Sentences with phrase «warm period when»

Things were good during the warmth of the Holocene Optimum when Mesopotamia flourished, they were good during the Medieval Warm Period when Vikings inhabited Greenland, and things have never been better than they are today, even though today is warmer than the norm.

One of those is medieval warm period when much of Greenland was ice - free and the Vikings settled there and established successful farms.

No one knows for sure how much Earth would have to warm before it reaches the tipping point — though about a thousand years ago, there was a time known as the Medieval Warm Period when much of Earth appears to have been unusually warm.

This included a Medieval warm period when the Vikings farmed Greenland and a «little ice age» more recently when the Thames River often froze solid.

In a paper published in Geophysical Research Letters, researchers found that interactions between methane, carbon dioxide and hydrogen in the early Martian atmosphere may have created warm periods when the planet could support liquid water on the surface.

That is the combined total length of the no - warming period when the eighties and the nineties are added.

The above paper refers to the late 20th century warming period when the stratosphere was cooling and ozone was falling.

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.

Not exact matches

This warm period was followed by the «little ice age» when the Thames would frequently freeze over during the winter.

I believe we have been incredibly lucky to have lived duringa period of modest warming, but it may be coming to an end.Mankind has always prospered when the world was warmer, perfectexamples being the Roman and Medieval periods.

Mathieu Flamini vs David Silva The Frenchman hasn't been at his very best in recent times when he has had to warm the benches for long periods and, as and when Arteta breaks down now and then, always finds himself in a catch - 22 scenario of whether he wants to play for his spot in the side or deputize for Arteta efficiently.

Many women who are initially opposed to the idea warm up to it as they are going through menopause and find that life doesn't have to end when their periods do.

However, if and when meals that are brought in for heat up and remain in a warming oven for a long period of time both the quality and nutritional value can decline.

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.

«Scale insects were most likely to be present on specimens collected during warm historical time periods, and scales were most abundant when temperatures were similar to modern, urban Raleigh.»

The additional warming caused a near - doubling of melt rates in the twenty - year period from 1995 to 2015 compared to previous times when the same blocking and ocean conditions were present.

They'd seen slowdowns in the past, often associated with natural cycles in the Earth's climate — England pointed to periods when the Earth has taken a break from warming, such as from 1945 to the late 1970s.

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.

Scientists from Rice University and Texas A&M University - Corpus Christi's Harte Research Institute for Gulf of Mexico Studies have discovered that Earth's sea level did not rise steadily but rather in sharp, punctuated bursts when the planet's glaciers melted during the period of global warming at the close of the last ice age.

In periods when the ocean surface warms (associated with red), the prevailing winds are more prone to sweep down from the north.

They suggested this based on paleoclimate data from the Eemian period, when one degree of warming seems to have done just that.

Scientists define them as periods when the sea surface in a given area of the ocean gets unusually warm for at least five days in a row.

The period when the insect lived, the Eocene, was one of the warmest in history, and lush tropical or subtropical rain forest surrounded the lake; the two - and - a-half-inch-long adult male most likely sat and snacked upon the leaves of plants from the laurel or the pea family.

«In winters when it's quite cold but there are warm periods, the plants lose the blanket of snow that covers them,» Doak explains.

I had read about the «courting period,» so I was prepared when the warm and friendly atmosphere cooled a bit and the rosy prospects tarnished slightly.

What happens when the world moves into a warm, interglacial period isn't certain, but in 2009, a paper published in Science by researchers found that upwelling in the Southern Ocean increased as the last ice age waned, correlated to a rapid rise in atmospheric carbon dioxide.

When waters warm for an extended period, they essentially cook the algae that help coral grow.

The giant lycopsids died out at the end of the Carboniferous period when global warming dried up the swamps.

Under the model they developed, the scientists say the likelihood of Bd occurrence is predicted to decrease during warmer periods, and when precipitation exceeds an annual rainfall threshold above 1,800 mm per year.

The core reaches only as far back as the latter part of the Pleistocene epoch, when Earth began cycling between warm and cold periods every 100,000 years.

When he lined up their ages with global climate records, he noticed a pattern: Many species of megafauna seemed to disappear during a period of extreme warming around 12,300 years ago, Cooper and his team write today in Science Advances.

The sediment cores used in this study cover a period when the planet went through many climate cycles driven by variations in Earth's orbit, from extreme glacial periods such as the Last Glacial Maximum about 20,000 years ago, when massive ice sheets covered the northern parts of Europe and North America, to relatively warm interglacial periods with climates more like today's.

When the ground is frozen above a cave no water seeps into it, making such formations «relicts from warmer periods before permafrost formed,» the researchers wrote in a study published online in Science on 21 February.

«It's a period when Mars was probably transforming from a wet, warm place — perhaps a harbor for life — to what we see now: a dry, cold, inhospitable environment, not good for life,» Agee says.

«We have found plumes that exist only in warmer periods, when methane is released along with water,» says physicist Robert Novak of Iona College in New Rochelle, New York.

These remains confirm that the deposits date to a warm period of climate around 420,000 years ago, the so - called Hoxnian interglacial, when the climate was probably slightly warmer than the present day.

This travel corridor allowed mammals to come to Alaska when their favored foods — grasses, sedges, and rushes — thrived during warm periods.

There was an era called white earth which starts about 700 million years ago with alternating periods of deep ice sheets and then hotter warmer stages which led to formation of various kinds of crystals, and last and luckily we live in the period known as green earth, which started about 400 million years ago when multicellular life arose and wholly changed to biochemical breakdown the makeup of the minerals on the planet again.

The strait also allowed mammals to leave Alaska for greener pastures when prolonged periods of warmer, wetter climate allowed peat to spread, which cooled the ground and discouraged the grass, sedges and rushes from growing.

However, Goddard said the results don't fully show the slowdown has disappeared when comparing the past 15 years to the decades preceding that period and that understanding the natural fluctuations in climate on a year - to - year (or even decade - to - decade) basis provides important context to the warming trends driven by carbon dioxide.

In the current analysis, Bohr wanted to find out if people's particular political orientations and beliefs about global warming changed at all during periods of so - called temperature anomalies, when temperatures above or beyond the normal are experienced.

In green turtles, the lines seem to reflect periods when seas are colder and body temperatures are consequently lower, prompting the turtles to haul out on beaches to warm in the sun.

The decoupling corresponds to periods when the Gulf Stream, a powerful marine current that carries the warm waters of the Gulf of Mexico northwards, was pushed towards the Bay of Biscay by the moderate iceberg break - up from the North of the American continent.

When temperatures were very cold on the mainland, the oceans remained warm, especially during the periods of intense cooling that took place at the onset of glaciation.

But an ice core collected in nearby Greenland suggests that the planet experienced continuous cold from 40,000 to about 115,000 years ago, when the last warm interglacial period ended, Miller said.

If this rapid warming continues, it could mean the end of the so - called slowdown — the period over the past decade or so when global surface temperatures increased less rapidly than before.

When the equatorial central and eastern Pacific is in a decadal warm period, summer monsoon rainfall is stronger in the Yangtze River valley but weaker in North China.

at NCDC) when extended 1,000 years out = 20 Deg C, which would be around 4 times the rate of warming which took place during the especially intense period of rapid global warming for the first 1,000 years of the PETM.

Today, researchers use the term El Niño only for those periods when the surface water around the equator in the eastern and central Pacific warms for an extended period of time.

If you look at the proxy portion of the new Moberg graphic, you see nothing that would be problematic for opponents of the hockey stick: it shows a striking Medieval Warm Period (MWP), a cold Little Ice Age and 20th century warming not quite reaching MWP levels by 1979, when the proxy portion of the study ends.