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Mathematical modeling of ice in the north-western Greenland and interpretation of deep drilling data at the NEEM camp

Tijdschriftbijdrage - Tijdschriftartikel

Glubokoye bureniye na stantsii NEEM v severo-zapadnoy Grenlandii v 2008-2010 gg. bylo vypolneno glavnym obrazom dlya polucheniya dannykh, otnosyashchikhsya k predposlednemu mezhlednikov'yu (Eemian), imevshemu mesto okolo 115-130 tys. l.n. Dlya pravil'noy interpretatsii izotopnogo ryada na osnove izucheniya kerna l'da neobkhodimo otdelit' v nom «klimaticheskiy» signal ot «neklimaticheskogo». Prisutstviye neklimaticheskikh komponent obuslovleno vliyaniyem kolebaniy vysoty poverkhnosti lednika i advektsiyey l'da iz oblastey, raspolozhennykh vyshe po techeniyu, shirotnym kontrastom v raspredelenii d18O i drugimi prichinami. Razobrat'sya v etom pomogayut metody matematicheskogo modelirovaniya. Dlya rekonstruktsii dinamicheskoy istorii Grenlandskogo lednikovogo shchita na protyazhenii dvukh poslednikh lednikovo-mezhlednikovykh tsiklov ispol'zovalas' trokhmernaya regional'naya model' techeniya l'da v ogranichennoy oblasti v severo-zapadnoy chasti Grenlandii mezhdu stantsiyami NEEM i NGRIP. Vozrast kerna l'da skvazhiny NEEM i koordinaty yego proiskhozhdeniya na poverkhnosti rasschityvalis' metodom obratnogo otslezhivaniya chastits l'da v model'nom pole skorosti. Rezul'taty raschotov pokazyvayut, chto izmerennaya raznitsa mezhdu sovremennym znacheniyem d18O v kerne i znacheniyem, sootvetstvuyushchim maksimumu potepleniya okolo 127 tys. l.n., dolzhna byt' uvelichena na 1,5o/oo. Stratigraficheskiye narusheniya v nizhney chasti kerna sushchestvenno zatrudnyayut interpretatsiyu dannykh bureniya.

Translated in Eglish:

Deep drilling at NEEM station in north- western Greenland in 2008-2010 . was carried out mainly to obtain data relating to the penultimate interglacial (Eemian), occurring approximately 115-130 kyr To correctly interpret the isotopic series based on the study of ice cores is necessary to separate it "climate " signal from the " non-climate ". The presence of non-climatic component due to effects of fluctuations in the height of the surface of the glacier and ice advection from areas upstream , in contrast to the latitudinal distribution of ?18O and other causes. Help to understand this mathematical modeling methods . For the reconstruction of the dynamic history of the Greenland ice sheet over the last two glacial- interglacial cycles used a three-dimensional model of regional ice flow in a bounded region in the northwestern part of Greenland between stations NEEM and NGRIP. Age NEEM ice core hole and the coordinates of its origin on the surface were calculated by tracing back the ice particles in the model velocity field . The calculation results show that the measured difference between the modern ?18O value in the core and the value corresponding to the maximum warming of about 127 kyr , shall be increased by 1,5 o/oo. Stratigraphic disturbances in the bottom of the core significantly complicate the interpretation of drilling data.
Tijdschrift: Lëd i Sneg
ISSN: 2076-6734
Issue: 1
Volume: 53
Pagina's: 16-25
Aantal pagina's: 10
Jaar van publicatie:2013
Trefwoorden:ice flow modelling, ice core interpretation, NEEM ice core, Greenland ice sheet