Sentences with phrase «recent glacial»

The most recent glacial period peaked 21,500 years ago during the Last Glacial Maximum, or LGM.

Since then, atmospheric CO2 declined as the Indian and Atlantic Oceans have been major depocentres for carbonate and organic sediments while subduction of carbonate - rich crust has been limited mainly to small regions near Indonesia and Central America [10], thus allowing CO2 to decline to levels as low as 170 ppm during recent glacial periods [11].

Establishing the role of carbon dioxide (CO2), both as a feedback and forcing, during the most recent glacial and deglacial periods provides an excellent opportunity for understanding how this connection operates.

As the worlds» oldest and most scrutinised instrumental temperature record it usefully covers much of the «Little Ice Age» when the most extensive recent glacial advances in the Holocene began, whilst numerous contemporary records make it possible to examine earlier periods in British climatic history.

Similarly, in a study of air temperature and CO2 data obtained from Dome Concordia, Antarctica for the period 22,000 - 9,000 BP — which time interval includes the most recent glacial - to - interglacial transition — Monnin et al. (2001) found that the start of the CO2 increase lagged the start of the temperature increase by 800 years.

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 ages.

-- Gleick It's my understanding that the White Earth is colder than the recent glacial periods.

For my part, I have studied the oceanographic and biological consequences of abrupt climate warming in the very recent glacial and interglacial climates of the Late Pleistocene (from 20,000 years ago to the present).

To assert that the recent glacial melting is somehow part of a linear decline that began 10000 years ago is an absurd claim that can easily be refuted by looking at measures of sea level over the past 10000 years.

I'm also intrigued by Raymo's idea that an important factor is that during recent glacial cycles, the ablation zone of N.Hem ice sheets is land - based but that of S.Hem ice is ocean - based.

Due largely to the discovery of stalactites in the underwater caves found in the Belize Barrier Reef, geologists have discovered that the Belize Barrier Reef was not created by volcanic activity (as many reefs are) but instead by the most recent glacial period instead.

Starting at our Wisconsin location, we went to some of the «driftless» area - where there wasn't recent glacial activity.

For the most recent glacial periods ice cores provide climate proxies from their ice, and atmospheric samples from included bubbles of air.

This is because terrestrial deposits of ancient glacial and interglacial periods1 — 3 are overrun and eroded by more recent glacial advances, and are therefore usually rare, isolated and poorly dated.

Recent glacial history and rapid ice stream retreat in the Amundsen Sea.

The most recent glacial period, for example, occurred from roughly 90,000 years ago until 15,000 years ago, and Homo sapiens who had mastered the widespread use of fire were around for the entire duration.

Cave Bears (Ursus spelaeus) lived in Europe during the most recent glacial period, approximately 400,000 years ago, until they became extinct about 25,000 years ago.

Not exact matches

Substantial reductions in the extent of Arctic sea ice since 1978 (2.7 ± 0.6 percent per decade in the annual average, 7.4 ± 2.4 percent per decade for summer), increases in permafrost temperatures and reductions in glacial extent globally and in Greenland and Antarctic ice sheets have also been observed in recent decades.

These may be submerged ancient shorelines cut during times of lower sea level, «the most recent of which occurred during the last glacial period, which ended about 19,000 years ago,» Chaytor said.

But recent surveys indicate there are hardly any stable ridgelines left to stop the glacial retreat.

A prehistoric human skeleton found on the Yucatán Peninsula is at least 13,000 years old and most likely dates from a glacial period at the end of the most recent ice age, the late Pleistocene.

Drawing on recent findings from archaeology, genetics, and the environmental sciences, the author provides a region - by - region account of the transformations of human populations in the 15 millennia following the Last Glacial Maximum.

The results of our recent study suggest that the Atlantic water never ceased to flow into the Nordic Seas during the glacial period,» says Mohamed Ezat, PhD at Centre for Arctic Gas Hydrate, Environment and Climate (CAGE) at UiT, The Arctic University of Norway.

The first one (around 50,000 — 200,000 years ago) colonised the Eastern Mediterranean, and in the second, much more recent (after the last glacial period), the species colonised Southern Italy, particularly Calabria.

«I liked how they combined traditional oceanographic measurements like chlorophyll levels and primary production, and recent satellite work by other groups that looked at glacial melt,» said Scott Doney, a scientist at the Woods Hole Oceanographic Institution.

If for example the recent increase in speed of glacial melting is not noise but a real trend, icecap melting tends to provide faster feedback than other forcings thus will give worse results.

Recent research shows that there is high microbial activity on glacial surfaces (Anesio et al., 2009), some associated with pigmented algae, which absorb significantly more light than local inorganic dust particles on the Greenland Ice Sheet (GrIS)(Lutz et al., 2014).

«The recent research findings show that during the last Ice Age, mammoths were the most widely distributed large mammals, thus rightfully serving as a flagship species of the glacial era,» according to Prof. Dr. Ralf - Dietrich Kahlke, an Ice Age researcher at the Senckenberg Research Station for Quaternary Paleontology in Weimar.

Nature has tagged a recent paper on the importance of glacial melt to water supply in Asia with an expression of concern (EoC), after receiving a tip that the author had misused some data.

We also know humans were pretty much only in Africa for most of the glacial cycles and was highly mobile during the most recent.

For instance, Köhler et al used an estimate of the cooling at the Last Glacial Maximum of 5.8 ± 1.4 ºC, but a recent update from Annan and Hargreaves and used in the Hargreaves et al estimate is 4.0 ± 0.8 ºC which would translate into a lower CS value in the Köhler et al calculation (roughly 1.1 — 3.3 ºC, with a most likely value near 2.0 ºC).

PROVIDENCE, R.I. [Brown University]-- The slopes of a giant Martian volcano, once covered in glacial ice, may have been home to one of the most recent habitable environments yet found on the Red Planet, according to new research led by Brown University geologists.

But remember, many institutions (like pension funds) can respond with glacial speed to events / trends of recent years, and to Europe's shaky near / medium term prospects.

This danger was exposed in Brown's recent concert at the Brooklyn Academy of Music [Oct. 16, 17 and 18, «81], where the black - and - white restraint of Glacial Decoy was immediately followed by the coloristic exuberance of Brown's most recent work, Son of Gone Fishin», with a set by Donald Judd, costumes by Judith Shea and, in what is perhaps the most significant departure from Brown's previous practice, a musical score by Robert Ashley.

For example, the young geologist student can study the recent effects on the landscape of rapidly retreating glacial ice.

Maybe you would find our recent manuscript interesting, in which we use an efficiently - generated ensemble of a state - of - the - art GCM, tuned to present - day climate and validated (tested against out - of - sample data) with simulations of the Last Glacial Maximum.

For instance, Köhler et al used an estimate of the cooling at the Last Glacial Maximum of 5.8 ± 1.4 ºC, but a recent update from Annan and Hargreaves and used in the Hargreaves et al estimate is 4.0 ± 0.8 ºC which would translate into a lower CS value in the Köhler et al calculation (roughly 1.1 — 3.3 ºC, with a most likely value near 2.0 ºC).

The Last Glacial Maximum (i.e. the most recent «ice age», abbreviated LGM) probably provides the best opportunity for using the past to constrain climate sensitivity.

3) Lack of evidence that the changes being seen are not long - standing, being largely due to the inundation of the ESAS after the end of the last glacial rather than due to recent anthropogenic warming.

Every single recent, Holocene, or Glacial - era temperature hindcast is likewise non-unique.

For example, atmospheric carbon dioxide grew by approximately 30 % during the transition from the most recent cold glacial period, about 20,000 years ago, to the current warm interglacial period; the corresponding rate of decrease in surface ocean pH, driven by geological processes, was approximately 50 times slower than the current rate driven largely by fossil fuel burning.

«In reality climate models have been tested on multicentennial time scales against paleoclimate data (see the most recent PMIP intercomparisons) and do reasonably well at simulating small Holocene climate variations, and even glacial - interglacial transitions.

However, there's less match between the amplitude changes in the most recent million years or so, yet another indicator that the response of glacial changes to astronomical cycles is itself changing over time.

The earth has been speeding up in recent years due to Glacial Isostatic Adjustment from a combination of the Last Glacial Maximum and the Little Ice Age.

In addition to the increasing trend of recent CO2 content in atmosphere, according to my interpretations, empiric observations prove that the trends of CO2 content in atmosphere have followed temperature during the last century, during the glacial and interglacial eras, and during the last 100 million years.

«The question is again being discussed whether recent and long - continued observations do not point to the advent of a second glacial period, when the countries now basking in the fostering warmth of a tropical sun will ultimately give way to the perennial frost and snow of the polar regions.»

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.

Current Science: Recent climate changes have had significant impact on high - mountain glacial environment.

The climatic glacial mode may develop rapidly, but there is a lag of the order of 10,000 years in the subsequent buildup of a continental ice sheet... The recent climatic fluctuations in the area are on too short a timescale to be viewed with alarm.

«This is an important result since there has been debate about the causes of recent tropical glacial recession — for example, whether it is due to temperature, precipitation, humidity, solar irradiance or other factors,» said Dr. Kelly in the press release