Sentences with phrase «precession forcing»

Vetoretti and Peltier (2004) found that glacial inceptions can be caused either by a strong obliquity forcing or by a combination of eccentricity - precession forcing and low CO2 values, which is in line with results from Berger and Loutre (2001) who found that CO2 is important during times like the MIS - 11, when the insolation variations are too small to drive glacial - interglacial cycles.

13:00 - 13:15 Precession forcing of fire activity in subtropical southern Africa over the past 170,000 years Anne - Laure Daniau, Maria Fernanda Sánchez Goñi, Philippe Martinez, Dunia H. Urrego, Viviane Bout - Roumazeilles, Stéphanie Desprat, Jennifer Marlon

Not exact matches

The precession of the equinoxes is caused by the differential gravitational forces of the Sun and the Moon on the Earth.

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Re 92 and 105: First I just want to reitterate more generally what 105 said — Milankovitch cycles have had climate signals, in ice ages or otherwise, — well probably ever since the Moon formed, although the signal from times past will not always reach us, but I've read of evidence of Milankovitch precession cycle forcing of monsoons in lakes in Pangea (PS over geologic time the periods of some of the Milankovitch cycles have changed as the Moon recedes from the Earth due to tides).

Hence over the Plio - Pleistocene, East African climate is best characterised as a long - term trend towards increasing aridity punctuated by periods of precession - forced high rainfall leading to the periodic appearance of deep freshwater lakes.

CO2 provides only a minor effect in the obliquity and precession timescale band, but over 30 % of the forcing in the 100 kyr band, so it is a key forcing agent that allows us to explain the magnitude of glacial - interglacial temperature variations.

Hominin expansion and diversification seem to be associated with climate pulses characterized by the precession - forced appearance and disappearance of deep EARS lakes.

Raypierre also mentions an interesting idea (p. 467 of his textbook) about variations in precession and eccentricity largely cancelling due to Kepler's law, leaving variations in obliquity (~ 40kyr) as the largest effective forcing, with some nonlinearity (CO2?)

Those forces and motions are driven by the following: First, the motions of the Earth relative to the Sun: the periodic changes in its elliptical orbit, its rotation about its polar axis, changes in the tilt of that axis, and the precession of that axis.

The concomitant quaternary glaciations on mars suggest response to changes to an external forcing, such as solar obliquity or precession, the concomitant changes to the martian prescape as of earth, to say obliquity would be remarkable coincidence of chance.

In fact it simplifies analysis of Milankovich forcing to consider precession modulation and eccentricity as one and the same phenomenon.

The magnetic force coordinates the precessions of protons in hemoglobin and other bodily stuffs to make them emit radio signals strong enough for the equipment to respond to.

Planetary gravity forces from the outer 4 planets over 100,000 years gradually change the shape of Earth's orbit from circular, to elliptical along with shorter term changes in the inclination angle and winter precession timing.

Isotopius @ 105 I know Eric is going to address this, but Isotopius might like to consider Peter Huyber's latest paper, in the current edition of Nature, which effectively concedes that precession, tilt and eccentricity all play a role in the climate forcing of the last 1Ma.

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.

Simulation of non-linear accumulation and bioturbation effects on precession - forced basinal carbonate cycles demonstrate that variance can be transferred from the precession into the eccentricity band18, generating «redder», i.e., higher ρ1 values.

There are two key precession effects: axial precession (see an animation here), in which the torque of the other planets exerted on the Earth's equatorial bulge forces the rotational axis to «wobble» like a spinning top; there is also an elliptical precession, in which the ellipse of the Earth itself rotates about one focus.

Obliquity and precession variations arise due to the torque exerted by gravity (i.e., a force that acts perpendicular to he spin axis of the top) which ultimately comes from the pull of the Sun and Moon on Earth's equatorial bulge.