Sentences with phrase «sea oxygen isotope»
The new sea - level record was then used in combination with existing deep - sea oxygen isotope records from the open ocean, to work out deep - sea temperature changes.
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The team used records of oxygen isotope ratios (which provide a record of ancient water temperature) from microscopic plankton fossils recovered from the Mediterranean Sea, spanning the last 5.3 million years.
El Niño thus leaves its mark on the Quelccaya ice cap as a chemical signature (especially in oxygen isotopes) indicating sea surface temperatures in the equatorial Pacific Ocean over much of the past 1,800 years.
Radiocarbon dating of the charcoal samples provided an age for the shells; measurements of oxygen isotopes found in the clam fossils gave sea surface temperatures every 2 to 4 weeks during the clam's life.
Age is critical because it takes about 200 million years for oxygen isotopes in the seas and crustal rocks to be homogenised by cycling through thermal vents in the ocean floor.
By measuring the oxygen isotopes in the sea ice, the scientists were able to deduce where and when the ice was formed.
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).
Stott and his colleagues used the isotopes of oxygen contained within the remnants of microscopic surface and deep - sea creatures to establish temperatures; they then used a radioactive isotope of carbon to date their age.
The record tells the story of the sudden release of an isotopically light source of carbon, triggering a fast warming in the deep sea of about 5 degrees C. Both the carbon isotope signal and the temperature (inferred from oxygen isotopes) then relaxed back toward their initial values in about 100,000 years.
The scientists examined surveys of the ratio of strontium to calcium content and heavy oxygen isotopes, both are sensitive recorders of sea surface temperatures past and present.
The group highlighted the added value of measuring paired coral strontium / calcium ratios (Sr / Ca) and oxygen isotope ratios (δ18O), two key proxies for sea surface temperature that are often referred to as paleothermometers (δ18O also reflects sea surface salinity).
Matthiessen, J. & Knies, J. Dinoflagellate cyst evidence for warm interglacial conditions at the northern Barents Sea margin during marine oxygen isotope stage 5.
Broecker used changes in oxygen isotopes in deep - sea cores, analyzed by Emliani during 1955 - 1966, to point out the sawtooth nature of glacial cycles — a slow cooling followed by rapid warming.
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.»
Uses a time series of hydrographic and stable oxygen isotope (δ18O) measurements collected at a near - coastal site in Marguerite Bay to quantify the prevalence of meteoric freshwater (glacial melt plus precipitation) separately from sea ice melt
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.
The way plankton absorbed oxygen at a given temperature mattered less than what proportion of each isotope was available in the sea water as ice sheets came and went.
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.
Mid-Pliocene sea level and continental ice volume based on coupled benthic Mg / Ca palaeotemperatures and oxygen isotopes
Analyses of the oxygen isotopes of these fossils suggested very warm temperatures for high latitude seas (~ 65 ° S), probably between 20 °C to 25 °C.
Global, cyclic, decadal, climate patterns can be traced over the past millennium in glacier fluctuations, oxygen isotope ratios in ice cores, sea surface temperatures, and historic observations.
In the 1970s, the first comprehensive analysis of oxygen isotopes in sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitch.
The magnitude of sea - level estimates for the past 100 million years rely heavily on foraminiferal calcite oxygen isotopes (δ18O), which are influenced by temperature, evaporation and precipitation, and diagenesis2.