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Mathematical modeling of ice flow in Dronning Maud Land, Antarctica, and its application to the Late Quartenary climatic paleoreconstruction

Tijdschriftbijdrage - Tijdschriftartikel

Odin iz osnovnykh istochnikov svedeniy o variatsiyakh temperatury vozdukha v proshlom - fiziko-khimicheskiye svoystva l'da v kernakh, kotoryye poluchayut pri glubokom burenii lednikovykh shchitov. V 2001-2006 gg. na stantsii Konen na Zemle Korolevy Mod v Antarktide v ramkakh proyekta EPICA (European Project for Ice Coring in Antarctica) bylo provedeno glubokoye bureniye i poluchen ledyanoy kern dlinoy 2774 m. Variatsii temperatury vozdukha prakticheski lineyno svyazany s variatsiyami izotopnogo sostava kerna, odnako vosstanovlennyy ryad temperatury , pomimo «klimaticheskogo signala», soderzhit topograficheskuyu sostavlyayushchuyu. Poslednyaya obuslovlena kolebaniyami lokal'noy absolyutnoy vysoty lednikovogo shchita, a takzhe tem obstoyatel'stvom, chto lod v kerne obrazovan iz osadkov, vypadavshikh vdol' trayektoriy dvizheniya chastits l'da. Dlya raschota neklimaticheskogo (topograficheskogo) smeshcheniya v izotopnom i vosstanovlennom po nemu temperaturnom ryadu avtorami stat'i razrabotana metodika, v osnove kotoroy lezhit matematicheskoye modelirovaniye techeniya l'da. Otsenki vozrasta l'da i topograficheskikh popravok v pridonnoy chasti v znachitel'noy stepeni opredelyayutsya potokom geotermicheskogo tepla G. Analiz taloy vody, obnaruzhennoy pri burenii v sloyakh l'da vblizi podstilayushchikh porod, pokazyvayet, chto sredneye po kontinentu (standartnoye) znacheniye G v okrestnostyakh stantsii Konen zanizheno. Dlya ustanovleniya razbrosa otsenok vozrasta l'da i znacheniy neklimaticheskogo smeshcheniya v izotopnom ryadu iz nizhney chasti kerna vypolnena seriya chislennykh eksperimentov, v kotorykh G byla vyshe standartnogo znacheniya na 5-30%.

Translated in English:

One of the main sources of information on variations in temperature in the past - the physico- chemical properties of ice cores , which are obtained by deep drilling of the ice sheets . In 2001-2006 . Kohnen station in Queen Maud Land in Antarctica project EPICA (European Project for Ice Coring in Antarctica) was conducted and received deep drilling ice cores in 2774 m length variations of air temperature is almost linearly related to variations in the isotopic composition of the core , however, restored the range of temperature , in addition to "climate signal " contains topographic component. Last caused by vibrations of the local altitude of the ice sheet , and the fact that the ice formed in the core of the precipitation that falls along the trajectories of ice particles . To calculate the non-climatic ( topographic ) bias in the isotopic and restored it to a temperature range of the authors developed a technique which is based on mathematical modeling of ice flow . Estimates of the age of ice and topographic corrections in the bottom part is largely determined by the geothermal heat flux G. Analysis of meltwater discovered during drilling in the layers of ice near bedrock , shows that the average on the continent (standard ) value of G in the vicinity of Kohnen station underestimated . To determine the age of the scatter count value , and non-climate ice displacement in the isotopic range in the lower portion of the core is made of the numerical series of experiments in which G has the above standard value by 5-30 %.
Tijdschrift: Ice and Snow
ISSN: 2076-6734
Issue: 3
Volume: 52
Pagina's: 5-16
Jaar van publicatie:2012
Trefwoorden:Ice cores, Antarctic ice sheet, Ice sheet modeling
Toegankelijkheid:Open