Sentences with phrase «organic carbon over»

I think Peter Ward's theory probably has O2 sinking for other reasons, an imbalance of the burial and weathering of organic carbon over geologic time for example.

The methodology quantifies increased carbon sequestration in aboveground biomass, belowground biomass, and soil organic carbon over and above the baseline scenario.

Not exact matches

This organic whole that began from an initial high bang and eventuated into the present universe is distinguished by a form of unity and diversity radical beyond all imagining: infinite differences, and diversity that is marked not by isolation but by shared atoms over millennia as well as minute - by - minute exchanges of oxygen and carbon dioxide between plants and animal.

Certifications other than organic don't do much to reduce carbon footprint over conventional farming, suggesting that standards need to be modified to encourage footprint - lowering practices.

A 20 percent increase in soil organic matter as a result of organic agriculture would result in an estimated amount of 9 tonnes carbon per ha, which is in line with the results over a 15 - year period103.

Worldwide, peatlands store massive amounts of carbon in thick blankets of wet organic matter accumulated in the ground over centuries.

A team led by scientists at Lawrence Berkeley National Laboratory found that the type of plant inputs (that is, root or needle litter) affected total carbon and nitrogen retention over 10 years, but that soil horizon (essentially, the layer of soil, such as the topsoil organic or deeper mineral layers) affected how the litter - derived soil organic material is stabilized in the long term.

The opportunity to pour carbon back into the soil exists because farming over the past century has depleted its levels of organic carbon, Rice notes.

Lead author PhD student Adam Hejnowicz said: «Seagrass meadows could play a vital role in combating climate change as they are regarded as a net global sink for carbon.They have the capacity to bury significant deposits of organic carbon beneath the sediment, up to many metres thick in places and over millenary time scales.»

As photosynthesis favours the lighter isotope, carbon 12, over the heavier carbon 13, this «light» ratio finding suggests that organic material from biological sources may have been more abundant in diamond - forming zones early in the Earth's history than we find today,» explained Suzette Timmerman, lead author on the study.

«Land - derived organic carbon is having a growing influence on Arctic and subarctic ponds, which carries over into the food web,» according to the authors of the study.

Carozza et al (2011) find that natural global warming occurred in 2 stages: First, global warming of 3 ° to 9 ° C accompanied by a large bolus of organic carbon released to the atmosphere through the burning of terrestrial biomass (Kurtz et al, 2003) over approximately a 50 - year period; second, a catastrophic release of methane hydrate from sediment, followed by the oxidation of a part of this methane gas in the water column and the escape of the remaining CH4 to the atmosphere over a 50 - year period.

Radiocarbon dating (also referred to as carbon dating or carbon - 14 dating) is a method for determining the age of an object containing organic material by There has been a growing trend of younger women — older men dating over the years.

Over time and use, chimneys get clogged up with a carbon, organic compound known as creosote.

The Uniti vehicle, which features a lightweight carbon fiber body and «organic composite» interior, is said to be «optimised for high performance and agility in urban environments,» and to emit «75 % less carbon than mainstream electric cars» over its entire lifecycle.

Sea salt comes from sea spray over the oceans, dust from dry desert areas, black carbon from burning of forests and fossil fuels, sulphates derive from ocean plankton and burning coal, nitrates derive from fertiliser use, car exhausts and lightning, and secondary organics come from the stew of volatile organic compounds from industrial and natural sources alike.

Carozza et al (2011) find that natural global warming occurred in 2 stages: First, global warming of 3 ° to 9 ° C accompanied by a large bolus of organic carbon released to the atmosphere through the burning of terrestrial biomass (Kurtz et al, 2003) over approximately a 50 - year period; second, a catastrophic release of methane hydrate from sediment, followed by the oxidation of a part of this methane gas in the water column and the escape of the remaining CH4 to the atmosphere over a 50 - year period.

The dimming by sulfates, nitrates, and carbonaceous (black and organic carbon) species has been shown to disrupt and weaken the monsoon circulation over southern Asia.

«Thus, human beings are now carrying out a large scale geophysical experiment of the kind that could not have happened in the past... Within a few centuries we are returning to the atmosphere and oceans the concentrated organic carbon stored in sedimentary rocks over hundreds of millions of years.»

Composed of waterlogged organic material that has built up over millennia, even relatively small areas of peat acts like super storehouses for carbon.

These regions are crucial to the global carbon cycle because they are rich in soil organic carbon, which has built up in frozen soils and peat layers over thousands of years.

Not accounting for these volumes can result in overestimating soil organic carbon by over 40 % at some sites.

Study: Long - term warming equivalent to 10 °C per century could be sufficient to trigger compost - bomb instability in drying organic soils Wiley: First generation climate — carbon cycle models suggest that climate change will suppress carbon accumulation in soils, and could even lead to a net loss of global soil carbon over the next century.

As the thawed layer deepened over the summer, the researchers found, the age of dissolved organic carbon rose by 120 - 125 %, while the age of carbon dioxide rose by 59 - 63 %.

Within only a few centuries we are returning to the atmosphere and oceans the concentrated organic carbon stored in sedimentary rocks over hundreds of millions of years.

One of the biggest concerns is that as the permafrost thaws over increasingly longer summers, an enormous amount of carbon dioxide currently stored in dead organic matter in the soil could be released to the atmosphere, which would further contribute to the warming of the planet and affect regions far from the Arctic Circle.

Following these findings, the researchers recommend shorter productivity measurements to help minimize the effect of respiratory and dissolved organic carbon loss and hopefully produce more precise estimates of the ocean's global carbon productivity over smaller increments of time.

Ito and Penner (2005) estimated that emissions of fossil and biofuel organic carbon increased by a factor of three over the period 1870 to 2000.