Sentences with phrase «for atmospheric carbon»

Overall, the report confirms that Alaska is still a «sink» for atmospheric carbon, absorbing about 3.7 million tonnes a year from the atmosphere, and the greening of the region may increase this capacity.

Given this trend, strategies for atmospheric carbon dioxide removal (CDR), are being considered for climate change mitigation.

In turn, the temperature limit has implications for atmospheric carbon dioxide (CO2), which has already increased from the pre-industrial level of 280 parts per million (ppm) to 383 ppm today and is rising by about 2 ppm per year.

There are numerous scientific bases for setting 350 parts per million (ppm) as the uppermost safe limit for atmospheric carbon dioxide (CO2) concentrations.

Other studies have separately confirmed that old forest giants paradoxically store more carbon than young, fast - growing competitors, and that natural, highly diverse woodland is a better instrument for atmospheric carbon absorption.

The generally accepted threshold for atmospheric carbon dioxide is 450 ppm.

Repeated drought and tree loss mean that there is increasing risk that the forest may one day cease to be a «sink» for atmospheric carbon released by the combustion of fossil fuels.

As we continue to blow past records for atmospheric carbon concentrations, ocean acidification, species extinction and temperature extremes, it is hard to see the attempt as anything but a failure.

available peer - reviewed, science - based evidence to model the implications of their proposals for atmospheric carbon dioxide concentrations, global mean surface temperature, sea level rise, and other climate change impacts at the global scale.

Although the P sub (CO2) values in reef waters exhibited large diurnal changes ranging from 160 to 520 microatmospheres, they indicate that the reef flat area is a net sink for atmospheric carbon dioxide.

The role of the world's forests as a «sink» for atmospheric carbon dioxide is the subject of active debate.

So to hope that grasslands by themselves could offset even some of this one looming source for atmospheric carbon is clearly (and unfortunately) not realistic.

The north Atlantic Ocean is globally important, as it is a sink for atmospheric carbon dioxide, said Eric Achterberg, chief scientist for the research cruise and lead author of the study.

The Amazon's tropical forests are one of the largest sinks for atmospheric carbon dioxide on the planet.

Not exact matches

One possible strategy for making Mars habitable over the long term is to «terraform» it — manipulate its environment so, in the simplest terms, the planet warms up, ice turns into water, and plants can be introduced, which will convert the atmospheric carbon dioxide into oxygen, with the goal of creating a stable and breathable atmosphere.

I want to discuss a contemporary moral epidemic: the notion that increasing atmospheric concentrations of greenhouse gases, notably carbon dioxide, will have disastrous consequences for mankind and for the planet.

Moreover, the impressive breadth of Ruether's argument makes her susceptible to criticism from a variety of quarters: biblical scholars may disagree with her interpretation of Paul; environmental scientists, with her figures on atmospheric carbon dioxide content; and agricultural and nutritional experts, with her recipe for relying on consumption of seasonal, locally produced foods.

What current atmospheric carbon dioxide concentration tells us about the need to stabilise the global climate and the need for a step change in government, city and business action.

In addition to the isotope concentration, the air bubbles trapped in the ice cores allow for measurement of the atmospheric concentrations of trace gases, including greenhouse gases carbon dioxide, methane, and nitrous oxide.

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).

«Stabilizing or reducing atmospheric carbon dioxide concentrations, therefore, requires very deep reductions in future emissions to compensate for past emissions that are still circulating in the Earth system,» the draft report says.

This graph shows the ratio of warming from accumulated atmospheric carbon dioxide to warming from combustion for coal, oil, and gas plants over time.

Jacobson, the director of Stanford's Atmosphere / Energy Program and a senior fellow at the Woods Institute for the Environment and the Precourt Institute for Energy, said almost 8.5 billion tons of atmospheric carbon dioxide — or about 18 percent of all anthropogenic carbon dioxide emissions - comes from biomass burning.

Freshwater such as lakes, though, receive various sources of carbon dioxide from decomposing organic and inorganic matter swept into them, which makes it hard for scientists to distinguish between the direct effects of rising atmospheric CO2 and these other elements.

To explain this apparent paradox, the researchers called upon a theory for how the global carbon cycle, atmospheric carbon dioxide and Earth's temperature are linked on geologic timescales.

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.

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

«If the initial atmospheric carbon dioxide concentration were half its actual value, we would currently be experiencing the climate expected for the year 2050,» says Archer, setting out one possible scenario.

Black carbon aerosols — particles of carbon that rise into the atmosphere when biomass, agricultural waste, and fossil fuels are burned in an incomplete way — are important for understanding climate change, as they absorb sunlight, leading to higher atmospheric temperatures, and can also coat Arctic snow with a darker layer, reducing its reflectivity and leading to increased melting.

Their results suggest a drop of as much as 10 degrees for fresh water during the warm season and 6 degrees for the atmosphere in the North Atlantic, giving further evidence that the concentration of atmospheric carbon dioxide and Earth's surface temperature are inextricably linked.

The trouble is, ice cores are the gold standard for estimating past atmospheric carbon dioxide levels, and Marchant says the Dry Valley glaciers are the only ones known to contain ice that old.

Scientists thought that by providing iron, a trace element required for growth, they could create large plankton blooms and draw down atmospheric carbon dioxide.

«As remarkable as it is that climate can change that quickly naturally, what is even more remarkable is that some of the rates of change we're experiencing today — increases in atmospheric carbon dioxide for example — are faster than anything we've been able to find in the past several million years of geologic history.

The scientists knew that under atmospheric pressure all compounds of carbon, hydrogen, and oxygen, except for methane, water, and carbon dioxide, are thermodynamically unstable.

Rising atmospheric levels of carbon dioxide, blamed for global warming, may have a subterranean silver lining.

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.

Some convert atmospheric nitrogen into bioavailable forms that are then exchanged for carbon from the plant.

The atmospheric concentration of carbon dioxide, a critical greenhouse gas, is higher than it has been for at least 650,000 years.

The model also accounted for natural drivers of change, including the direct influence of increased carbon dioxide on ocean - carbon uptake and the indirect effect that a changing climate has on the physical state of the ocean and its relationship to atmospheric carbon dioxide.

Because of carbon monoxide's central role in atmospheric chemistry, there are many possible explanations for this sudden decline, involving both sources and sinks of the gas.

Even if all greenhouse emissions were to stop today, atmospheric carbon dioxide will remain high for millennia, and ocean surface temperatures will stay elevated even longer, a new study predicts.

But Sideras - Haddad points out that the window for carbon - 14 dating is closing, because atmospheric levels will soon have returned to pre-1950s amounts.

Human - induced changes to Earth's carbon cycle — for example, rising atmospheric carbon dioxide and ocean acidification — have been observed for decades.

The planet also passed a grim milestone: an atmospheric carbon dioxide concentration of 400 parts per million, including remote Antarctica, which hasn't seen that much CO2 for 4 million years.

We have no idea, for example, how much of the atmospheric carbon being absorbed by the surface of the oceans reaches the bottom, nor how long that takes.

As for the paper's conclusion that removing atmospheric carbon is necessary in order to achieve the 2 ˚C target, climate scientist Richard Moss of the Pacific Northwest National Laboratory's Joint Global Change Research Institute in College Park, Maryland, says that's a nearly impossible goal «with what we know about today.»

Although scientists have measured atmospheric CO2 levels for decades, the current network of ground stations, observatories, aircraft and other instruments emerged during an era when researchers were trying to answer questions about the total amount of carbon dioxide in the atmosphere.

Iron encourages the bloom of tiny algae called phytoplankton, which take in carbon dioxide (CO2) dissolved in the ocean for photosynthesis; that process in turn draws atmospheric CO2 into the surface waters.

They were Jorge Sarmiento, an oceanographer at Princeton University who constructs ocean - circulation models that calculate how much atmospheric carbon dioxide eventually goes into the world's oceans; Eileen Claussen, executive director of the Pew Center for Global Climate Change in Washington, D.C.; and David Keith, a physicist with the University of Calgary in Alberta who designs technological solutions to the global warming problem.

«It's a tricky area of study, but omitting the coastal ocean from the overall carbon budget leaves a gap in projections for future atmospheric CO2 levels.»