Sentences with phrase «with atmospheric carbon»

The climate was hot and dry, with atmospheric carbon dioxide levels sitting at about 2,000 parts per million (ppm)-- far higher than our current level of about 405 ppm.

Photosynthetic processes are accelerated with the increased availability of carbon dioxide in the atmosphere and, hence, it is conjectured that ring growth would also be correlated with atmospheric carbon dioxide; see Graybill and Idso (1993).

The acrylic content also interferes with hydration and makes the lamina more sensitive to carbonation — a reaction with atmospheric carbon dioxide — that leads to embrittlement and a decrease in elasticity.

Agricultural productivity will rise for the next two centuries or so, along with the atmospheric carbon dioxide level, after which it will fall away.

With atmospheric carbon already at concentrations that consensus science deems unsafe, these solutions will likely be a necessary part of long - term strategies to prevent the most catastrophic impacts of climate change.

While the paper does not extend to the medieval maximum, from charcoal in lake bed studies it documents increased biomass burning and deforestation during agricultural and population expansion in the Neotropics from 2500 to 500 years BP, which would correspond with atmospheric carbon loading and global warming 1100 to 650 years BP.

The world crossed a perilous and alarming threshold, with atmospheric carbon dioxide levels exceeding 400 ppm, a level that has not been experienced in at least 800,000 years and possibly not for millions of years.

«around 1979... atmospheric temperatures began to climb in tandem with atmospheric carbon....

But with atmospheric carbon climbing at an annual rate of 2 ppm and expected to accelerate to 3 ppm, levels could approach 900 ppm by the end of the next century, and conditions that bring about the beginnings of ocean anoxia may be in place.

This page is regularly updated with atmospheric carbon dioxide level data; based on the previous month in the current year

But the IPCC report recently stated, «with atmospheric carbon dioxide levels rising almost twice as fast in the first decade of this century as they did in the last decades of the 20th century,» so I imagine usage rates are and will continue going up for some time yet.

Photosynthetic processes are accelerated with the increased availability of carbon dioxide in the atmosphere and, hence, it is conjectured that ring growth would also be correlated with atmospheric carbon dioxide; see Graybill and Idso (1993).

«We grew teosinte in the conditions that it encountered 10,000 years ago during the early Holocene period: temperatures 2 - 3 degrees Celsius cooler than today's with atmospheric carbon dioxide levels at around 260 parts per million,» said Dolores Piperno, senior scientist and curator of archaeobotany and South American archaeology at the Smithsonian's National Museum of Natural History and the Smithsonian Tropical Research Institute, who led the project.

Lowe hypothesizes that rain combined with atmospheric carbon dioxide to make carbonic acid, which weathered jutting mountains of newly formed continental crust.

«With atmospheric carbon dioxide at unprecedented levels, our sense of urgency has only increased,» said Basilio.

Scientists on the Indian - German expedition, known as LOHAFEX, grew a 300 - km2 patch of algae in hopes that the plants» carbon would fall kilometers below, taking with it the atmospheric carbon it had pulled in during growth.

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.

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.

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).

Worldwide, carbon storage has the capability to provide more than 15 percent of the emissions reductions needed to limit the rise in atmospheric CO2 to 450 parts per million by 2050, an oft - cited target associated with a roughly 50 - percent chance of keeping global warming below 2 degrees, but that would involve 3,200 projects sequestering some 150 gigatons of CO2, says Juho Lipponen, who heads the CCS unit of the International Energy Agency in Paris.

His data, published in 1938, showed a temperature rise that correlated with a rise in atmospheric carbon dioxide.

The iconic «Keeling curve,» a 56 - year record of rising atmospheric carbon dioxide levels, will continue with support from American philanthropists Eric and Wendy Schmidt.

Previous ocean sediment records suggest that, as the world slipped into the last glacial period, less carbon overall reached the sediments of the Southern Ocean, coinciding with declining atmospheric carbon dioxide.

James McCarthy, professor of biological oceanography at Harvard, says this summer's record heat and dryness could have occurred with lower atmospheric carbon dioxide concentrations — but it would have been highly unlikely.

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

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.

«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.

Researchers have found a gene that promotes faster - growing and larger roots, which could lead to plants with a robuster ability to sequester excess atmospheric carbon

During the PETM, atmospheric carbon dioxide more than doubled and global temperatures rose by 5 degrees Celsius, an increase that is comparable with the change that may occur by later next century on modern Earth.

Undertaken by University of Adelaide in collaboration with CSIRO, the research could make viable a process that has enormous potential to replace fossil fuels and continue to use existing carbon - based fuel technologies without increasing atmospheric CO2.

These little organisms are central to the global carbon cycle, a role that could be disrupted if rising levels of atmospheric carbon dioxide and warming temperatures interfere with their ability to grow their calcified shells.

The second simulation overlaid that same weather data with a «pseudo global warming» technique using an accepted scenario that assumes a 2 - to 3 - degree increase in average temperature, and a doubling of atmospheric carbon dioxide.

Although plants grown in high levels of carbon dioxide — say, double the current atmospheric concentrations — initially grow rapidly, the growth tapers off within weeks and the plants wind up with a low protein content.

The 2 ° C threshold is often equated with keeping the atmospheric concentration of carbon dioxide below 450 parts per million (ppm).

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.

David Fahey, an atmospheric scientist at the National Oceanic and Atmospheric Administration in Boulder, Colorado, said that the researchers will need to do additional analyses to reduce the «significant uncertainties associated with the role of black carbon in the climate.»

«Human influence is so dominant now,» Baker asserts, «that whatever is going to go on in the tropics has much less to do with sea surface temperatures and the earth's orbital parameters and much more to do with deforestation, increasing atmospheric carbon dioxide and global warming.»

And it finds that, while this winter's unusually strong Arctic Oscillation - which funnels cold northern air to the East Coast and pulls warm mid-latitude air up to the Arctic - is predicted as atmospheric carbon dioxide levels rise, seasonal temperature anomalies associated with it aren't enough to blunt long - term warming trends.

Fertilizing the ocean with iron could help reduce atmospheric carbon dioxide levels, according to newly released findings of a research cruise.

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.»

«OCO - 2 was designed to help locate and identify natural regional processes that serve as sources and sinks of atmospheric carbon dioxide, and how these vary with time and location,» explained Annmarie Eldering, a NASA scientist working on the mission.

The study argued that changes in the sun's radiation output played a major role in influencing shifts in Arctic air temperatures — a view at odds with mainstream climate science, which fingered atmospheric carbon dioxide as a bigger player.

Siberian surface rock was loaded with carbon, resulting in runaway global warming as atmospheric CO2 levels more than doubled.

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.

«Now with treaties banning atmospheric testing, carbon - 14 levels are tapering off,» he says.

Using specially developed model configurations, the team studies how Arctic whitening would be expected to play out in a world with four times the preindustrial amount of atmospheric carbon dioxide, and an Arctic that is about 10 degrees Celsius hotter (18 degrees Fahrenheit).

But with that see - saw battle going on in the tropics, the result was that overall, tropical forests» impact on atmospheric carbon dioxide was a wash - deforestation emitted about the same amount that was captured in forest growth.

Such models could help environmental planners cultivate microbial mixes that achieve a desired end — which could be soil that locks up gigatons of atmospheric carbon, or that sloughs off pollution with ease, or that yields the kinds of grapes vintners dream about.

Model simulations of 20th century global warming typically use actual observed amounts of atmospheric carbon dioxide, together with other human (for example chloroflorocarbons or CFCs) and natural (solar brightness variations, volcanic eruptions,...) climate - forcing factors.

These fuels produced from atmospheric CO2 are carbon - neutral and do not compete with food production for agricultural crop land.