Sentences with phrase «precession insolation»

4 - World wide melting of ice happens when precession insolation is on a decreasing trend..

4 - World wide melting of ice happens when precession insolation is on a decreasing trend..

Not exact matches

Precession dominates * midsummer * high - latitude insolation (the usual Milankovitch metric), but obliquity has a stronger influence on Huybers» notion of «summer heat» (which takes into account the astronomical influence on length - of - season.

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.

During periods of low eccentricity, such as about 400,000 years ago and during the next 100,000 years, seasonal insolation changes induced by precession are not as large as during periods of larger eccentricity (Box TS.6, Figure 1).

For example, average insolation on the 21st day of June at 65 - N has 80 % of its variance at the precession periods (1/21 ky + / - 1/100 ky).

The caloric summer half - year at 65 - N, defined as the energy received during the half of the year with the greatest insolation intensity (4), also has more than half its variance in the precession bands.

While it is possible that the less significant, and originally overlooked, inclination variability has a deep effect on climate, [11] the eccentricity only modifies insolation by a small amount: 1 — 2 % of the shift caused by the 21,000 - year precession and 41,000 - year obliquity cycles.

This theory stipulates that changes in Earth's elliptical orbit around the sun (eccentricity), changes in the direction in which our axis points (precession) and changes in the tilt of the earth itself (obliquity)-- known as Milankovitch Cycles — should contribute to changes in climate because of the different amounts of solar insolation received during these changes.

yr BP because of the weakening Northern Hemisphere insolation most likely related to the current precession circle.

Here it is shown that the precession of perihelion occurring over a century substantially affects the intra-annual variation of solar radiation influx at different locations, especially higher latitudes, with northern and southern hemispheres being subject to contrasting insolation changes.

The small changes in insolation will cause earlier and more extensive spring melting of Arctic ice, and indeed less ice formation over winter because northern winters are now shorter and milder than they were in 1750, due to apsidal precession.

For precisely the same core reason (apsidal precession) the opposite occurs in the southern hemisphere: less insolation at far southern latitudes, sea ice melting delayed, albedo increasing, less energy absorbed: growing sea ice: the ice albedo feedback effect acting negatively.

O yes and it helps of the radiative peak coincides with a peak of maximal precession amplitude and 65N summer insolation.

Vegetation changes suggest that they constitute distinctive climatic states established by insolation conditions from the obliquity and precession cycles (figure 47).

(This would also include insolation at 65N, which exactly follows eccentricity and precession modulation.)

E.g. anthroprogenic fossil fuel combustion and solar / cosmic ray variation / earth precession impacting insolation and clouds and consequently land and ocean circulation and temperature driving and temperature dependent microbial decay driving CO2 emissions, and CO2 / temperature driven biomass growth?

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).

In a linear version of the Milankovitch theory, the two shorter cycles can be explained as responses to insolation cycles driven by precession and obliquity.