Sentences with phrase «sea sediment cores»

Milankovitch's theory was largely ignored until, in 1976, a study based on deep - sea sediment cores in Antarctica substantiated that changes in temperature going back 450,000 years largely conformed to changes in the Earth's orbit.

Beyond that are various isotopes isolated from ostracods etc. in deep sea sediment cores.

Thirty years ago when much of the research involved deep - sea sediment cores (fossils and chemistry) with millennial - scale intervals, there wasn't much data available to calculate meaningful confidence intervals.

... The evidence comes from a close correlation between inferred changes in production rates of the cosmogenic nuclides carbon - 14 and beryllium - 10 and centennial to millennial time scale changes in proxies of drift ice measured in deep - sea sediment cores.

There are some detailed pages of information that have been meticulously reconstructed after having passed through the cross-cut shredder of geological history: the information from ice cores and the deep sea sediment cores are obvious examples.

What is true is that there is very very strong evidence from paleoclimate data (deep sea sediment cores) for changes in the distribution of chemical tracers that must reflect changes in the deep circulation in the Atlantic.

Suppl., HR: 1340h AN: OS53B - 1101 Holocene Paleoceanography of the Chukchi Sea / Alaskan Margin, Western Arctic Ocean «A multi-proxy approach to the analysis of deep - sea sediment cores has been used to investigate paleoceanographical changes in the western Arctic.»

Preliminary results of microfossil analyses of Amundsen Sea sediment cores.

18Oc measured in foraminifera collected from deep sea sediment cores (Lisiecki et al., 2005).

The data come from deep - sea sediment cores dating to 205 million years ago that contain inorganic carbon - rich minerals as well as the organic remains of single celled marine phytoplankton.

However, foraminifera data are limited and difficult to obtain by deep - sea sediment coring, and the shells are not perfect proxies for ocean conditions.

Not exact matches

The aim of my PhD is to use the distribution of diatom species preserved in sediment cores across the Scotia Sea to reconstruct the position of major ocean boundaries and water masses through time.

Confirmation arrived in February this year, when an international team extracted 34 sediment cores from three sites on the seabed, revealing a fossilised coral reef that reaches 110 metres into the sea floor.

The team investigated sediment cores collected from Pine Island Bay in the Amundsen Sea from the German research vessel RV Polarstern on two expeditions in 2006 and 2010.

David Anderson of the University of Colorado at Boulder and his colleagues extracted cores of this fossil - filled sediment from the floor of the Arabian Sea to reconstruct monsoon intensity over the past 1,000 years.

Using sediment cores, long cylinders drilled into the marsh floor that offer scientists a look back through time, they were able to reconstruct sea - level changes since 1788.

Eelco Rohling of the University of Southampton in the UK and colleagues already had a record of the Red Sea's level going back 150,000 years, based on sediment cores.

Most of our sea - level records are based on the chemical make - up of sediment cores, which are hard to date — estimates can be thousands of years out.

«Thanks to the sediment core data, we have clear evidence that, during the last interglacial roughly 125,000 years ago, the central Arctic Ocean was still covered with sea ice during the summer.

Records of sea surface temperature from oceanic sediment cores, for example, show that the magnitude of warming following several previous glaciations are well - correlated (www.ncdc.noaa.gov/paleo/recons.html).

But the latest research into sulphur - producing algae, ancient ice cores, and sea sediments from the North Atlantic region could help climatologists

The new measurements in this research were made with cores that showed the results of massive amounts of sediments released by subsea landslides during a subduction zone earthquake — a catastrophic event beneath the sea as well as on land.

Evidence for approximately contemporaneous global cooling in sediments that do contain YTT glass shards has been found in marine core oxygen isotope records from the South China Sea (3), as have terrestrial carbon isotope and pollen records from Northern India and Bengal (23).

Christina Ravelo led IODP Expedition 323 to the Bering Sea in 2009 and collected sediment cores that preserve records of regional climate and ocean circulation covering the past 1.2 million years.

By studying sediment cores from the deep Pacific near the Philippines, paleoclimatologist Lowell Stott of the University of Southern California in Los Angeles and his colleagues revealed that the temperatures of the deepest seas rose by around 2 degrees Celsius (3.6 degrees Fahrenheit) at least 1,000 years before sea - surface temperatures.

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.

o Ice core and sea - bed sediment measurements show no evidence that changes in CO2 drive world temperatures or climate.

Sediment cores from every major ocean and sea are archived here.

Once Balog learned that tree rings, sea floor sediments, and ice core data were showing that the climate is warming on average, he changed his mind.

http://www.nature.com/nature/journal/v470/n7333/full/nature09751.html Corrected online 14 April 2011 Erratum (April, 2011) ``... results, based on TEX86 sea surface temperature (SST) proxy evidence from a marine sediment core...»

Ice core data from Antarctic from ocean sediments show 8 episodes of very large ice flux — largest 14,600 years ago, meltwater pulse 1a — 1 - 3 meters sea level rise per century for several centuries.

For Fred Singer, a climatologist at the University of Virginia and another co-author, the current warming «trend is simply part of a natural cycle of climate warming and cooling that has been seen in ice cores, deep sea sediments and stalagmites... and published in hundreds of papers in peer reviewed journals.»

In my briefings to the Association of Small Island States in Bali, the 41 Island Nations of the Caribbean, Pacific, and Indian Ocean (and later circulated to all member states), I pointed out that IPCC had seriously and systematically UNDERESTIMATED the extent of climate change, showing that the sensitivity of temperature and sea level to CO2 clearly shown by the past climate record in coral reefs, ice cores, and deep sea sediments is orders of magnitude higher than IPCC's models.

>... there are still ways of discovering the temperatures of past centuries,... tree rings... Core samples from drilling in ice fields... historical reconstruction... coral growth, isotope data from sea floor sediment, and insects, all of which point to a very warm climate in medieval times.

It is far more important to see whether there is a consistency between corals and deep sea sediment and ice cores and models than it is to validate someones spread sheet.

In a 2003 expedition to Indonesia, the researchers collected cores of sediment from the seas where water from the Pacific flows into the Indian Ocean.

This is not necessarily a contradiction to the other data series, because the two sediment cores used are located in the area of the deep outflow of Labrador Sea Water — but this is only one of two deep currents that together make up the southward part of the overturning circulation of the Atlantic, and thus the heat transport to the north.

The sudden onset and ending of the Younger Dryas has been studied in particular detail in the ice core and sediment records on land and in the sea (e.g., Bjoerck et al., 1996), and it might be representative of other Heinrich events.

So if you want to check whether erosion and sediment transport were taking place during the Pliocene, the best bet is to sample the sediments on the sea - floor dating from that time, by drilling through them and taking cores.

Meanwhile the people predicting a return to the ice cover that existed since the Holocene maximum according to sea floor sediment cores have no physical process to account for their assertions of returning ice.

Cores extracted from deep - sea sediment deposits contain evidence of earlier cold periods.

In a core of sediments taken from the sea floor that was once covered by the Larsen A Ice Shelf, researchers led by Dr. Eugene W. Domack, a professor of geology at Hamilton College in Clinton, N.Y., found the tiny fossils of marine algae.

Proxy records of sea level are preserved in a variety of marine and terrestrial settings, such as sediments and organisms in deep ocean cores or once - submerged shorelines, and uplifted fossil reefs.

Together with Erik Thomsen from Aarhus University in Denmark she has studied sediment cores from the sea off north - western Svalbard.

''... worked with two sediment cores they extracted from the seabed of the eastern Norwegian Sea, developing a 1000 - year proxy temperature record «based on measurements of δ18O in Neogloboquadrina pachyderma, a planktonic foraminifer that calcifies at relatively shallow depths within the Atlantic waters of the eastern Norwegian Sea during late summer,» which they compared with the temporal histories of various proxies of concomitant solar activity... This work revealed, as the seven scientists describe it, that «the lowest isotope values (highest temperatures) of the last millennium are seen ~ 1100 - 1300 A.D., during the Medieval Climate Anomaly, and again after ~ 1950 A.D.» In between these two warm intervals, of course, were the colder temperatures of the Little Ice Age, when oscillatory thermal minima occurred at the times of the Dalton, Maunder, Sporer and Wolf solar minima, such that the δ18O proxy record of near - surface water temperature was found to be «robustly and near - synchronously correlated with various proxies of solar variability spanning the last millennium,» with decade - to century - scale temperature variability of 1 to 2 °C magnitude.»

They looked at data from wind - blown dust in sediment cores from the Red Sea, and matched these with records from Chinese stalagmites to confirm a picture of pronounced climate change at the end of each ice age, and calculated that sea levels rose at the rate of 5.5 metres per centuSea, and matched these with records from Chinese stalagmites to confirm a picture of pronounced climate change at the end of each ice age, and calculated that sea levels rose at the rate of 5.5 metres per centusea levels rose at the rate of 5.5 metres per century.

Furthermore, the total amounts of planktic foraminifers are very similar to those determined in Holocene sediments from these two cores (Supplementary Figs. 2 and 3), suggesting similar sea ice conditions during the LIG as during the latest Holocene (present).

Furthermore, this interpretation is in line with high abundances of the ostracode species Acetabulastoma arcticum found in these sediments of Core PS2200 - 5 (Fig. 2a) and Core 96/12 -1 PC from Lomonosov Ridge (see Fig. 1 for location), proposed to be a proxy for a perennial sea ice cover with > 75 % sea ice concentrations (Supplementary Fig. 8) 46.

The near absence of planktic foraminifers in the MIS 6 sediments of these cores (Supplementary Figs. 2 and 3) 56 also supports the interpretation of virtually no surface water productivity due to closed sea ice conditions.

Modern Arctic sea ice concentrations and location of sediments cores discussed in this study.