Examples of using Ice cores in English and their translations into Vietnamese
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The ice cores were gathered from five regions throughout the Arctic Ocean in the spring of 2014 and summer of 2015.
These sudden changes, referred to as Dansgaard-Oeschger events,have been observed in ice cores collected in Greenland.
Greenland and Antarctic ice cores showed evidence of a second eruption in 540 CE, which would have prolonged the misery.
In order to predict future changes in climate,scientists verify and refine their models against paleoclimate data from the ice cores Taylor and others pull up.
Pollen has been observed in the ice cores and can be used to understand which plants were present as the layer formed.
To extend the data farther back in time, Usoskin's team used a physical model to calculate past sunspotnumbers from levels of a radioactive isotope preserved in ice cores taken from Greenland and Antarctica….
The ice cores record large amounts of atmospheric dust during this seven-year period, not all of it originating on Earth.
This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric CO2 has increased since the Industrial Revolution.
The ice cores showed that there was a larger dip in CO2 in 1610, which was caused by the land and not the oceans,” said Alexander Koch, lead author of the study.
For the first time,glaciologists have compared sets of ancient climate records trapped in ice cores from the Andes and the Himalayas to paint a picture of how climate has changed- and is changing- in the tropics.
In the last month, atmospheric levels of carbon dioxide above Antarctica rose past the 400 parts per million(ppm) milestone, contrasting with the pre-industriallevel of 280 ppm recorded in Antarctic ice cores.
We know from air bubbles in ice cores drilled on Antarctica that greenhouse gas concentrations in the Eemian were not dissimilar to preindustrial levels.
While it's true that soil carbonates are only a proxy for ancient climates, the results from the Loess Plateau appear to match other estimates,which were made using ice cores and blue ice records instead.
This is the period when data retrieved from glacial ice cores show the beginning of a growth in the atmospheric concentrations of several'greenhouse gases', in particular C02 and CH4(7).
In the 1994/1995 field season the British Antarctic Survey, Alfred Wegener Institute and the Forschungsstelle für Physikalische Glaziologie of theUniversity of Münster cooperated in a project drilling ice cores on the North and South Domes of the island.[5].
Research using other data, such as tree rings, ice cores and coral formations in the ocean, have shown that the Earth is now the warmest it has been since at least 4,000 years ago.
Concentrations of CO2, methane(CH4) and nitrous oxide(N2O) have increased markedly as a result of human activities since 1750 andnow far exceed pre-industrial values determined from ice cores spanning many thousands of years.
One day, the researchers hope, part of these ice cores will travel all the way down to Antarctica, where a bespoke vault built out of snow will preserve the knowledge it contains for centuries ahead.
Well, scientists can estimate the temperaturechanges at this time by looking at chemicals found in ice cores and marine sediment cores and studying pollen buried in layers deep underground.
The ice cores showed that there was a larger dip in CO2(than usual) in 1610, which was caused by the land and not the oceans,” Alexander Koch, the lead author of the study, told CNN.
To piece together this puzzle, Yale University historian Joseph Manning and his colleagues first compared records of Nile River heights dating back toA.D. 622 with volcanic eruptions recorded in ice cores from Greenland and Antarctica that date back 2,500 years.
Certain isotopes of oxygen and hydrogen in ice cores can determine the temperature in the past while pollen tells us which plant species were present and therefore gives us an indication of climatic conditions suitable for that species.
The stability(to within 0.5‰) of the atmospheric 18O to 16O ratio with respect to sea surface waters since the last interglacial(the last 130 000 years),as derived from ice cores, suggests that terrestrial and marine productivity have varied together during this time period.
Unable to access information on carbon dioxide from ice cores that only date back approximately 800,000 years, the research team used a new method to reconstruct levels of carbon dioxide associated with the temperature spikes within the early Eocene.
For the first time, glaciologists have combined andcompared sets of ancient climate records trapped in ice cores from the South American Andes and the Asian Himalayas to paint a picture of how climate has changed- and is still changing- in the tropics.".
Our new studyused an extensive network of tree rings, ice cores, corals, and sediment records from across Australia and the adjacent Indian and Pacific Oceans to extend rainfall records across all of the major regions of Australia by between 400 and 800 years.
In 2015 the researchers drilled 50 metres into ice that is over 15,000 years old andsampled two ice cores to better understand what microbes were in the atmosphere at the time they became trapped in the glacier, which reflects the climatic and environmental conditions during that period.
In 2008, research on Antarctic Vostok and EPICA Dome C ice cores revealed that methane clathrateswere also present in deep Antarctic ice cores and record a history of atmospheric methane concentrations, dating to 800,000 years ago….
But the evidence is much firmer for the last 800,000 years,when ice cores show that CO2 concentrations stayed tight between 180 and 290 ppm, hovering at around 280 ppm for some 10,000 years before the industrial revolution hit.