Sentences with phrase «when ice age cycles»

When ice age cycles are concerned Milankovitch cycles and feedback through CO2 are surely involved, but — Milankovitch cycles are weak, at least on global level.

Not exact matches

When she estimated the ages of abyssal hills flanking the ridge, she found that they matched the strong 100,000 - year ice age cycle.

Many large mammals became extinct when these cycles and the ice age ended and spreading peatlands and rising sea levels restricted animals» ability to move between continents.

The glaciation was favored by an interval when the Earth's orbit favored cool summers but Oxygen isotope ratio cycle marker changes were too large to be explained by Antarctic ice - sheet growth alone indicating an ice age of some size.

Moreover, random interactions within the sun's magnetic field can flip the fluctuations from one cycle length to the other, matching the paleo - temperature record for ice ages on Earth for over the past 5.3 million years, when ice ages occurred occurred roughly every 41,000 years until about a million years ago when they switched to a roughly 100,000 - year cycle.

I have to this date never seen these variations in actual solar activity / cosmic ray flux taken into account when modelling previous ice age cycles, which I find deeply concerning.

We know there have been previous ice ages and subsequent warming cycles; we know when they were, and how much time elapsed between them.

-- which by the way is an argument for why the Ruddiman hypothesis for an «expected» ice age is not valid - we should be «expecting» a 40,000 year warm period similar to what was recently discovered at Vostok for the time ~ 400,000 years ago when we were last at this point in the eccentricity cycle!)

People have ignored the fact that when we started «contributing» CO2 at such an accelerated rate we were already at the «local maximum» of the carbon / ice age cycle (Link: / / en.wikipedia.org/wiki/Image:Vostok-ice-core-petit.png) What Hansen is saying is the only real choice if we don't want to radically change the planet's climate.

PS Precession cycles continue to affect low - latitude monsoons even when the Earth is not vascillating between ice ages and interglacials.

The temperature changes are related to the milankovitch cycles causing solar changes which cause increases in CO2 and further temperature increases (when ice ages end).

[Response: That is a positive feedback that acted during ice age cycles: when it got warmer at the end of an ice age, this led to release of stored CO2 from the deep ocean, thus raising atmospheric CO2 levels.

; possibly only when the eccentricity is large can the ice age be ended during the necessary phase of the precession cycle.

My other point to him at the time was that the Industrial Revolution was actually quite limited and that it wasn't until the forties last century that industry spread, but he ignored this as he ignored the email about getting rid of the MWP and LIA and when I found the Vostok data, and began to appreciate the great cycles within our Ice Age, he dismissed these too and came back to the claim that our temps had been «flat normal» and our fault that we were changing this by our increased production of carbon dioxide as the Hockey Stick showed.

This isn't proof that the world is entering a global cooling cycle, but the absence of sunspots is the most prolonged in a century, and scientists say the reduced solar activity is reminiscent of the Maunder Minimum, between 1645 and 1715, when the Northern Hemisphere suffered through the coldest weather, worst storms and shortest growing seasons of the Little Ice Age..

Such things as the closing of the isthmus of Panama, and the thrusting of the Himalyas 10 km into the equatorial atmospheric winds, seem to have been what initiated the onset of the current cycles of ice ages, while when the Panama gap was open and warm currents could flow round the world, the earth was warmer than today.

It was a surprise when evidence turned up, around the end of the 19th century, that the recent glacial epoch had been made up of several cycles of advance and retreat of ice sheets — not a uniform Ice Age but a series of ice agice sheets — not a uniform Ice Age but a series of ice agIce Age but a series of ice agice ages.

This is the case in the Little Ice Age, when the lows of all three cycles took place in close succession, contributing to make this the coldest period in the Holocene, bringing it to the brink of triggering a glacial period.

We have no idea when the Modern Warming will end, or whether it already ended a decade ago, but ice core studies suggest several hundred years of warming, followed by several hundred years of cooling, are typical of historical climate cycles between the ice ages..

Co2, coming out of an ice age, is released from the ocean sink and part of the natural cycle when coming out of an ice age.

Three years ago, University College London professor Chronis Tzedakis had just explained the basic cycles of an ice age to an undergraduate geology class; how the Earth goes through periods of glaciation followed by warmer periods when glaciers melt.

While the earth does not exit an Ice Age every 41k years according to the obliquity cycle when it achieves it's maximum angle of > 24 degrees, over the 10 recorded Ice Age events, EVERY TIME WITHOUT FAIL as obliquity drops below 23.5 % an Ice Age STARTS.

And that isn't the peak of the interglacial, that is just the point in the cycle when we started emerging from the ice age.

Note the record of the last «Ice - age cycle»: we «eyeball» that the temperature revolves around a stable mean (when we «imagine» the other Ice age cycles).