Sentences with phrase «organic carbon during»

«After examining rocks 450 million years old or older, we believe the drop was caused by a massive burial of organic carbon during the time period,» Quinton said.

Plants absorb carbon dioxide from the atmosphere and convert it to organic carbon during photosynthesis.

Not exact matches

The team's findings provide one possible mechanism for an observed increase in the concentration of dissolved organic carbon in the surface waters of North America and Europe during the last few decades, and have implications for management of water quality in coastal zones worldwide.

During Curiosity's first «meals» of Martian soil, baked inside the robot's ovens, carbon and hydrogen were found to have reacted with chlorine, creating organic molecules.

Their research further reveals that another organic abiotic compound is formed during the vent circulation process at adjacent lower temperature, higher pH vents, but reaction rates are too slow to completely reduce the carbon all the way to methane.

Changes in soil organic carbon storage predicted by Earth system models during the 21st century.

Billions of planktonic organisms, too tiny to be seen with the naked eye, make this valuable service possible: When carbon dioxide from the atmosphere dissolves in seawater, various species convert it to organic carbon and other organic components during photosynthesis.

Other possibilities are the decomposition of organic matter in terrestrial settings, or the release of methane and carbon dioxide from deeply buried rocks during volcanic events.

David, I havent been keeping up with all the PETM research, but I do recall that individual plankton recovered from Bass River, New Jersey show a single step CIE. Due to the high sedimentation rate of coastal fluvial systems, Bass River sediments are consistent with a much shorter duration of organic carbon release during the PETM (estimated as less than 500 years).

We introduce a carbon cycle model that would explain the PETM by global warming following a bolide impact, leading to the oxidation of terrestrial organic carbon stores built up during the late Paleocene.

Then they measured how soil organic carbon is redistributed during different crop rotations — a land management practice intended to preserve nutrients in the soil.

Soot - Particles formed during the quenching of gases at the outer edge of flames of organic vapors, consisting predominantly of carbon, with lesser amounts of oxygen and hydrogen present as carboxyl and phenolic groups and exhibiting an imperfect graphitic structure.

Knies, J. & Stein, R. New aspects of organic carbon deposition and paleoceanographic implications along the northern Barents Sea margin during the last 30,000 years.

The carbon loss occurred first through the removal of the original vegetation, which stored much carbon in its leaves, stems and trunks; then through the oxidation of carbon in newly exposed soils; and finally through increased soil erosion, which carried away much of the organic - rich sediment during flooding.

While 50 % of the sequestered carbon formed during photosynthesis is respired before sinking into the dark depths, a tremendous pool of dissolved organic carbon has been created that may not be respired for decades, centuries or millennia and slowly contributes to the pool of DIC at various depths and locations (Giorgiou 2002).

«'' A second, rarely touched upon question is associated with the apparently limited amount of organic carbon that had been released from permafrost terrain in previous periods of climatic warming such as e.g. the Medieval Warm Period or during the Holocene Climatic Optimum.

In fact, if we continue on our current path of high heat - trapping emissions, the region is projected to see forest fires during June and July at two to three times its current rate.2, 6 Some 1 billion metric tons of organic matter and older - growth trees could burn7, 15 — accelerating the release of stored carbon and creating a dangerous global warming amplification or feedback loop.5, 14

In general, primary aerosol components (black carbon, hydrocarbon - like organic aerosol and biomass burning organic aerosol) dominated the local traffic and wood burning emissions whereas secondary components (oxygenated organic aerosol, nitrate, ammonium, and sulfate) dominated the PM1 chemical composition during the LRT episode.

They key, scientists explain, lies in ensuring that a sufficiently high enough percentage of organic carbon produced during the blooms reaches middle - depth waters, at which point it would remain in deeper underwater currents for decades.

«Modelling studies are also in moderately good agreement with observations during the first half of the 20th century when both anthropogenic and natural forcings are considered, although assessments of which forcings are important differ, with some studies finding that solar forcing is more important (Meehl et al., 2004) while other studies find that volcanic forcing (Broccoli et al., 2003) or internal variability (Delworth and Knutson, 2000) could be more important... The mid-century cooling that the model simulates in some regions is also observed, and is caused in the model by regional negative surface forcing from organic and black carbon associated with biomass burning.

The rapidity with which organic carbon can build up in soils is also indicated by examples of buried steppe soils formed during short - lived interstadial phases in Russia and Ukraine.

However, coatings of organic carbon aerosol on hygroscopic aerosol such as sulphate may lead to suppression of the rate of water uptake during cloud activation (Xiong et al., 1998; Chuang, 2003).