Sentences with phrase «from glaciation»

The real interesting thing of all this, is how fast earth changes from glaciation to warm.

The last time Earth experienced a Great Dying was during a dangerous transition from glaciation and to hothouse.

e.g. models of eustacy («worldwide change of sea level as contrasted with local diastrophic uplift or subsidence of the land») vs isostacy (glacial rebound following glaciation / melting) vs local sinking / rising from glaciation / interglacial warming, CO2, and / or solar variations, and their causes.

«What makes climate change different from reestablishing from a glaciation is that these northern areas are already full,» said Hellmann.

Not exact matches

The next step will be to gather more ancient samples from before and after a major environmental change — the end of a glaciation, for example, or the arrival of humans in the New World — to see whether any epigenetic changes correlate with the environmental transition.

Linked by a single root system, Pando consists of tens of thousands of genetically identical trees, cloned from a sprout that emerged after the last glaciation in southern Utah, roughly 13,000 years ago.

Puzzled by types of mollusc that abruptly disappeared from the British fossil record, apparently in response to a glaciation, only to reappear 2 million years later completely unchanged, he asked of Darwin: «Be so good as to explain all this in your next letter.»

«In addition, this early phase of evolutionary divergence appears to have preceded the extreme climate changes that led to Snowball Earth, a period marked by severe long - term global glaciation that lasted from about 720 to 635 million years ago,» Dohrmann says.

During a period of glaciation about 660,000 years ago, Himalayan brown bears were one of the first groups to branch off and become distinct from other brown bears, the data suggest.

Records of sea surface temperature from oceanic sediment cores, for example, show that the magnitude of warming following several previous glaciations are well - correlated (www.ncdc.noaa.gov/paleo/recons.html).

The first Ediacaran to begin crawling around would have discovered a world devoid of predatory animals, with a seafloor covered either in thick bacterial mats or toxic sediment and, possibly, a climate thawing from a worldwide glaciation event known as «Snowball Earth.»

It is presumed to be a remnant population, descendant of an earlier invasion of magpies from the Old World, probably prior to the last glaciation.

Iodine Source: Seaweed, milk from cows grazed on iodine - rich coastal soil Effects of deficiency: Blindness, mental impairment, goiter Who's at risk: People living in mountainous areas (the Rockies, the Alps, and the Andes), where iodine has been washed away by glaciation and flooding, or in lowland regions far from the oceans (Central Africa and Eastern Europe) Fortification options: Salt Estimated millions of people affected: 740

«The study shows that both mechanisms must have been active from the height of glaciation until now,» said Robert Newton, an oceanographer at Lamont - Doherty who was not involved in the research.

The only place where melting methane hydrates appear to be releasing methane to the atmosphere is on the Siberian margin, where hydrates associated with the permafrost relict from the last glaciation release methane to the shallow water column of the shelf waters.

From the onset of northern - hemisphere glaciation (about 3 million years ago) to the «mid-Pleistocene transition» (about 800,000 years ago), glacial advance and retreat follows a strong 41,000 - year cycle, which has led to its being called «the 41 ky world» (Raymo & Nisancioglu 2003, Paleoceanography, 18, 1011).

«Hotspot of biodiversity as a characteristic of the Balkans was put forward by biogeographers to indicate that most of the plant and animal species that repopulated the continent after glaciations came from the Balkans,» Roksandic explained.

Timing and depositional environments of a Middle Pleistocene glaciation of northeast England: New evidence from Warren House Gill, County Durham.

During glaciation, water was taken from the oceans to form the ice at high latitudes, thus global sea level drops by about 120 meters, exposing the continental shelves and forming land - bridges between land - masses for animals to migrate.

Unless I'm missing something obvious, I don't see how one can extrapolate or estimate current climate sensitivity from the amount of temperature change to the solar forcing change that ocurred from last glaciation to the present interglacial period.

On the other hand, during those periods between widespread glaciation, the water had melted from the ice sheets and polar areas, flowed, back into the oceans and sea level was as high or higher than now.

I'm a fish geneticist so I won't bother commenting on «paleo - ocean current - ology», but it seems to me that glaciation would result in a reduction of fresh water inputs to the North Atlantic (during the ice age) and would therefore be quite different from the mechanism in question (which is related to early phases of global warming).

The only place where melting methane hydrates appear to be releasing methane to the atmosphere is on the Siberian margin, where hydrates associated with the permafrost relict from the last glaciation release methane to the shallow water column of the shelf waters.

It is to be noted here that there is no necessary contradiction between forecast expectations of (a) some renewed (or continuation of) slight cooling of world climate for a few decades to come, e.g., from volcanic or solar activity variations; (b) an abrupt warming due to the effect of increasing carbon dioxide, lasting some centuries until fossil fuels are exhausted and a while thereafter; and this followed in turn by (c) a glaciation lasting (like the previous ones) for many thousands of years.»

First, there is very little in the way of archaeological data about cvilzations during the transition from the last glaciation to the Holocene.

Be thankful that the we are insulated from the huge volume of cold waters that comprise the ocean, because if it ever became far more mixed with the surface layers we would plunge into permanent glaciation.

So, if some of these ideas on termination of glaciations are correct (ice - sheet temperature, ocean circulation and CO2), and all of these are omitted from the current model, it leaves open the possibility that a more comprehensive model would get a different result.

The glaciological community has for decades harbored the widespread belief that the thermal evolution of the ice sheet, and the effect of this evolution on ice flow, are central in the ice - age cycling (not all communities agree, but there is plenty of literature on this from the land - ice crowd), so use of a temperature - independent rheology for the ice leaves out one favored explanation for termination of extensive glaciation.

I think if it's handy to have a faux - factor for ocean heat gain % age then it's either from sea water melt / freeze temperature or the average ocean temperature during previous glaciation.

Humanity «rose» from the onset of this current period of recurring glaciations ~ 3 Million years ago, and from the above site (**): -[«During the last warm spell, 125,000 years ago, the seas were about 18 feet higher than they are today.

Jim D You still have not explained why you are working so hard to avoid warming and thus to encourage a return from the current warm interglacial period back down to the full glaciation temperatures.

The second clue is that Northern Hemisphere glaciation intensified between 3.1 and 2.5 million years ago, thanks to all the moisture delivered to the far north via evaporation from a more vigorous Gulf Stream.

C: Datasets suggesting a drying environment at 2.5 Ma, shown by λ 18O from benthic foraminifera, a proxy for global temperature, smoothed with a Gaussian window of 200 ky; eustatic sea level; and magnetic susceptibility, a proxy for ice rafted debris and Northern Hemisphere glaciation.

Is it from the depths of the last glaciation?

The glaciations and interglacials are themselves a major deviation from the «normal» Hot House condition of the planet.

The conclusion that timely anthropogenic CO2 emissions have rescued the biosphere from a long term glacial slide down to dangerously low photosynthesis - stopping CO2 levels (that were approached during the recent Wisconsin glaciation) is based on multiple independent lines of evidence and the vast body of peer - reviewed science.

For instance during glaciation there have been influenced by two causes: cooling surface waters dissolve more CO2 from atmosphere and a colder climate makes CO2 emitting from biosphere to increase, in which the dissolving of CO2 to sea surface wins the emission of CO2 from biosphere to atmosphere.

«The extrapolar glaciation of the Earth will be decaying at rapid, catastrophic rates — its total area will shrink from 500,000 to 100,000 km & sup2; by the year 2350.

Now that those «few hundred years» are «gone» from the «stick», one wonders how many MORE «committee meetings» it will take to «remove the rest»... The «drop» into the present» 3 million year» long period of recurring glaciations was sufficiently «drastic» to «reduce» bio-forms that evolved within the previous ~ 200 Million year «Primary Peak» climate behavior.

The three lines are: (1) the beginning: the Khirthar transgression and the onset of neritic carbonate accumulation in the Bartonian Age (preceding onset of the Middle Eocene climatic optimum [MECO]-RRB-; (2) the midlife change (Bartonian - Priabonian transition): the shift from carbonate - rich to carbonate - poor, higher - nutrient environments under estuarine circulation, causing widespread dysaerobia culminating in opaline silicas; and (3) the Eocene - Oligocene = Priabonian - Rupelian boundary and glaciation during oxygen isotope event Oi - 1, with return of improved ventilation in neritic environments and resumption of carbonate accumulation.

Much of Miller's work has been the articulation of Late Holocene glaciation, up to and including its relative maximum in the Little Ice Age, from which numerous Baffin Island locations are still emerging in his recent study.

So have you boffins managed to sort out whether the CO2 released from the pursuit of the good life can warm the planet sufficiently to overmatch the natural tendency toward glaciation?

North - south oscillations of greater amplitude associated with Dansgaard - Oeschger events are evident in oxygenisotope data from the Wurm - Wisconsin glaciation [15].

Natural variability and glaciation with much colder temperatures are proven major climatic problems from the geological record.

It is of primary importance to explain that climate change, and subsequent periods of glaciation, resulting from the following three variables is not due to the total amount of solar energy reaching Earth.

Assuming a full - glacial temperature lapse rate of -6 °C / 1000m, depression of mean annual temperature in glaciated alpine areas was ca 5.4 ± 0.8 °C; it is similar to values of temperature depression (5 - 6.4 °C) for the last glaciation obtained from various terrestrial sites, but contrasts with tropical sea - surface temperature estimates that are only 1 - 3 °C cooler than present.

-- these aren't contradictory results, they're (from different hemispheres, from different glaciations, from different species, from different ice cores, from....

The stuff from the mid-Pliocene appears to be frantic efforts to find a correspondence with glaciation.

Based on my study of Milankovitch cycles, the next major glaciation of the current ice age isn't really due quite some time — anywhere from 20,000 to 50,000 years from now.

In 1974 when the Club of Rome formulated it, the consensus was that global cooling (due to dust and pollution from natural volcanic eruptions and from industry) was screening out sunlight, and we were in for runaway glaciation and a new ice age.