21,000 - year cycle.

The Earth's natural orbital cycles [precession] were driving a simultaneous natural cooling trend, especially at high northern latitudes.

And, orbital tuning won't create exactly the * combination * of frequencies (as is clearest with precession cycles) that match the astronomical cycles.

Precession refers to the fact that both Earth's rotational axis and orbital path precess (rotate) over time — the combined effects of these two components and the eccentricity produce an approximately 21,000 - year cycle.

Precession, of course, is but one of three orbital eccentricities collectively known as Milankovitch cycles.

Atmospheric dynamics, solar cycles, Milankovic factors respecting Earth's axial tilt, orbital eccentricity, equinoctial precession etc. remain constant in historical context and perspective.

Might the «weather» of orbital cycles be impacted by K / T but not the «climate» — perhaps the trajectories of obliquity, precession and eccentricity would become completely different given sufficient time, but maybe with the same general character — periods and amplitudes and average values being similar enough that a casual glance at any given time segment (on the necessary scale to characterize the orbital cycle «climate») wouldn't look like anything different.

The 23,000 - year and 41,000 - year cycles are driven ultimately by two components of Earth's orbital geometry: the equinoctial precession cycle (23,000 years) and the axial - tilt cycle (41,000 years).