Sentences with phrase «organic carbon sinking»

Not exact matches

The carbon sink idea of the Kyoto Protocol (Article 3.4) may therefore partly be accomplished efficiently by organic agriculture.

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.»

We have shown that hydrothermal vent fluids contain almost none of the organic carbon which accumulates in the oceans, which means that vents are a sink for this unreactive «stored» carbon.»

Dr Jeff Hawkes, the lead author of this study, from the NOC said: «There has been a long outstanding question about whether hydrothermal vents are a source or sink of organic carbon to the oceans.

«It essentially means that, through multiple means, in a world with mixotrophs, more organic carbon is sinking into the deep ocean than in a world without mixotrophs,» Follows says.

That deep water is not only rich in nutrients, it also has relatively high concentrations of carbon dioxide, both because it is cold (cold water can absorb and hold more carbon dioxide than warm water) and because the decomposition of organic matter that sinks into the depths releases carbon dioxide.

As these more substantial microbes die, the researchers found they increase the flux of sinking organic carbon particles by as much as 35 percent.

The scientists focused on the ocean's biological pump, which exports organic carbon from the euphotic zone — the well - lit, upper ocean — through sinking particulate matter, largely from zooplankton feces and aggregates of algae.

Small, slow - sinking organic particles may play a bigger role than previously thought in the transport of carbon below the surface ocean.

«We are continuously asked, how much organic carbon and CO2 do gelatinous plankton sink worldwide, whether their export capacities are similar to phytoplankton and marine snow.

«And, what puzzles researchers working on the biological carbon pump: it is higher than that of non-calcifying phytoplankton and marine snow, the main sinking particles and organic carbon sources to the ocean interior».

References: Lebrato, M., de Jesus Mendes, P., Steinberg, D. K., Cartes, J. E., Jones, B. M., Birsa, L. M., Benavides, R. und Oschlies, A. (2013) Jelly biomass sinking speed reveals a fast carbon export mechanism Limnology and Oceanography, 58 (3), http://dx.doi.org/10.4319/lo.2013.58.3.1113 Lebrato, M., Pahlow, M., Oschlies, A., Pitt, K. A., Jones, D. O. B., Molinero, J. C. und Condon, R. H. (2011) Depth attenuation of organic matter export associated with jelly falls Limnology and Oceanography, 56, http://dx.doi.org/10.4319/lo.2011.56.5.1917 Lebrato, M., Pitt, K. A., Sweetman, A. K., Jones, D. O. B., Cartes, J. E., Oschlies, A., Condon, R. H., Molinero, J. C., Adler, L., Gaillard, C., Lloris, D. und Billett, D. S. M. (2012) Jelly - falls historic and recent observations: a review to drive future research directions Hydrobiologia, 690 (1), http://dx.doi.org/10.1007/s10750-012-1046-8

Stuck to their calcium carbonate platelets, organic matter sinks to the ocean floor — allowing surface layers to take up a new carbon dioxide from the atmosphere and process it.

A rapid depletion in 13C between about 17,500 and 14,000 years ago, simultaneous with a time when the CO2 concentration rose substantially, is consistent with release of CO2 from an isolated deep - ocean source that accumulated carbon due to the sinking of organic material from the surface.

(Then from conclusion):» Finally, the increased exudation of dissolved organic carbon might increase aggregation and potential for sinking of particles.»

Not only are they one of the most important carbon sinks, storing more carbon than both the atmosphere and the world's oil reserves, they also constantly remove carbon from the atmosphere through photosynthesis, which converts atmospheric carbon to organic matter.

As researchers concluded in a new study published in Geophysical Research Letters, ocean iron fertilization can only prove successful as a climate geoengineering approach if, in addition to phytoplankton bloom stimulation, «a proportion of the particulate organic carbon (POC) produced must sink down the water column and reach the main thermocline or deeper before being remineralized... and the third phase is long - term sequestration of the carbon at depth out of contact with the atmosphere.»

The Earth has two tried and proven carbon sinks, plants and organic calcium carbonate.

But in contrast to those models, DIC is rapidly assimilated into particulate organic carbon via photosynthesis, which raises pH. Particulate organic carbon (alive or dead) is heavy, and if not consumed and recycled, it sinks.

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 lower rate of respiration would allow more organic carbon to sink to deeper depths before being completely consumed.

The marine biota also redistribute carbon: marine organisms grow organic tissue and calcareous shells in surface waters, which, after their death, sink to deeper waters, where they are returned to the dissolved inorganic carbon reservoir by dissolution and microbial decomposition.

The efflux rate, or true sink rate, is the rate of mineralization or inorganic and organic, biotic, carbon; mostly due aquatic organisms.

Photosynthesis in the sunlit upper ocean produces O2, which escapes to the atmosphere; it also produces particles of organic carbon that sink into deeper waters before they

Forest regrowth may account for a large part of the land carbon sink in some regions (e.g., Pacala et al., 2001; Schimel et al., 2001; Hurtt et al., 2002; Sitch et al., 2005), while combustion of vegetation and soil organic matter may be responsible for a significant fraction of the interannual variability in CO2 (Cochrane, 2003; Nepstad et al., 2004; Kasischke et al., 2005; Randerson et al., 2005).

If by dissolved carbon you mean dissolved organic matter, this is particulate organic matter where the particles are so small that they don't sink.

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.

Animals and bacteria in the twilight zone often consume and further decompose the sinking marine snow, converting the carbon into dissolved organic and inorganic forms that can find their way back to the surface and then the atmosphere.