Ice Core Dating
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How are ice cores dated? - AntarcticGlaciers .org
Ice Core Dating - TalkOrigins Archive
Ice core dating using stable isotope data - University of . . .
Ice core - Wikipedia
The Dating of Ice Cores - YouTube
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800,000-year Ice-Core Records of Atmospheric Carbon . . .
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www .antarcticglaciers .org › question › how-are-ice-cores-dated
Other ways of dating ice cores include geochemisty, wiggle matching of ice core records to insolation time series (Lemieux-Dudon et al . 2010), layers of volcanic ash (tephra) (Vinther et al ., 2006), electrical conductivity, and using numerical flow models to understand age-depth relationships (Mulvaney et al ., 2012), combined with firn densification modeling to estimate the delta-age (Lemieux-Dudon et al . 2010) . Usually multiple methods are used to improve accuracy .
www .talkorigins .org › faqs › icecores .html
I . Methods of Dating Ice Cores . Of the four distinct methods for determining the ages of ice cores , the first three are direct experimental tests and the fourth rests on somewhat uncertain theories . Counting of Annual Layers The basis of this method lies with looking for items that vary with the seasons in a consistent manner .
Ice core dating using stable isotope data . Ice consists of water molecules made of atoms that come in versions with slightly different mass, so-called isotopes . Variations in the abundance of the heavy isotopes relative to the most common isotopes can be measured and are found to reflect the temperature variations through the year . For ice , the . . .
A difficulty in ice core dating is that gases can diffuse through firn, so the ice at a given depth may be substantially older than the gases trapped in it . As a result, there are two chronologies for a given ice core : one for the ice , and one for the trapped gases .
The Dating of Ice Cores - YouTube . The Dating of Ice Cores . Watch later . Share . Copy link . Info . Shopping . Tap to unmute . If playback doesn't begin shortly, try restarting your device .
Ice Core Dating . The National Science Foundation Ice Core Facility (NSF-ICF) — formerly the National Ice Core Laboratory (NICL) — is a facility for storing, curating, and studying meteoric ice cores recovered from the glaciated regions of the world . Image courtesy of NICL at the University of Denver .
The highest pre-industrial value recorded in 800,000 years of ice-core record was 298 .6 ppmv, in the Vostok core , around 330,000 years ago . Atmospheric CO 2 levels have increased markedly in industrial times; measurements in year 2010 at Cape Grim Tasmania and the South Pole both indicated values of 386 ppmv, and are currently increasing at about 2 ppmv/year .
The claims that layers of ice were formed 160,000 years ago or more come primarily from interpretation of ice cores in Antarctica (Jouzel, et al ., 1987; Barnola, et al ., l987) . The Soviet Antarctic Expeditions at Vostok in East Antarctica recovered an ice core which was almost 7,000 feet long in a region where the total ice thickness is about 12,000 feet (Lorius, et al ., 1979; Lorius, et al ., 1985) .
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Ice Core Dating
