Sentences with phrase «warmer periods occurred»

So far, ice cores from Greenland and marine sediment cores from Antarctica show that a notable warming period occurred from 3,000 to 8,000 years ago.

The warmest period occurred in the late 20th century — too short to meet Soon and Baliunas's selected requirement.

As he points out, comparable warming periods occurred many times over the previous 2 million years, yet body and brain size regularly increased.

The Medieval Warm Period occurred 1,000 years ago, when wine vineyards dotted the landscape in Great Britain and Vikings grew corn and barley in Greenland.

It has now become clear to scientists that the Medieval Warm Period occurred during a time which had higher than average solar radiation and less volcanic activity (both resulting in warming).

In South America and Australasia, a sustained warm period occurred later, from around AD 1160 to 1370.»

«humans have emerged as the dominant agent of future change» so that is why the Roman and Minoan warming periods occurred.

In South America and Australasia, a sustained warm period occurred later, from around ad 1160 to 1370.

These warm periods occur roughly every 900 years so the present one is right on queue.

The warmest period occurred in the late 20th century — too short to meet Soon and Baliunas's selected requirement.

The first warming period occurred between 1900 and 1945.

Not exact matches

Notably, the rise and expansion of both the Indus Valley civilization (from about 5350 years to about 4600 years ago) and the Vedic civilization (from about 3450 years to about 3100 years ago) occurred during periods when climate was relatively warm, wet, and stable.

But they've been especially interested in the most recent period of abrupt global warming, the Bølling - Allerød, which occurred about 14,500 years ago when average temperatures in Greenland rose about 15 degrees Celsius in about 3,000 years.

Instead, the fossil record indicates they vanished during the Earth's glacial - interglacial transition, which occurred about 12,000 years ago and led to much warmer conditions and the start of the current Holocene period.

In the Ozarks, glades often help to preserve isolated communities of cacti and other desert and prairie species that dominated the area during the Hypsithermal, a period of warming that occurred four to eight thousand years ago.

The warming at Mt. Hunter is about double the amount of warming that has occurred during the summer at areas at sea level in Alaska over the same time period, according to the new research.

One period of particular interest is a warm, wet interglacial stage known as the Eemian that occurred from 124,000 to 119,000 years ago, featuring average global temperatures about 2 °C warmer than today.

The Holocene Climate Optimum was a period of global climate warming that occurred between six to nine thousand years ago.

The surge in melt events corresponds to a summer temperature increase of at least 1.2 - 2 degrees Celsius (2.2 - 3.6 degrees Fahrenheit) relative to the warmest periods of the 18th and 19th centuries, with nearly all of the increase occurring in the last 100 years.

Previous estimates suggested that peak temperatures during the warmest interglacial periods — which occurred at around 125,000, 240,000 and 340,000 years ago — were about three degrees higher than they are today.

Near - global satellite aerosol data imply a negative radiative forcing due to stratospheric aerosol changes over this period of about — 0.1 W / m2, reducing the recent global warming that would otherwise have occurred.

Wet and warm summers occurred during periods of Roman and medieval prosperity.

But they looked for 50 - year - long anomalies; the last century's warming, the IPCC concludes, occurred in two periods of about 30 years each (with cooling in between).

They said that two extreme climate periods — the Medieval Warming Period between 800 and 1300 and the Little Ice Age of 1300 to 1900 — occurred worldwide, at a time before industrial emissions of greenhouse gases became abundant.

Moreover, their results were nonsynchronous: «Their analysis doesn't consider whether the warm / cold periods occurred at the same time,» says Peter Stott, a climate scientist at the U.K.'s Hadley Center for Climate Prediction and Research in Bracknell.

That may not have occurred during the warm period 400,000 years ago, known as Marine Isotope Stage 11 to scientists, which featured elements such as boreal forest on Greenland and higher sea levels.

The research, published in Nature Communications, examined preserved fossil remains of coccolithophores from a period of climate warming and ocean acidification that occurred around 56 million years ago — the Paleocene Eocene Thermal Maximum (PETM)-- and provides a much - needed long - term perspective of coccolithophore response to ocean acidification.

They occurred as the planet cycled through cold and warm periods linked to changes in its orbit around the sun.

This may have occurred because the continents were clustered around the equator, and so a warm Earth would be much more vulnerable to slight cooling trends that trigger a Snowball period.

Much of this change has occurred over the last several decades indicating that the warming trend accelerated over the 1925 — 2016 period.

Studies such as Otto et al. (2012) display how the numerical scale of the simulation numbers allows for clear separation between a climate with lower level of heat - trapping gases (1960s) and the recent period (2000s), such that the 2010 heat wave in western Russia was more likely to occur with the additional warming due to climate change (Figure 3).

there were «naturally occurring» warm periods in the past (eg.

The study noted that the same climate models the UN IPCC uses can only «explain only about half of the heating that occurred during a well - documented period of rapid global warming in Earth's ancient past.»

«The study found that climate models explain only about half of the heating that occurred during a well - documented period of rapid global warming in Earth's ancient past.

therefore, we are in «naturally occurring» warm period

Scientists have unearthed a new bird species from fossils in the Canadian Arctic dating back about 90 million years, making them the oldest records of avian species found so far north and suggesting an intense warming event occurred during the late Cretaceous period.

Carozza et al (2011) find that natural global warming occurred in 2 stages: First, global warming of 3 ° to 9 ° C accompanied by a large bolus of organic carbon released to the atmosphere through the burning of terrestrial biomass (Kurtz et al, 2003) over approximately a 50 - year period; second, a catastrophic release of methane hydrate from sediment, followed by the oxidation of a part of this methane gas in the water column and the escape of the remaining CH4 to the atmosphere over a 50 - year period.

Fortunately it normally occurs in very low concentration in the atmosphere — about 0.3 to 0.4 ppm during glacial periods and 0.6 to 0.7 ppm during warmer periods.

Globally, extremely warm nights that used to come once in 20 years now occur every 10 years.12 And extremely hot summers, those more than three standard deviations above the historic average, are now observed in about 10 % of the global land area, compared to 0.1 - 0.2 % for the period 1951 - 1980.13

These episodes occurred toward the end of a period of hundreds of millions of years during which warm water interacted with subsurface rocks.

Notably, both the decline in sea level and the decline in temperature occurred during the so - called European «Medieval Warm Period,» providing additional evidence that the «Medieval Warm Period» and «Little Ice Age» were not globally synchronous phenomena.

He said that using an earlier baseline period would have better captured all the warming that has occurred, as there was some small amount already in the late 19th century.

These local warm periods were very likely not globally synchronous and occurred at times when there is evidence that some areas of the tropical oceans were cooler than today (Figure 6.9)(Lorenz et al., 2006).

Ice ages have occurred in a hundred thousand year cycle for the last 700 thousand years, and there have been previous periods that appear to have been warmer than the present despite CO2 levels being lower than they are now.

The Little Ice Age (LIA) was a period of cooling that occurred after the Medieval Warm Pperiod of cooling that occurred after the Medieval Warm PeriodPeriod.

As snow accumulates, each The Little Ice Age (LIA) was a period of cooling that occurred after the Medieval Warm Pperiod of cooling that occurred after the Medieval Warm PeriodPeriod.

With warmer weather occurring over a longer period of time, there is more opportunity for these diseases to spread.

Muhs shared evidence from the Channel Islands about the last period of global warming that occurred about 125,000 years ago.

The planet may have been warmer recently, but the rate of increase, particularly over the last 10 - 20 years) has occurred so rapidly over such a short time period — this is what is not normal.

«temperatures during the warmest intervals of the Medieval Warm Period,» which they defined as occurring «some 900 to 1300 years ago, «were as warm as or slightly warmer than present day Greenland temperatures&raWarm Period,» which they defined as occurring «some 900 to 1300 years ago, «were as warm as or slightly warmer than present day Greenland temperatures&rawarm as or slightly warmer than present day Greenland temperatures»