Sentences with phrase «source of sediment»

The Holderness coast, says Pethick, is the North Sea's largest single source of sediment.

To verify the source of the sediments I am holding, I would need to take them to a lab for chemical analysis.

Since the Andes is the principal source of sediments to the Amazon river system, the consequences of this massive reduction will be dramatic: river channels will become deeper, reducing seasonal floods which are necessary to bring fluvial sediments and nutrients to floodplain environments and provide connectivity between environments for both migrant fish and people.

Despite being of vital importance to island development and future maintenance, the sources of the sediment that are most important to island building, and the rates at which this sediment is produced, has remained very poorly examined.

And I was wondering where the source of the sediments was, if they know (is it for example a river outflow collecting sediment from a catchment?

Not exact matches

Thirteen of 25 samples surpassed 100 ppm, «indicating that the sediments could be a potential source of lithium for the underlying aquifers,» the company stated.

Livestock production is the largest source of water pollutants, principally animal wastes, antibiotics, hormones, chemicals from tanneries, fertilizers and pesticides used for feed crops, and sediments from eroded pastures.

By validating model results against geological observations, the study indicates that changes in runoff, sea level and wave energy have profoundly affected the past evolution of the Great Barrier Reef not only in regard to reefs evolution but also sediment fate from source - to - sink.

After analyzing the data, researchers found radiocesium from the Fukushima Daiichi Nuclear Power Plant accident in the sediment samples along with a high fraction of clay material, which is characteristic of shelf and slope sediments suggesting a near shore source.

But as countries seek new energy sources to drive economic growth, a surge in dam construction on the eastern flank of the Andes could further threaten fish migration and sediment flows, Elizabeth Anderson, a conservation ecologist at Florida International University in Miami, and colleagues warn today in Science Advances.

The sediments also revealed that over time, more and more of the pipe network came from sources distant from Naples.

The researchers measured falling oxygen levels at the surface of the sediment coupled with a disappearance of hydrogen sulfide (a food source to bacteria) a few centimeters below.

The shale, named for the town of Eagle Ford, TX, is a geologic remnant of the ancient ocean that covered present day Texas millions of years ago, when the remains of sea life (especially ancient plankton) died and deposited onto the seafloor, were buried by several hundred feet of sediment, eventually turning into the rich source of hydrocarbons we have today.The shale was first tapped in 2008 and now has around 20 active fields good producing over 900 million cubic feet per day of natural gas.

It helped that the sediments contained «literal crap tons» of mastodon dung, a rich source of organic matter that was perfect for dating, she says.

Bones are the usual source of ancient human DNA, but last spring, scientists announced that they had managed to pick it up from cave sediments.

[Martin Solan et al, Anthropogenic sources of underwater sound can modify how sediment - dwelling invertebrates mediate ecosystem properties]

However, many of the sources along the continental slope lie at cold depths in which ices have formed at high pressures within sea - floor sediments, which once trapped methane produced by microbes living there.

We report an observation of the YTT in Africa, recovered as a cryptotephra layer in Lake Malawi sediments, > 7,000 km west of the source volcano.

Here we report an observation of the YTT in Africa, recovered as a cryptotephra layer in sediments cored from Lake Malawi > 7,000 km west of the source volcano in Sumatra.

Furthermore, we can exclude most other potential sources of coral sediment on the basis of grain size at the point of generation or ecological rarity criteria.

Harnessing a Methane - Fueled, Sediment - Free Mixed Microbial Community for Utilization of Distributed Sources of Natural Gas — Jeffrey J. Marlow — Biotechnology and Bioengineering

Even if you ignore all the temperature meauserments which you seem to vehimently deny there is still many other sources of evidence associated with this increase such as — ice melt / extreme weather events / sea current changes / habitat changes / CO2 / ice cores / sediment cores.

Organic carbon source and salinity shape sediment bacterial composition in two China marginal seas and their major tributaries — Kai Wang — Science of The Total Environment

Mafic LIPs, covering ≥ 50 000 — 100 000 km2 in area, contain significant amounts of mafic rocks distributed across Gondwana, and therefore stand out as one of the major and potential global sediment sources.

Warmer water and increased sediment loads are harming lake trout, an important source of food for native communities.

The endeavor becomes more scientifically challenging in light of the large variety of information sources about past climate, including tree rings, coral, glacier ice, and marine and lake sediments, not to mention the complicated array of data that are used to establish the timelines that underlie the paleoclimate records.

Wallace S. Broecker: Preface 1: Jean - Pierre Gattuso and Lina Hansson: Ocean Acidification: Background and History 2: Richard E. Zeebe and Andy Ridgwell: Past Changes of Ocean Carbonate Chemistry 3: James C. Orr: Recent and Future Changes in Ocean Carbonate Chemistry 4: Andrew H. Knoll and Woodward W. Fischer: Skeletons and Ocean Chemistry: The Long View 5: Markus G. Weinbauer, Xavier Mari, and Jean - Pierre Gattuso: Effect of Ocean Acidification on the Diversity and Activity of Heterotrophic Marine Microorganisms 6: Ulf Riebesell and Philippe D. Tortell: Effects of Ocean Acidification on Pelagic Organisms and Ecosystems 7: Andreas J. Andersson, Fred T. Mackenzie, and Jean - Pierre Gattuso: Effects of Ocean Acidification on Benthic Processes, Organisms, and Ecosystems 8: Hans - Otto Pörtner, Magda Gutowska, Atsushi Ishimatsu, Magnus Lucassen, Frank Melzner, and Brad Seibel: Effects of Ocean Acidification on Nektonic Organisms 9: Stephen Widdicombe, John I. Spicer, and Vassilis Kitidis: Effects of Ocean Acidification on Sediment Fauna 10: James P. Barry, Stephen Widdicombe, and Jason M. Hall - Spencer: Effects of Ocean Acidification on Marine Biodiversity and Ecosystem Function 11: Frances Hopkins, Philip Nightingale, and Peter Liss: Effects of Ocean Acidification on the Marine Source of Atmospherically - Active Trace Gases 12: Marion Gehlen, Nicolas Gruber, Reidun Gangstø, Laurent Bopp, and Andreas Oschlies: Biogeochemical Consequences of Ocean Acidification and Feedback to the Earth System 13: Carol Turley and Kelvin Boot: The Ocean Acidification Challenges Facing Science and Society 14: Fortunat Joos, Thomas L. Frölicher, Marco Steinacher, and Gian - Kasper Plattner: Impact of Climate Change Mitigation on Ocean Acidification Projections 15: Jean - Pierre Gattuso, Jelle Bijma, Marion Gehlen, Ulf Riebesell, and Carol Turley: Ocean Acidification: Knowns, Unknowns, and Perspectives Index

Evidence for regional warmth during medieval times can be found in a diverse but more limited set of records including ice cores, tree rings, marine sediments, and historical sources from Europe and Asia, but the exact timing and duration of warm periods may have varied from region to region, and the magnitude and geographic extent of the warmth are uncertain.

The team also correlated their findings with other studies of California climate history, and for the first time, cross-referenced these with histories of the Pacific Ocean's temperature taken from marine sediment cores and other sources.

Land degradation is also a leading source of land - based pollution for the oceans, as polluted sediment and water washes down major rivers.

Historical sources of polychlorinated biphenyls to the sediment of the New York / New Jersey Harbor Elena Patrusheva (Berdsk, Russia) I am a 38 year old male divorcee, I initial received this e-mail, from Elena on the Dating faces

Embodying the «grounding» of Los Angeles's water and power infrastructure, which span vast distances, Δ is of the landscape — a bit of sediment washed down from the San Joaquin River Delta and a transplant from the source.

Could there be something different about the local source material — ocean plankton producing one kind of sediment exposed to the atmosphere, versus say peat bogs or coal seams being washed out upstream and delivering locally derived material directly to the sediment beds?

Such study will require multiple year - round exploration campaigns, including drilling of sub-sea permafrost to evaluate the sediment CH4 potential and comprehensive atmospheric measurements to assess the ESAS strength as a greenhouse gas source.

... indicates that glacial sediment sources were different from modern ones, which could reflect changes in the catchment areas of the glaciers and ice streams.

Anoxic sediments have been widespread in the past and are of great economic importance as source rocks for hydrocarbon deposits.

Also, because water reservoirs are designed to be connected to a water source such as a river, these manmade dams receive high amounts of organic matter and sediment; thus, the continuing production of methane.

Evidence for regional warmth during medieval times can be found in a diverse but more limited set of records including ice cores, tree rings, marine sediments, and historical sources from Europe and Asia, but the exact timing and duration of warm periods may have varied from region to region, and the magnitude and geographic extent of the warmth are uncertain.

First through reductions in calcium carbonate polymorph super-saturation and then by dissolution of water column and sediment sources.

In order to provenance sediment sources, it is necessary to look at both the composition of the sediment and the geological characteristics of the adjacent land.

«The primary sources of calcium carbonate for deep sea sediments are pelagic calcitic coccolithophores and foraminifera that grow dominantly in the phototic zone (typically upper 100 m) and to a lesser extent aragonitic pteropods.

The tertiary source of CaCo3 is sediments themselves — in both coastal areas and open water — as fined grained sediment, shell and coral.

Mappings of the geochemistry and magnetic susceptibility of detrital sources in the watershed of the lagoon and from the coastal barriers were undertaken in order to track the terrestrial or coastal / marine origin of sediments deposited into the lagoon.

Given that calving Patagonia glaciers were far more sensitive to climate fluctuations than western Antarctica, and given the likelihood that paleo sea - ice extent around Antarctica deflected iceberg drift from present pathways, it would be helpful to know how they confirmed the respective continental sources of any dated sediments.

Salles and colleagues present an open - source python framework for calculating sediment transport and the development of coral reef systems over geological time.

Methane hydrate in ocean seabed sediments is a potential source of methane (CH4) to the atmosphere, where CH4 has potential to act as a powerful greenhouse gas.

This «new evidence» is based on a single analysis of «proxy» data (that is, data that do not come from thermometers but rather from sources like tree rings, ice cores, corals, and ocean and lake sediments) showing the twentieth century to be the warmest in the past thousand years.

Another vast source of methane is in icy deposits known as methane hydrates, often in sediments deep under the world's oceans.

«Other sediments continued to be deposited and further buried the oganic - rich sediment layer to depths of thousands of feet, compressing the layers into a rock that would become the source for oil.

«Thus, in a healthy reef, bioeroders dissolution of CaCO3 sediment appears to be an important component of the natural CaCO3 turnover and a substantial source of alkalinity as well.