Sentences with phrase «orbital precession»

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).

Merlis, T. M., T. Schneider, S. Bordoni, and I. Eisenman, 2013: Hadley circulation response to orbital precession.

Merlis, T. M., T. Schneider, S. Bordoni, and I. Eisenman, 2013: The tropical precipitation response to orbital precession.

But orbital precession occurs only when two black holes have axes of rotation that point in random directions, and it disappears when the axes are both perpendicular to the orbital plane.

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.

Not exact matches

The double pulsar PSR J0737 — 3039A / B consists of two neutron stars in a highly relativistic orbit that displays a roughly 30 - second eclipse when pulsar A passes behind pulsar B. Describing this eclipse of pulsar A as due to absorption occurring in the magnetosphere of pulsar B, we successfully used a simple geometric model to characterize the observed changing eclipse morphology and to measure the relativistic precession of pulsar B's spin axis around the total orbital angular momentum.

The researchers determined that the precession of the pulsar's orbital axis advances by 4.77 degrees per year, plus or minus 0.66 degrees.

One phenomenon that Sathyaprakash is eager to observe is a «precession» of the black holes» orbital plane, meaning that their paths trace a kind of 3D rosette.

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

It is believed that the PETM was likely initiated by changes of the orbital parameters of the Earth (eccentricity, obliquity and precession of axis) causing an increase in the intensity and distribution of solar radiation reaching the earth (Sexton et al, 2011).

As the Earth orbits the sun, the gravitational tug of the other planets slightly alters orbital characteristics (precession, tilt, ellipticity) on a timescale of tens of thousands of years.

For the 150 year model what is modelled for short term orbital fluctuations: eg daily rotation, monthly moon gravity effects on precession etc, yearly elliptical orbit effects for an assumed fixed elliptical orbit, yearly tilt and precession impacts etc?

The Pleistocene ice ages seem to correlate with periodicities in the Earth's orbital eccentricity, axial tilt, and precession.

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

You must have failed to notice Coby that in those articles I link to (* & 312) I do mention that ONE «oscillator» is a TRIVARIATE of planetary orbital variation, planetary axial precession and Solar Climate as concerned with TOTAL, and Spectral division of, Solar energy output.

Lisiecki et al. (2008) analysed orbital responses in proxy indicators of oceanic overturning and found that the AMOC is sensitive to maxima in the obliquity and precession components of the Earth's orbit around the Sun.

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.

It is obvious from orbital considerations why precession modulation should follow eccentricity.

In hip nomenclature, I would be a near perfect «flat - earther» in the blatant perfect pretzel logic that would make such an assignation applicable to one that comprehends the pacing of our climate by the 3 orbital variables of precession, obliquity and eccentricity.

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.

He doesn't identify eccentricity as such in the title of the paper, but it is there in his orbital forcing model, as the amplitude modulation of precession, and needed for his model to work.

It has been suggested that Stage 11 was an extraordinarily long interglacial period because of its low orbital eccentricity, which reduces the effect of climatic precession on insolation (Box 6.1)(Berger and Loutre, 2003).

Given that current low orbital eccentricity will persist over the next tens of thousand years, the effects of precession are minimised, and extremely cold northern summer orbital configurations like that of the last glacial initiation at 116 ka will not take place for at least 30 kyr (Box 6.1).

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).