Sentences with phrase «ocean cores»

Their species distribution in ocean cores is often related to past sea surface temperatures.
Here are my comments to Chris Mooney on the article: Chris, The Snyder study uses a selection of ocean cores from the much greater number collected over the past several decades.
The past climates that forced these changes in ice volume and sea level were reconstructed mainly from temperature - sensitive measurements in ocean cores from around the globe, and from ice cores.
Recent observations, ocean core records, and some modelling results indicate that North Atlantic deep - water formation and its associated ocean heat flow fluctuate substantially over time - scales ranging from years to millennia.
Our understanding of Ice Ages is through ocean core samples that show a build - up of H2 18 O in the shells of a certain ocean species that give us a time line of when they occurred.
Major progress in quantitative understanding of climate change has occurred recently by use of the combination of data from high resolution ice cores covering time scales of order several hundred thousand years [48]--[49] and ocean cores for time scales of order one hundred million years [50].
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Figure 1: Global temperature relative to peak Holocene temperature, based on ocean cores.
Chemical analyses of ocean cores show that the Southern Ocean drew down at least that much CO2 millions of years ago during glacial periods.
Marine scientist Andrew Moy at the Antarctic Climate & Ecosystems Cooperative Research Center (ACE) in Hobart, Tasmania, and his Australian colleagues report in Nature Geoscience this week that they made this finding after comparing G. bulloides shells in ocean cores collected along the South Tasman Rise in 1995 with samples from traps collected between 1997 and 2004.
[36][37] Estimates vary for when the last time the Arctic was ice free: 65 million years ago when fossils indicate that plants existed there to as few as 5,500 years ago; ice and ocean cores going back 8000 years to the last warm period or 125,000 during the last intraglacial period.
Kump and his colleagues have tried to circumvent this problem by using Arctic Ocean cores discovered in the collection of a coal company geologist, Malte Jochmann in Norway.
This isotope technique has been used for several decades for measuring land - based erosion, but this is its first application to ocean core samples, said Lee Corbett, a postdoctoral researcher at UVM and co-author with Bierman.
Major progress in quantitative understanding of climate change has occurred recently by use of the combination of data from high resolution ice cores covering time scales of order several hundred thousand years [48]--[49] and ocean cores for time scales of order one hundred million years [50].
12 12 How we get data from the past — Deep ocean cores — Tree rings — Historical documents — Coral cores — Ice cores Reconstructing past climates
This scale factor defines the bias introduced by a particular selection of ocean cores, failure of that distribution to represent a true global average, and various assumptions in converting the proxy data into a temperature change.
Assumptions are required to estimate global surface temperature change from deep ocean changes, but we argue and present evidence that the ocean core record yields a better measure of global mean change than that provided by polar ice cores.
Based on the paleoclimate record from ice and ocean cores, the last warm period in the Arctic peaked about 8,000 years ago, during the so - called Holocene Thermal Maximum.
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