Sentences with phrase «inter-hemispherical changes in insolation»

A 2000 - year transient climate simulation with the Community Climate System Model shows the same temperature sensitivity to changes in insolation as does our proxy reconstruction, supporting the inference that this long - term trend was caused by the steady orbitally driven reduction in summer insolation.

These are thought to be driven by the large regional changes in insolation driven by orbital changes.

For Milankovitch cycles, the proximate cause is changes in insolation, especially in the Northern Hemisphere.

Changes in insolation are also thought to have arisen from small variations in solar irradiance, although both timing and magnitude of past solar radiation fluctuations are highly uncertain (see Chapters 2 and 6; Lean et al., 2002; Gray et al., 2005; Foukal et al., 2006).

You don't get the minor changes in insolation from Milankovitch cycles causing glacial - interglacial cycles.

And perhaps you can explain how tiny changes in insolation in the course of Milankovitch cycles give rise to glacial / interglacial cycles without significant positive feedback.

If you combine orographic effects with changes in insolation, is this enough to initiate the temperature rise?

It's the same series of an initial forcing (change in insolation due to Milankovitch orbital cycles) being amplified by reinforcing feedbacks (change in albedo, change in temperature and partial pressure regulating both CO2 and H2O), but in reverse from an exit from a glacial period.

Re # 20: I think the trick with this is that effects from changes in insolation don't lag in that way.

The change in insolation due to orbital changes are significant, of the order of 50 W / m2, or 50 times larger than the change of TSI over the solar cycle.

How do monsoons and the intertropical convergence zone respond to the changes in insolation that accompany variations in Earth's orbit around the sun?

Past and future changes in insolation can be calculated over several millions of years with a high degree of confidence.

Seasonal changes in insolation are much larger than annual mean changes and can reach 60 W m — 2 (Box TS.6, Figure 1).

But it doesn't make all that much difference to global warming anyway, because the total peak - to - trough change in insolation over a complete solar cycle is only about 1 % anyway.

The summer - winter changes in insolation are much larger than those due to human - induced greenhouse gas changes; the seasonal change is mainly in the visible part of the electromagnetic spectrum while the greenhouse gas forcing is in the infrared; the greenhouse gas influence is global while the seasonal changes are opposite in the two hemispheres; and we have a much longer history of observing the seasonal changes, so a more or less correct prediction can be made empirically, without any physical understanding.

This major oscillation may be related to a non-linear response of the climatic system to the gradual decrease in insolation, in addition to seasonal and inter-hemispherical changes in insolation.

Another major climate oscillation around 7500 — 7000 cal BP may have resulted from combined effects of a strong rate of change in insolation and of variations in solar activity.»

There are Milankovitch cycles of around 21,000, 40,000, 100,000, and 400,000 years — in the 100,000 year cycle involving orbital eccentricities the change in insolation is much smaller than with the 21,000 and 40,000 year cycles.

What we know with some certainty about oceans (if data is to be believed) is that the intra-annual change in the insolation effects (suspiciously) high symmetricity in the N. Atlantic's sea surface temperature, cantered on 1st of March and 31st of August.

Changes in insolation due to the sun's orbital cycles, or Milankovitch cycles, correspond with the recent 100,000 - year cycles of past major ice ages.

But equally important changes in insolation affected the volume of warmer tropical waters that were transported toward the poles.

This is similar to the error they make when they claim that greenhouse gases can produce temperature increases 3 - 5 times that of the direct radiative effects of doubling CO2 (through the action of non-linear feedbacks), but deny that small changes in insolation can produce effects that are much larger than can predicted from the original forcing.

``... climate oscillation around 7500 — 7000 cal BP may have resulted from combined effects of a strong rate of change in insolation and of variations in solar activity.»

Yes, of course the net effect (i.e. the summed change in insolation) is very near to zero.

Yes in fact we know that the paradigm of only the globally average TOA radiative forcing mattering must be erroneous as it fails to explain how Milankovitch forcing (changes in insolation) causes the glacial interglacial cycles, when it is a forcing which is tiny on a global scale (even hemisphericaly completely out of phase!)

To develop an understanding of how the CSI affects the climate will require the development of new models (evolved from the present GCM efforts) incorporating gradual changes in insolation and ice and snow coverage and following the various influences on the climate over many annual cycles.

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.

Of course, DS can (and should already have) calculated the change in insolation at the northern spring equinox over the last thousand (or two thousand) years, and plotted it against changes in temperature over the same period.

Those for Summer and Winter are not, but the seasonal change in insolation for those times of year is small.

What's not insignificant is the change in insolation between perihelion and aphelion where one loses almost precisely what the other gains.

The local effects of the eclipse and the discussion of temperature drops are simple confirmation that it is changes in insolation that control Earth surface temperatures not the tiny changes in the output of the Sun.

Small changes in insolation driven by changes in the Earth's orbit can push the planet into or out of an ice age through the planet's «climate feedback» mechanisms.

The effect seems more pronounced towards the poles, where growth is more restricted and changes in insolation may have their largest effect.

A similar water - induced sensitivity effect also magnifies changes in insolation, etc..

Much higher above I mentioned the possibility — but again the change in insolation over the Holocene (even at 65N) is very small.

Causes of radiative forcing include changes in insolation and the concentrations of radiatively active gases, commonly known as greenhouse gases and aerosols.

The essential condition may be orbital cycles and slow changes in insolation in high latitudes — but the glacial trigger is likely to be warmth itself freshening and warming the Arctic ocean.

This theory predicts (extremely accurately as it happens) that known variations in the orbit of the Earth bring us closer or move us further away from the sun creating really quite small changes in insolation.

The fact that our climate swings backwards and forwards between extreme ice ages and warm inter-glacials as a reaction to quite modest but sustained changes in insolation shows this effect.

He argues that the total change in insolation caused by orbital changes is minimal (which is true), and therefore CO2 is the main driver of climate.

Yet some people all too readily abandon logic and take that to mean that increasing CO2 in the absence of a initial change in insolation will not warm the atmosphere and thereby change climate.

Furthermore, these cycles cause huge (tens of watts / m ^ 2) changes in insolation, which means there is a clear physical mechanism for their influence on climate.

Nor did you do a search, which would have turned up: http://www.realclimate.org/index.php/archives/2007/04/the-lag-between-temp-and-co2/ which would have explained that in fact, contrary to the propaganda from your neocon mothership, Gore does in fact mention the lag and correctly attributes the reason to the fact that initial warming in past epochs was most often to slight changes in insolation.

The accuracy of the chronology allows us to examine the phase relationships between climate records from the ice cores and changes in insolation.

It would even be hard to know whether a change in insolation was caused by changes in the Earth's tilt / orbit, i.e. Milankovitch forcing, or cloud changes.

Only changes in insolation can affect this global feature.

Not exact matches

Furthermore, while the deep wind is stable, in the upper atmosphere the speed and width of the equatorial stream are highly changeable, perhaps due to the seasonal insolation cycle on Saturn, and their intensity is increased by the changing shadowing of the rings above the equator.

One explanation is the change in solar insolation, or the amount of the sun's energy that hits the Earth.

We conclude that ENSO was sensitive to changes in climate boundary conditions during the Holocene, including, but not limited to insolation.

On p. 336: 271 Abrupt change from wet to dry in the Sahara (at least, as measured by offshore dust) as the summer sun gradually changes: Peter B. deMenocal, J. Ortiz, T. Guilderson, J. Adkins, M. Sarnthein, L. Baker, and M. Yarusinsky, «Abrupt onset and termination of the African Humid Period: Rapid climate responses to gradual insolation forcing,» Quaternary Science Review 19: 347 - 361 (2000).