Sentences with phrase «between periods of warm»

Ice ages alternate between periods of warm and cold.

It seems that temperatures in the Arctic naturally alternate between periods of warming and periods of cooling.

Whatever the case, it is clear that the Arctic seems to alternate between periods of warming and periods of cooling.

Not exact matches

The time between hearing «Honey, I'm pregnant» and «Oh my God, I think I felt a contraction,» is a warm - up period for the rest of your life.

For the last 2.5 million years, Earth settled into a rather unusual period of potential instability as we rocked back and forth between ice ages and intervening warm periods, or interglacials.

Scientists may also become able to distinguish between different scenarios sooner by studying the physics of local ice - sheet changes and refining reconstructions of changes during warm periods in geological history.

«Using a numerical climate model we found that sulfate reductions over Europe between 1980 and 2005 could explain a significant fraction of the amplified warming in the Arctic region during that period due to changes in long - range transport, atmospheric winds and ocean currents.

It is also the longest period of globally stable climate and sea level in at least the last 400,000 most recent years of seesaw between glaciation and warmer times.

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

The more intensive variations during glacial periods are due to the greater difference in temperature between the ice - covered polar regions and the Tropics, which produced a more dynamic exchange of warm and cold air masses.

Understanding the complex interplay between climate and biotic interactions is thus essential for fully anticipating how ecosystems will respond to the fast rates of current warming, which are unprecedented since the end of the last glacial period.

For example, the ice ages during the last several million years — and the warmer periods in between — appear to have been triggered by no more than a different seasonal and latitudinal distribution of the solar energy absorbed by the Earth, not by a change in output from the sun.

Statistical analysis of average global temperatures between 1998 and 2013 shows that the slowdown in global warming during this period is consistent with natural variations in temperature, according to research by McGill University physics professor Shaun Lovejoy.

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.

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).

Scientists monitoring the Cayman reefs noted a 40 percent decline in live coral cover between 1999 and 2004 during a period of warmer seas in the Caribbean.

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.

«Looking at weather and dengue incidents over longer periods, we found a similar strong link between how increased rainfall and warmer temperatures resulting from the reoccurring el Niño phenomenon are associated with elevated risks of dengue epidemics.

To explore the links between climatic warming and rainfall in drylands, scientists from the Universities of Cardiff and Bristol analysed more than 50 years of detailed rainfall data (measured every minute) from a semi-arid drainage basin in south east Arizona exhibiting an upward trend in temperatures during that period.

«We could see that the concentration of carbon dioxide and solar radiation was higher during the cold period between the two warm periods compared with the cold period before the first warming 15,000 years ago.

Earth's climate naturally varies between times of warming and periods of extreme cooling (ice ages) over thousands of years.

«It confirms that the during the Medieval Warm Period between 1080 and 1430 the oscillation index was in an unusually prolonged positive phase, which brings increased rain to Scotland and drier conditions in the western Mediterranean,» says Baker, of the UNSW Connected Waters Initiative Research Centre.

By studying the relationship between CO2 levels and climate change during a warmer period in Earth's history, the scientists have been able to estimate how the climate will respond to increasing levels of carbon dioxide, a parameter known as «climate sensitivity».

The new analysis suggests no discernable decrease in the rate of warming between the second half of the 20th century, a period marked by manmade warming, and the first fifteen years of the 21st century, a period dubbed a global warming

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 is a disparity between warm High Arctic upper air proven by a great melt of 2008 during mostly cloudy period, something you easily forget, the convenience of grasping at straws, and a continuance of reports showing a cool troposphere.

These so - called «modest hyperthermals» (meaning a rapid, pronounced period of global warming) had shorter durations and recoveries (about a 40,000 year cycle) and involved an exchange of carbon between surface reservoirs into the atmosphere and then into sediment.

And through detailed studies of the local physics of ice - sheet changes and more refined reconstructions of ice - sheet changes during warm periods of the geological past, scientists may become able to distinguish between the two roads sooner.

The whole of the last several million years has been a classic two state climate, oscillating between ice ages and warm periods, with sudden changes between the two.

So what is the time difference between CO2 levels during the onset of a cooling period at the end of a warming period and the time history of the temperature changes in the ice cores?

In geological time, the balance of the system has changed several times, and just like any system can have a resonance at certain points, the climate can reach a resonant point where it is teetering between two states (our current 100,000 year ice age warm period cycle).

Inter-cutting between the two time periods means that we get an even mixture of the curious and warm younger Darwin with the tired and distant older Darwin.

During the last part of the Pleistocene there were actually five major periods of glaciation with four periods of warmer non glacial conditions between them.

On your first comment, part of the discrepancy between our model's warming and the IPCC result is due to different reference periods.

Further, since you agree with us that the warming rate during the next several decades will be below 0.325 ºC / decade, then, as I have pointed out, due to the level of natural variability, a 20 - yr time period is too short to really differentiate between your beliefs and ours (if there exist any).

These results suggest that sea surface temperature pattern - induced low cloud anomalies could have contributed to the period of reduced warming between 1998 and 2013, and offer a physical explanation of why climate sensitivities estimated from recently observed trends are probably biased low 4.

During some of the warm periods between past ice ages, it has been as warm as, or warmer than, it is today.

However, as I understand it what is currently the mainstream view is that what explains the transition from early 20th century warming to the flat period between is the resumption of industrial production and thus of reflective aerosols (predominantly sulfates), and that likewise, it was the passage in the early seventies of laws requiring cleaner emissions that reduced reflective aerosols.

This is the linchpin: if the difference between pre-industrial and modern temperatures is not as dramatic as this analysis indicates — i.e. if modern GLOBAL temperatures are comparable to those of the Medieval Warm Period (named for a REGIONAL phenomenon)-- then there is little need for urgency.

The research, led by Chronis Tzedakis of University College, London, examined similarities between the current warm interval between ice ages and a particular point, around 780,000 years ago, during a past warm period known as Marine Isotope Stage 19.

So now I answer the «ice - age» denialist argument (denialists usually trot out ALL their inconsistent & contradictory arguments) this way: I draw a sine - wave in the air with my hand, saying, yes, that the normal fluctuation over a long geological timeframe is to alternate between cold ice ages and warm interglacial periods, and that now we are right here in a warm interglacial period (my hand raised at the top of the wave), and if there were no human GHGs, then we would expect that over a long time frame we'd be sliding down into an ice age.

Skeptics of the current global warming now refer to the period between 1998 and 2008 and claim that global warming has ended.

During a period in which surface warming is stifled by internal variability the rate of energy accumulation would be influenced only by the forcing — there would be no difference between a high - sensitivity model and a zero - feedback model (assuming zero - dimensional models; the reality, with regionally varying temperatures and feedbacks, would be more complex).

To achieve such a cycle, BNO (S) must at a minimum warm the surface and atmosphere of the planet by a total of 0.31 °C during 1970 - 99 which would require more than perhaps 20 ZJ during the warming phase, equally divided between the first half and the last half of this 1970 - 99 period.

So what is the time difference between CO2 levels during the onset of a cooling period at the end of a warming period and the time history of the temperature changes in the ice cores?

But the time period for your graph includes the 1940 to 1970 period of slight cooling between warming episodes before and after it.

In geological time, the balance of the system has changed several times, and just like any system can have a resonance at certain points, the climate can reach a resonant point where it is teetering between two states (our current 100,000 year ice age warm period cycle).

The whole of the last several million years has been a classic two state climate, oscillating between ice ages and warm periods, with sudden changes between the two.

Second, the rate of warming between 1880 and 1940 was not as severe as it has been since 1980, and morever, biomes across the planet have been radically altered by human activities muc more during the latter period (e.g. especially since 1950).

These assumed that the largest decreases in rainfall would be in winter and spring (decreases of 5 % and 11 % between 1990 and 2030 on the low and high global warming scenarios respectively), but rainfall was fractionally HIGHER in winter / spring in the more recent period (1995 - 2006) than in the previous 11 - year period.