Sentences with phrase «atmospheric levels over»

The chart on left plots the monthly HadCRUT anomalies and monthly atmospheric levels over the last 15 years (180 months).

Not exact matches

«Despite stronger solar wind and EUV - radiation levels under the early Sun, ion escape can not explain more than 0.006 bar of atmospheric pressure lost over the course of 3.9 billion years,» says Robin Ramstad.

Growth rates for concentrations of carbon dioxide have been faster in the past 10 years than over any 10 - year period since continuous atmospheric monitoring began in the 1950s, with concentrations now roughly 35 percent above preindustrial levels (which can be determined from air bubbles trapped in ice cores).

Meanwhile, atmospheric carbon dioxide levels continue to climb, up about 20 percent over the past half century.

Ocean acidification, which is a direct consequence of increased atmospheric carbon dioxide levels, is expected to have a deleterious effect on many marine species over the next century.

An international team examining the impact of ocean acidification on coral has found that a key reef - building coral can, over a relatively short period of time, acclimate to a doubling of atmospheric carbon dioxide levels.

Researchers at Princeton University analyzed ice cores collected in Greenland and Antarctica to determine levels of atmospheric oxygen over the last 800,000 years.

This draft can be quickly increased if a low level jet stream exists over or near the fire, or when an atmospheric temperature inversion cap is pierced by it.

As atmospheric carbon dioxide levels increase, it becomes easier for trees to gather carbon dioxide and gives them a growing advantage over grasses.

From in situ measurements made over a 20 - month period by the Tunable Laser Spectrometer (TLS) of the Sample Analysis at Mars (SAM) instrument suite on Curiosity at Gale Crater, we report detection of background levels of atmospheric methane of mean value 0.69 ± 0.25 ppbv at the 95 % confidence interval (CI).

The ice core data also shows that CO2 and methane levels have been remarkably stable in Antarctica — varying between 300 ppm and 180 ppm — over that entire period and that shifts in levels of these gases took at least 800 years, compared to the roughly 100 years in which humans have increased atmospheric CO2 levels to their present high.

From a quarter to half of Earth's vegetated lands has shown significant greening over the last 35 years largely due to rising levels of atmospheric carbon dioxide, according to a new study published in the journal Nature Climate Change on April 25.

Over the past 250 years, human activities such as fossil fuel burning have raised the atmospheric CO2 concentration by more than 40 % over its preindustrial level of 280 ppm (parts per milliOver the past 250 years, human activities such as fossil fuel burning have raised the atmospheric CO2 concentration by more than 40 % over its preindustrial level of 280 ppm (parts per milliover its preindustrial level of 280 ppm (parts per million).

For example, the model predicts that production of carbon dioxide must increase with time, a finding that goes against the conventional wisdom that carbon fluxes and atmospheric carbon dioxide levels have steadily decreased over the last 4 billion years.

By analyzing boron in shells accumulated over more than 2 million years, Hönisch was able to reconstruct in unprecedented detail how atmospheric carbon dioxide levels have changed over time.

Trace elements trapped in ancient plankton reveal that atmospheric carbon dioxide levels have been largely stable over the last 2.1 million years.

the Arctic has shown a pattern of strong low - level atmospheric warming over the Arctic Ocean in autumn because of heat loss from the ocean back to the atmosphere....

Predictions of the climate's development in response to elevated atmospheric CO2 levels started in earnest over 25 years ago.

Running simulations with an Earth System model, the researchers find that if atmospheric CO2 were still at pre-industrial levels, our current warm «interglacial» period would tip over into a new ice age in around 50,000 years» time.

Increased levels of atmospheric carbon dioxide could also significantly alter ocean temperatures and chemistry over the next century, which could lead to increased and more severe mass bleaching and other stressors on coral reefs.

Dublin's most legendary party venue and nightclub, Howl at the Moon on Lower Mount Street, is spread over four different levels from the underground atmospheric nightclub to the Velvet Lounge on the top floor.

Pixelfield features: — over 50 guns and over 200 skins for them — over 60 character skins (many of them can be exported to Minecraft)-- over 10 varied game maps — atmospheric sound effects and music — classical modes: Deathmatch, Team Deathmatch, Domination — unique cooperative mode: Boss Raid — unique team modes: Pigpocalypse, Storm — single - player mode: fight hordes of zombies or armed enemies — chests with unique weapon skins — ability to level up any guns — regional selection for comfortable online play -------------------------------------------------- NOT OFFICIAL MINECRAFT PRODUCT.

Yet over the period 2020 - 2100 RCP2.6 includes 290Gt (C) of net CO2 emissions, a quantity which would raise atmospheric CO2 levels by 62ppm if it had been released in recent decades, 53ppm above that expected for 2100.

Until atmospheric levels of CO2 move over perhaps a decade long, we cant be sure we are really reducing emissions.

The link between global temperature and rate of sea level change provides a brilliant opportunity for cross-validation of these two parameters over the last several millenia (one might add - in the relationship between atmospheric [CO2] and Earth temperature in the period before any significant human impact on [CO2]-RRB-.

We can estimate the atmospheric overturning from reanalyses which provide data on the flow over a range of vertical levels and on a global scale.

Transient climate sensitivity: The global mean surface - air temperature achieved when atmospheric CO2 concentrations achieve a doubling over pre-industrial CO2 levels increasing at the assumed rate of one percent per year, compounded.

Patterns of anomalously high sea levels are attributed to El Niño — related changes to atmospheric pressure over the Gulf of Mexico and eastern Canada and to the wind field over the Northeast U.S. continental shelf.

Phasing out these subsidies over the next decade would achieve more than 30 percent of the cuts in carbon emissions necessary to keep rising atmospheric temperatures at no more than 2 degrees Celsius above pre-industrial levels, the IEA says.

In 2004 Stephen Pacala and Robert Socolow published a paper in Science in which they argued that a pragmatic, but still difficult, way of stabilizing atmospheric CO2 levels over the long term was via the implementation of seven «stabilization wedges» over the next 50 years.

a) atmospheric CO2 from human activity is a major bause of observed warming in the 1980's and 1990's, c) that warming is overstated due to a number of factors including solar effects and measurement skew d) the data going back 150 years is of little reliability because it is clustered so heavily in northeast america and western europe rather than being global e) the global climate has been significantly shifting over the last thousand years, over the last ten thousand years, and over the last hundred thousand years; atmospheric CO2 levels did not drive those changes, and some of them were rapid.

All of this is reason for everyone and his brother, aunt and sister to greatly reduce their own GHG emissions, and to scream bloody murder till every corporation, institution and governmental body they have any influence over to immediately institute policies to rapidly bring down GHG emissions and look at reliable ways of drawing down atmospheric CO2 levels directly (especially replanting grasslands in the north, tree planting toward the equator where albedo change is not an issue).

This is about as far as one could get from high levels (relative to most atmospheric concentrations) of methane over large areas high in the atmosphere in the Arctic where there is very little (direct) human activity.

However, when heated to temperatures of over 705 °F and pressures of more than 3200 pounds per square inch (psi; atmospheric pressure is about 15 psi at sea level), water enters a unique, supercritical phase.

The study projects that a doubling of atmospheric carbon dioxide (CO2) concentrations over pre-industrial levels will increase global temperatures by between 1.2 °C and 2.9 °C, with 1.9 °C being the most likely outcome.

It is indeed true that at current atmospheric levels, CO2 would drop to 50 % of its current value over about 100 years (or perhaps less) if no more were added, so that recycling among the various components of the system were the only process ongoing.

Asked to rate each energy technology's potential to decrease atmospheric carbon levels over the next 25 years, the number of respondents seeing «high potential» for solar electric, for example, dropped to 66 percent from 74 percent.

During times of warmth, the ocean water levels rise as atmospheric moisture increases but at a rate decelerating when atmospheric temperatures over oceans approach say 33 C.

Moreover, concerns previously raised by the Arctic Methane Emergency Group (AMEG) over potential methane plumes in shallow Arctic waters have re-emerged, with occasional readings of massively elevated atmospheric methane levels — perhaps small harbingers of what some have called «dragons» breath».

And over that time period humans have emitted over 30 % of ALL the CO2 emissions they EVER emitted, and the atmospheric concentration has reached all - time record levels.

While the conditions in the geological past are useful indicators in suggesting climate and atmospheric conditions only vary within a a certain range (for example, that life has existed for over 3 billion years indicates that the oxygen level of the atmosphere has stayed between about 20 and 25 % throughout that time), I also think some skeptics are too quick to suggest the lack of correlation between temperature and CO2 during the last 550 million years falsifies the link between CO2 and warming (too many differences in conditions to allow any such a conclusion to be drawn — for example the Ordovician with high CO2 and an ice age didn't have any terrestrial life).

The first is climate inertia — on very many levels, from fossil lock - in emissions (decades), ocean - atmospheric temperature inertia (yet more decades), Earth system temperature inertia (centuries to millennia) to ecological climate impact inertia (impacts becoming worse over time under a constant stress)-- all this to illustrate anthropogenic climate change, although already manifesting itself, is still very much an escalating problem for the future.

Given evolution over the past 500 million years when virtually all modern emerged and radiated largely occurred while the planet had no polar ice caps and atmospheric CO2 up to ten times current level, and the planet was green from pole to pole, and life did so well it was able to sequester huge amounts of energy in fossil fuel beds.

Volcanic activity proceeds over the decades at a level of only about 1 percent of industrial CO2 emissions, and even major eruptions observed during the past century have changed atmospheric CO2 trends only minimally and transiently.

This test was not only about CO2 over sixty times the current atmospheric concentration, but also cold and low O2 and other factors, so it's of limited use, one hopes, in a discussion of expected atmospheric levels of CO2.

Over the last 30 years, atmospheric levels of carbon dioxide increased by about 15 percent, from about 328 parts per million to about 372 parts per million.

So far, the Antarctic Vostok and EPICA Dome C ice cores have provided a composite record of atmospheric carbon dioxide levels over the past 650,000 years1, 2,3,4.

As can be seen in the NOAA Earth System Research Laboratory animation of carbon dioxide levels for the past 800,000 years below, atmospheric carbon dioxide levels are currently well above where they have been over the 800,000 years, according to the geological record.

The dilemma is this: the rate of increase of atmospheric CO2 has leveled off at around 0.5 % per year, over a time period when human population was growing at 1.7 % per year.

Over the last 250 years, atmospheric CO2 levels have increased by OVER 110 parts per milliOver the last 250 years, atmospheric CO2 levels have increased by OVER 110 parts per milliOVER 110 parts per million..