Sentences with phrase «in atmospheric levels»

These shorter - term variations are mostly due to natural causes, and do not contradict our fundamental understanding that the long - term warming trend is primarily due to human - induced changes in the atmospheric levels of CO2 and other greenhouse gases.

Great mass extinction of species during geological history (late Devonian, Permian - Triassic, end - Triassic, Cretaceous - Tertiary, Paleocene - Eocene) have been triggered by volcanic, asteroid impact and greenhouse events associated with sharp increases in atmospheric levels of CO2 and CH4.

Only over climate timescales (typically, 30 years or more), do the long - term trends emerge that reflect the influence of changes in atmospheric levels of carbon dioxide.»

At the heart of both studies is a deeper concern about the response of the natural world to human - induced change, in the destruction of habitat, the loss of the plants, birds, insects, mammals, amphibians and reptiles that depend on habitat, and in the steady increase in atmospheric levels of greenhouse gases, as a consequence of profligate combustion of fossil fuels.

Indeed, the map at which JAXA spokesman Sasano was pointing (see photo above) had been expected by most experts to show that western nations are to blame for substantial increases in atmospheric levels of carbon dioxide, causing global warming.

As a result, global warming will continue to affect life on Earth for hundreds of years, even if greenhouse gas emissions are reduced and the increase in atmospheric levels halted.

But the burning of oil, coal, and gas also caused most of the historical increase in atmospheric levels of heat - trapping greenhouse gases.

Not exact matches

Is there a correlation, then, between levels of carbon dioxide in the atmosphere and atmospheric temperatures?

Aspirated by an oil - free air compressor, this extremely low level of atmospheric oil is washed away by the condensate in the intercooler and aftercooler.

Then, the effect may have snowballed, with the levels of both selenium in seawater and atmospheric oxygen crashing.

Each extinction was in some way associated with drastic changes in the planet's atmospheric CO2 levels.

GREENHOUSE GASSED In a long - running field experiment in Minnesota, scientists are studying the effects of rising atmospheric carbon dioxide levels on plots of grasslanIn a long - running field experiment in Minnesota, scientists are studying the effects of rising atmospheric carbon dioxide levels on plots of grasslanin Minnesota, scientists are studying the effects of rising atmospheric carbon dioxide levels on plots of grassland.

At a Feb. 7 hearing of Juliana, et al v. United States of America, et al — a case a group of kids, young adults and environmentalists brought in 2015 against the U.S. government — Frank Volpe said he didn't know whether carbon dioxide levels had reached 400 parts per million, a measurement of atmospheric concentration.

Enhanced levels of atmospheric carbon dioxide are a likely key driver of global dryland greening, according to a paper published in the journal Scientific Reports.

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).

In our industrial world, rapidly increasing atmospheric CO2 has surpassed 400 ppm, levels not achieved since the Pliocene era about 3 million years ago, while global temperature has increased nearly 1 °C since the 1870s.

Before oceanic oxygen levels tumbled, something caused a big change in atmospheric sulphate levels.

We have done that in spades by burning fossil fuels, raising atmospheric levels from a pre-industrial 280 parts per million to the current 387 ppm.

The findings could help predict how ocean circulation will affect atmospheric CO2 levels in future, says Will Howard of the University of Tasmania, Australia.

The indirect effects of rising atmospheric carbon dioxide (CO2) levels, such as changes in soil moisture and plant structure, can have a bigger impact on ecosystems than previously thought.

But advances in the understanding of atmospheric oxygen levels are challenging that idea, explains Sandra Schachat, a paleoentomologist at Stanford University, who led a recent study that modeled the gas's availability during the hexapod gap.

An observed long - term increase in the number of these clouds may be due in part to the rise in atmospheric carbon dioxide levels, he says.

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

For this reason, he and his colleague predict the Moon condensed in a pressure of more than 10 bar, or roughly 10 times the sea level atmospheric pressure on Earth.

But the carbon dynamic in these forests is not fully understood, making it difficult to know how well this plan is reducing atmospheric levels of CO2.

Although chlorine levels are falling, thanks to agreements that banned chlorofluorocarbons, levels of bromine — which is 45 times more effective at zapping ozone — are still rising, says atmospheric chemist Dale Hurst of the National Oceanic and Atmospheric Administration in Boulder, Colorado.

As shown in previous studies, the litter from the polluted site, which had endured high levels of atmospheric nitrogen oxides and ozone, had higher nitrogen content than litter from the clean site.

«Low level of oxygen in Earth's middle ages delayed evolution for two billion years: A low level of atmospheric oxygen in Earth's middle ages held back evolution for 2 billion years, raising fresh questions about the origins of life on this planet.»

Myers and other researchers have found atmospheric CO2 levels predicted for mid-century — around 550 parts per million — could make food crops lose enough of those key nutrients to cause a protein deficiency in an estimated 150 million people and a zinc deficit in an additional 150 million to 200 million.

A low level of atmospheric oxygen in Earth's middle ages held back evolution for 2 billion years, raising fresh questions about the origins of life on this planet.

E. coli cells will be genetically engineered to change color in response to conditions under study: carbon dioxide levels, atmospheric pollutants and pathogens, for example.

Assuming atmospheric pressure at ground level, nine atm is more than enough to «hang» a water column in a narrow tube (tracheids or vessels) from the top of a 100 meter tree.

A team from Fukushima University recently mapped radiation levels at 370 spots in the prefecture and, using weather balloons, confirmed that atmospheric radiation levels have dropped to near background levels.

Two new studies look far back in geologic time to determine how sensitive the global climate is to atmospheric CO2 levels

«Some people believe a change in the level of atmospheric carbon dioxide may have played a role.

At a global level, the excess of atmospheric CO2 is absorbed by ocean waters and it causes changes in water chemistry (pH decrease or ocean acidification).

The new research shows atmospheric carbon levels returned to normal within a few thousand years after the first pulse, probably as carbon dissolved in the ocean.

Also associated with this event are high levels of carbon dioxide in the atmosphere, which are linked to elevated ocean and atmospheric temperatures.

Overall, dippers had higher mercury levels than most other songbirds tested in western North America, which may be due to more atmospheric deposition of mercury in snow at these high elevations.

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).

«Significant increases in summer temperatures will affect the carbon cycling in the lakes, with potential consequences on atmospheric carbon dioxide levels and the Earth's climate,» he added.

The results, in the October 15 Science, agree with theoretical predictions, suggesting that superconducting gravimeters can help satellites chart the earth's gravity to map changes in polar ice cap thickness, seawater levels, atmospheric density and planetary geology.

A curious detail also shown by the study is a reduction in atmospheric pollution from lead during the last few decades, which, as Lozano concludes, «suggests that the global measures taken to reduce lead emissions, such as the use of lead - free gasoline, have helped to reduce the levels of this metal in the atmosphere.»

In the samples studied by the scientists, there are also high levels of atmospheric contamination from lead during the Roman Empire, when large quantities of this metal were extracted in the south of the Iberian Peninsula, as well as during the past 300 years, coinciding with the Industrial Revolution and the reactivation of mining activity in southern SpaiIn the samples studied by the scientists, there are also high levels of atmospheric contamination from lead during the Roman Empire, when large quantities of this metal were extracted in the south of the Iberian Peninsula, as well as during the past 300 years, coinciding with the Industrial Revolution and the reactivation of mining activity in southern Spaiin the south of the Iberian Peninsula, as well as during the past 300 years, coinciding with the Industrial Revolution and the reactivation of mining activity in southern Spaiin southern Spain.

Carbon burial is an important metric when it comes to predicting future atmospheric carbon dioxide levels because, once carbon is in the sediments, it has the potential to remain there and not contribute to the greenhouse effect.

As atmospheric CO2 levels rise, those in the oceans do too, changing the chemistry of the seawater.

Saikawa, a specialist in atmospheric chemistry, is also studying levels of black carbon emissions in the outdoor environment generated by the burning of biomass fuels like yak dung.

This new research helps to establish how coastal waters influence atmospheric carbon dioxide levels and, in turn, climate.

From the geochemical analyses carried out on the sediments deposited during the past 10,000 years in the Laguna de Rio Seco lagoon, a remote alpine lake in Sierra Nevada, at 3,020 m. above sea level, evidence has been found of atmospheric pollution from lead.

Scientists can determine ancient atmospheric concentrations by measuring CO2 and methane levels in tiny air bubbles trapped in such ice, formed when the ice fell to the earth as snow.