Extraction of Trace Components from Large Quantities of Ice In Bore Holes

Oeschger, H.; Stauffer, Philip H.; Bucher, P. J. M.; Moëll, Mattias K.

doi:10.1017/s002214300003077x

“…Johnsen et al (1972) were able to show on the basis of measurements that on an undisturbed ice profile of Camp Century (Greenland) dating over Oeschger et al (1976) * Excluding "bomb tritium", i.e. 4-14 and 4-17) permits a much better identification of annual ice layers than is possible by conventional strati graphic methods.…”

Section: Dating Firn and Glacier Icementioning

confidence: 99%

Environmental Isotopes in Ice and Snow

Moser¹,

Stichler²

1980

The Terrestrial Environment, A

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“…(Coachman and others, 1958). This method was further developed and applied on air released from ice melted in bore-holes by Oeschger and others (1976). The time range is 500-25000 years using 5 tons of ice.…”

Section: Fig I Drill Sites In Greenland Crrel Drilled the First Sumentioning

confidence: 99%

“…In the 100-1 000 year time range 32Si and 39Ar, both with half lives close to 300 years, have been applied (Clausen, 1973;Oeschger and others, 1976), but the accuracy cannot cope with that of most of the stratigraphic methods, when applicable.…”

Section: Fig I Drill Sites In Greenland Crrel Drilled the First Sumentioning

confidence: 99%

Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust

Hammer

¹

,

Clausen

²

,

Dansgaard

³

et al. 1978

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ABSTR ACT. The ava ilabl e m e thod s for d a ting of ice cores are based o n radioactive d ecay, ice-fl ow calculati ons, or stratigraphic observa tions. The two form e r ca tegories a re broad ly outlined, a nd special emphas is is given to stratigraphi c method s. R eference horizons are established bac k to A.D. 1783 , in th e form of elevated electri ca l co nduc ti vities due to fa ll out of soluble volcanic d ebris. Seasonal vari a tion ; in the concentrations of insolubl e rni c ropa rticl es a nd /o r s tab le iso topes are m easured over th e e ntire 400 m lengths of three ice cores, recovered by Greenland I ce S h eet Program (G I SP) . The resul ting a bso lute time sca le; are probably accurate with in a few years per thousa nd . T echniqu es a re outlined for re-es ta blishing the a pproximate, origina l sha pe of heavy-isotope profil es that h ave been more o r less sm oo thed by diffusio n in fim and ice. Annual-l ayer thickness m easurements on 24 in crements clown to 1 130 m clepth in th e C a mp Century ice core d etermin e a fl ow pa ttern, consistent with that sugges ted by D a nsgaard and J ohnse n ( 1969), a nd a Camp Century time scale with an es timated un certainty better th a n 3 % b ack to 10000 years D.P.R ESUM E. Datatioll de carolles de glace groell!a . daises par des modelesd'ecolllemellt, les isotopes, les sidimenls volcalliqlles el les pOllssieres cOlltillenlales. L es m ethodes disponibles pour dater d es carottes de g lace sont basees sur I'a ttenuation d e la raclio-acti v ite, sur le calcul d e l'ecoulement d e la g lace ou sur des obse rva tions stratigraphiques. L es d eux premie re categories son t decrites a grands t r a its e t une attentio n particuliere es t ponee a ux m e thodes stratigra phiques . Des horizons d e reference sont e tablis jusqu'en 1783 de notre ere, sous la forme d ' u ne eleva tion d e la conductibilite e lec trique a la sui te d es re tombees d e cendres volca niques solu bles . L es va ri ations sa iso nni eres de conce ntra tion en micro-pa rticl es et/ou en iso topes sta bles sont mesurees sur la to talite des 400 m de longueur d e tro is ca rottes de gl ace ra pportees par I'equipe du Green la nd Ice Shee t Progra m (G JSP ). L es echell es de te mps absolu qui en res ultent sont probable ment prec ises jusqu ' a qu e lqu es a nnees pour mi ll e. On decrit les techn iques utilisees pour reta blir la form e origina le approx imative d es profils d ' iso to pes lourds qu i ont e te plus ou moins li sses pa r la diffusion dans le neve e t la glace. L es m esures d 'e pa isseur d e la couche a nnuell e sur 24 seque n ces a ll a nt jusqu 'a 1 1 3 0 m d 'epaisseur cla ns les ca ro tles cl e glace d e Ca mp Century d e te rmin ent un com porte m e nt de I'ecoul ement coherent avec cd ui sugge re par Dansgaard e t J ohnsen ( 1969 ) et u ne eehelle de temps a Camp Century avec un e in certi tude es timee m e ill e ure que 3 % jusqu ' ::t 10000 a ns a va nt le p resent. Z USAMMENFASSUNG . Dalierung grollldlldischer Bohrkem e millels Fliessmodellen, /solo...

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“…Radioactive isotopes have been used for ice dating purposes since P. F. Scholander 20 years ago used the carbon-dioxide content in air bubbles for 14 C dating (Coachman and others, 1958). This method was further developed and applied on air released from ice melted in bore-holes by Oeschger and others (1976). The time range is 500-25 000 years using 5 tons of ice.…”

Section: Radioactive Decaymentioning

confidence: 99%

Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust

Hammer

¹

,

Clausen

²

,

Dansgaard

³

et al. 1978

View full text Add to dashboard Cite

ABSTR ACT. The ava ilabl e m e thod s for d a ting of ice cores are based o n radioactive d ecay, ice-fl ow calculati ons, or stratigraphic observa tions. The two form e r ca tegories a re broad ly outlined, a nd special emphas is is given to stratigraphi c method s. R eference horizons are established bac k to A.D. 1783 , in th e form of elevated electri ca l co nduc ti vities due to fa ll out of soluble volcanic d ebris. Seasonal vari a tion ; in the concentrations of insolubl e rni c ropa rticl es a nd /o r s tab le iso topes are m easured over th e e ntire 400 m lengths of three ice cores, recovered by Greenland I ce S h eet Program (G I SP) . The resul ting a bso lute time sca le; are probably accurate with in a few years per thousa nd . T echniqu es a re outlined for re-es ta blishing the a pproximate, origina l sha pe of heavy-isotope profil es that h ave been more o r less sm oo thed by diffusio n in fim and ice. Annual-l ayer thickness m easurements on 24 in crements clown to 1 130 m clepth in th e C a mp Century ice core d etermin e a fl ow pa ttern, consistent with that sugges ted by D a nsgaard and J ohnse n ( 1969), a nd a Camp Century time scale with an es timated un certainty better th a n 3 % b ack to 10000 years D.P.R ESUM E. Datatioll de carolles de glace groell!a . daises par des modelesd'ecolllemellt, les isotopes, les sidimenls volcalliqlles el les pOllssieres cOlltillenlales. L es m ethodes disponibles pour dater d es carottes de g lace sont basees sur I'a ttenuation d e la raclio-acti v ite, sur le calcul d e l'ecoulement d e la g lace ou sur des obse rva tions stratigraphiques. L es d eux premie re categories son t decrites a grands t r a its e t une attentio n particuliere es t ponee a ux m e thodes stratigra phiques . Des horizons d e reference sont e tablis jusqu'en 1783 de notre ere, sous la forme d ' u ne eleva tion d e la conductibilite e lec trique a la sui te d es re tombees d e cendres volca niques solu bles . L es va ri ations sa iso nni eres de conce ntra tion en micro-pa rticl es et/ou en iso topes sta bles sont mesurees sur la to talite des 400 m de longueur d e tro is ca rottes de gl ace ra pportees par I'equipe du Green la nd Ice Shee t Progra m (G JSP ). L es echell es de te mps absolu qui en res ultent sont probable ment prec ises jusqu ' a qu e lqu es a nnees pour mi ll e. On decrit les techn iques utilisees pour reta blir la form e origina le approx imative d es profils d ' iso to pes lourds qu i ont e te plus ou moins li sses pa r la diffusion dans le neve e t la glace. L es m esures d 'e pa isseur d e la couche a nnuell e sur 24 seque n ces a ll a nt jusqu 'a 1 1 3 0 m d 'epaisseur cla ns les ca ro tles cl e glace d e Ca mp Century d e te rmin ent un com porte m e nt de I'ecoul ement coherent avec cd ui sugge re par Dansgaard e t J ohnsen ( 1969 ) et u ne eehelle de temps a Camp Century avec un e in certi tude es timee m e ill e ure que 3 % jusqu ' ::t 10000 a ns a va nt le p resent. Z USAMMENFASSUNG . Dalierung grollldlldischer Bohrkem e millels Fliessmodellen, /solo...

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Extraction of Trace Components from Large Quantities of Ice In Bore Holes

Cited by 17 publications

References 4 publications

Environmental Isotopes in Ice and Snow

Environmental Isotopes in Ice and Snow

Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust

Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust

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