Sentences with phrase «half precessional»

I am assuming the similarity of the «low eccentricity and consequently weak precessional forcing» in the current interglacial and during MIS 11.

The alignment of obliquity and eccentricity due to precession is a much stronger effect than for the Earth, leading to «great» summers and winters on time scales of tens of thousands of years (the precessional period is 170,000 years).

You'd better learn something about Milankovic forcing, and what the ocean does to average the precessional cyle out, and how it depends on latitude.

Raymo and Paillard have a good story about the 100KYr cycle arising from the modulation of the precessional cycle by the changes in the Earth's orbital eccentricity, coupled with some glacial dynamical effects which «rectify» the high frequency precessional signal.

The main changes in radiative forcing from the precessional cycle are in the latitudinal and seasonal distribution, not in the global mean, which is why the nature of the response can be expected to be different from doubling CO2.

The alignment of obliquity and eccentricity due to precession is a much stronger effect than for the Earth, leading to «great» summers and winters on time scales of tens of thousands of years (the precessional period is 170,000 years).

The climate change in this period is generally believed to be associated with precessional changes in the distribution of solar radiation, which primarily affect land - sea temperature contrast, and give only a regional warming, plus an enhancement of certain monsoonal circulations.

That would account for the relative strengths of the obliquity and precessional signals in the data.

You'd better hope that the rebound from the coldest depths of the half precessional Holocene was natural, because if man did the heavy lifting of warming, then we really can't keep it up much longer.

Actually, the oceans have a seesaw where the SH oceans warm more during this phase of the precessional cycle.

'' The dominant forcing factor appears to be precessional insolation; Northern Hemisphere summer insolation correlates to at least the early to middle Holocene climate trend.

The surface of the oceans are always warmer than the depths of the oceans > If you change the mixing efficiency, by shifting atmospheric circulations with solar precessional cycle for example, the mixing efficiency changes and the regions where precipitation falls changes.

Should that trend due to the 24 k year precessional cycle be discounted in your view?

Earth eccentricity cycles modulate the amplitude of precessional forcing of the African monsoonal rains (see upper right panel), and deep lake conditions are observed in several East African basins during some (not all) eccentricity maxima over the 5 Ma (deMenocal, 2011; Trauth et al., 2005; Kingston et al., 2007)

That shift coincides with the southern hemisphere receiving higher TSI due to the precessional cycle.

If you think of the precessional cycle as four seasons instead of just the 65N TSI peak, you have Hot Summer / Cold Winter, Warm Spring / Cool Fall, Mild Summer / Mild Winter Cool Spring / Warm Fall.

I have been thinking along these same lines (periodic orbital and precessional gravitational forces triggering plate tectonic activity) for over twenty years, although I must say that an effect from sea level variations hadn't occurred to me.

Because precessional forcing over the Holocene is opposite for the two hemispheres, both Southern Hemisphere and Northern Hemisphere should be shown.

And the much longer term ice - age and magnetic cycles may well be regulated by the Earth's precessional cycle (and this is not simply an effect of «geometry»).

Extreme weather is the name of the game when seven of the past eight interglacials underwent glacial inception at their half precessional ages.

The average is more like 14 - 15 kyr (a precessional cycle, BTW, since you know all about Milankovich cycles), but the standard deviation is about 10,000 years.

The interglacial thus lasts an additional precessional cycle, yielding a total duration of 28 kyr.