Sentences with phrase «orbital changes warm»

Not exact matches

The Arctic took another 3,000 - 4,000 years to warm this much, primarily because of the fact that the Northern Hemisphere had huge ice sheets to buffer warming, and the fact that changes in ocean currents and Earth's orbital configuration accelerated warming in the south.

Scientists knew about the warming effects of greenhouse gases, but proponents of global cooling argued that greenhouse warming would be more than offset by Earth's orbital changes.

This may help explain some of the changes that are not explained by the orbital curves in the other thread, especially the initiation of warming and cooling since the GCR effects can be much more powerful (partly forcing as postulated in the paper, but also amplification of the weaker orbital forcing).

Periods of volcanism can cool the climate (as with the 1991 Pinatubo eruption), methane emissions from increased biological activity can warm the climate, and slight changes in solar output and orbital variations can all have climate effects which are much shorter in duration than the ice age cycles, ranging from less than a decade to a thousand years in duration (the Younger Dryas).

While natural global warming during the ice ages was initiated by increased solar radiation caused by cyclic changes to Earth's orbital parameters, there is no evident mechanism for correcting Anthropogenic Global Warming over the next several cenwarming during the ice ages was initiated by increased solar radiation caused by cyclic changes to Earth's orbital parameters, there is no evident mechanism for correcting Anthropogenic Global Warming over the next several cenWarming over the next several centuries.

Predicted changes in orbital forcing suggest that the next glacial period would begin at least 50,000 years from now, even in absence of human - made global warming (see Milankovitch cycles).

The theory suggests that the system is pushed by greenhouse gas changes and warming — as well as solar intensity and Earth orbital eccentricities - past a threshold at which stage the components start to interact chaotically in multiple and changing negative and positive feedbacks — as tremendous energies cascade through powerful subsystems.

I don't think there was much prior uncertainty in the literature over the general notion that orbital forcing changes were an initiating factor and that consequent rises in CO2 contributed a major subsequent warming influence, but the timing (regional vs global) and the interaction between the hemispheres has not been well illuminated.

> More sunshine from orbital changes produces warming.

As temperatures warmed slightly due to insolation changes caused by orbital cycles, ice sheets retreated slightly.

Just a quick note to say that the paleoclimate data for earlier warm periods 125,000 years ago and even 8 - 10,000 years ago in northern Alaska (paleoclimate warmer than now, [from] different forcings) document the northward advance of the treeline from Nome to Barrow, Alaska, and the Canadian border at different times of change in Earth's orbital parameters (without a significant change in CO2).

And if the orbital change produces a warming less CO2 dissolves in the ocean and enhances the warming.

As these particular events took place at the end of a local warm period caused by orbital forcing (see Box 6.1 and Section 6.5.1), these observations suggest that under gradual climate forcings (e.g., orbital) the climate system can change abruptly.

For the mid-Holocene, coupled climate models are able to simulate mid-latitude warming and enhanced monsoons, with little change in global mean temperature (< 0.4 °C), consistent with our understanding of orbital forcing.

This change in sea level occurred in the context of different orbital forcing and with high latitude surface temperature, averaged over several thousand years, at least 2 °C warmer than present.

So even though past warm episodes may have been initiated by orbital changes that caused warming and thus caused CO2 to rise, which then led to more warming, we know that the current warm episode is being driven by increasing CO2 due to the burning of fossil fuels and the clearing of forests.

The orbital changes that caused the ice ages are far too weak and slow to cause a warming as rapid as the current one.

CO2 acts there as a feedback, with warmer / colder oceans holding less / more CO2, and changing CO2 concentrations along with (lagging) temperature changes induced by (forced by) insolation changes due to orbital mechanics.

As the Earth came out of the ice age the primary forcing which caused the initial warming was due to changes in the Earth's orbital pattern.

The main reason for this warmer climate was an increased amount of energy from the Sun being received at high northern latitudes due to Earth's orbital configuration, plus Earth had an increased capacity to absorb heat due to vegetation changes and reduced ice and snow cover.

The theory suggests that the system is pushed by greenhouse gas changes and warming — as well as solar intensity and Earth orbital dynamics — past a threshold at which stage the components start to interact chaotically in multiple and changing negative and positive feedbacks — as tremendous energies cascade through powerful subsystems.

The theory suggests that the system is pushed by greenhouse gas changes and warming — as well as solar intensity and Earth orbital eccentricities — past a threshold at which stage the components start to interact chaotically in multiple and changing negative and positive feedbacks — as tremendous energies cascade through powerful subsystems.

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.

The change in water vapour content will reinforce the warming from orbital change until cloud increases and sets in the negative feedback.

The INITIAL cause of the warming was a change in orbital parameters.

You describe changes in the Earth's albedo at various places which no doubt will increase the warming from the initial solar or orbital event.

When orbital wiggles and rising greenhouse gases warmed the earth from the last ice age, proxy records show that smooth changes were interspersed with abrupt coolings and warmings, wettings and dryings.

Have a look at this updated version of one of the articles here about past temperatures, it has good graphics and more detail about determining the past, plus links to good sources: http://gristmill.grist.org/story/2006/10/26/20495/240 The warming that ended the ice age was caused by changes in the earth's orbital inclination (Milankovich cycles).

Posted in Musings, Science Lessons, tagged astronomy, climate change, education, fantasy, game of thrones, george r r martin, glaciers, global warming, hbo, ice age, orbital mechanics, science, song of ice and fire on June 2, 2014 8 Comments»

Even if warming episodes were initiated by orbital changes, the warming itself would cause the release of greenhouse gases from sources including the oceans and melting permafrost.

This may help explain some of the changes that are not explained by the orbital curves in the other thread, especially the initiation of warming and cooling since the GCR effects can be much more powerful (partly forcing as postulated in the paper, but also amplification of the weaker orbital forcing).