Sentences with phrase «sea sediment records»

Not exact matches

During Expedition 359, Eberli's team drilled seven holes along the Maldives Archipelago to collect sediments that hold records of past sea level and environmental changes during the Neogene, a geological time period that began 23 million years ago.

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.

The evidence is now clear that far below the sea, and far below the floor of the sea, in sediments all over the world, microbes live to astonishing depths — the record so far is half a mile — and in astonishing numbers.

The ship also tows a long cable behind it to record the acoustic signals that are reflected back by the sediments and bedrock under the sea floor.

Over a five - month period from December 2004 to April 2005, the traps collected samples of sediments and larva while the meters recorded deep - sea current velocities.

In 1991, the IMO adopted guidelines which recommend that ships should avoid taking on ballast in shallow areas and during toxic blooms of marine algae; keep accurate records of where and when ballast is loaded; exchange ballast water at sea, where toxic organisms are rare; and discharge sediments into approved areas at the port of destination («End of the line for deadly stowaways», New Scientist, 24 October 1992).

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).

The team also found DNA from a form of marine alga in 9300 - year - old sediments, though the alga doesn't show up in the fossil record until 2500 years ago, says molecular paleoecologist Marco Coolen of the Woods Hole Oceanographic Institution in Massachusetts and an author of the Black Sea paper.

But «I was awestruck at the abundance and diversity of small animals of deep sea sediments,» Grassle recalled in a greeting he recorded in accepting one of two Japan Prizes announced today.

A University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science - led research team analyzed the sediments of mesophotic coral reefs, deep reef communities living 30 - 150 meters below sea level, to understand how habitat diversity at these deeper depths may be recorded in the sedimentary record.

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.

«We have recovered two new high - resolution paleomagnetic records of the Laschamp Excursion (~ 41,000 calendar years B.P.) from deep - sea sediments of the western North Atlantic Ocean.

See Page 4 - 22, Figure 9: Geomagnetic field intensity level derived from composite volcanic records, not sea floor sediments, for the past 45 kyr.

Evidence from carbon isotope records from both soil carbonates [18]--[20] and biomarkers (n - alkanes) extracted from deep - sea sediments [21] provide clear evidence of a progressive vegetation shift from C3 (∼ trees and shrubs) to C4 (∼ tropical grasses) plants during the Plio - Pleistocene.

Shown is the past history of sea level since the year 1700 from proxy data (sediments, purple) and multiple records from tide gauge measurements.

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.

Constraints on the amplitude of Mid-Pliocene (3.6 - 2.4 Ma) eustatic sea - level fluctuations from the New Zealand shallow - marine sediment record.

Research indicates that the Arctic had substantially less sea ice during this period compared to present Current desert regions of Central Asia were extensively forested due to higher rainfall, and the warm temperate forest belts in China and Japan were extended northwards West African sediments additionally record the «African Humid Period», an interval between 16,000 and 6,000 years ago when Africa was much wetter due to a strengthening of the African monsoon While there do not appear to have been significant temperature changes at most low latitude sites, other climate changes have been reported.

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.

Shanahan and colleagues found more evidence in support of that when they compared sea temperature records with the patterns in their sediment samples and found a strong correlation.

Tremblay, L.B., G.A. Schmidt, S. Pfirman, R. Newton, and P. DeRepentigny, 2015: Is ice - rafted sediment in a North Pole marine record evidence for perennial sea - ice cover?

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.

''... 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.

Xiao, X., Fahl, K., Müller, J. & Stein, R. Sea - ice distribution in the modern Arctic Ocean: biomarker records from Trans - Arctic Ocean surface sediments.

Strong katabatic winds related to the ice sheets (shown tentatively as stippled black arrows), were probably responsible for ice - free polynya - type conditions off the major ice sheets, causing phytoplankton and sea - ice algae productivity recorded in cores PS2138 - 3 and PS2757 - 8 (for the region off the Greenland - Laurentide Ice Sheet no proof from sediment cores are available.

And they should have recalled that at most places in the deep sea, sediments accumulate at only a few centimeters per thousand years, with the churning by burrowing worms blurring any record of change.

Broecker later remarked that the relatively smooth temperature record of oxygen isotopes in deep - sea sediments «tended to lull scientists into concluding that the Earth's climate responds gradually when pushed.»

HS12 uses the oxygen isotope record in ocean sediments Zachos et al. (2008) to estimate past changes of sea level and ocean temperature, and thus obtain a largely empirical estimate of climate sensitivity.

We use the rich climate history of the Cenozoic era in the oxygen isotope record of ocean sediments to explore the relation of climate change with sea level and atmospheric CO2, inferring climate sensitivity empirically.

Sea level from equations (3.3) and (3.4) is shown by the blue curves in figure 2, including comparison (figure 2c) with the Late Pleistocene sea - level record of Rohling et al. [47], which is based on analysis of Red Sea sediments, and comparison (figure 2b) with the sea - level chronology of de Boer et al. [46], which is based on ice sheet modelling with the δ18O data of Zachos et al. [4] as a principal input driving the ice sheet modSea level from equations (3.3) and (3.4) is shown by the blue curves in figure 2, including comparison (figure 2c) with the Late Pleistocene sea - level record of Rohling et al. [47], which is based on analysis of Red Sea sediments, and comparison (figure 2b) with the sea - level chronology of de Boer et al. [46], which is based on ice sheet modelling with the δ18O data of Zachos et al. [4] as a principal input driving the ice sheet modsea - level record of Rohling et al. [47], which is based on analysis of Red Sea sediments, and comparison (figure 2b) with the sea - level chronology of de Boer et al. [46], which is based on ice sheet modelling with the δ18O data of Zachos et al. [4] as a principal input driving the ice sheet modSea sediments, and comparison (figure 2b) with the sea - level chronology of de Boer et al. [46], which is based on ice sheet modelling with the δ18O data of Zachos et al. [4] as a principal input driving the ice sheet modsea - level chronology of de Boer et al. [46], which is based on ice sheet modelling with the δ18O data of Zachos et al. [4] as a principal input driving the ice sheet model.

«We have recovered two new high - resolution paleomagnetic records of the Laschamp Excursion (~ 41,000 calendar years B.P.) from deep - sea sediments of the western North Atlantic Ocean.

As part of the Dead Sea Deep Drill Core Project, Goldstein and other colleagues drilled deep below the lakebed of the Dead Sea in 2010 and 2011 to pull up more than 1,300 feet (400 meters) of sediment in a long column — a record of sediment deposits spanning 200,000 years.