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Glacial freshwater discharge events recorded by authigenic neodymium isotopes in sediments from the Mendeleev Ridge, western Arctic Ocean

Cited 12 time in scopus
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Title
Glacial freshwater discharge events recorded by authigenic neodymium isotopes in sediments from the Mendeleev Ridge, western Arctic Ocean
Other Titles
서북극해 멘델레프 해령의 퇴적층에 기록된 자생 네오디뮴 동위원소 기록에 의한 빙하 융빙수 유입사건
Authors
Huh Youngsook
Yeongcheol Han
Kwangchul Jang
Jens Matthiessen
Andreas Mackensen
Ruediger Stein
Lee, Mi Jung
Subject
Geochemistry & Geophysics
Keywords
143Nd/144Nd; Circulation; Ice-dammed lake; Mendeleev Ridge; Paleoclimate
Issue Date
2013
Publisher
Elsevier
Citation
Huh Youngsook, et al. 2013. "Glacial freshwater discharge events recorded by authigenic neodymium isotopes in sediments from the Mendeleev Ridge, western Arctic Ocean". EARTH AND PLANETARY SCIENCE LETTERS, 369(5): 148-157.
Abstract
ThefreshwaterbudgetoftheArcticOceanisakeycomponentgoverningthedeepwaterformationinthe North Atlanticandtheglobalclimatesystem.Weanalyzedtheisotopiccompositionofneodymium(εNd) in authigenicphasesofmarinesedimentsontheMendeleevRidgeinthewesternArcticOceanspanningan estimatedtimeintervalfrompresenttoabout75kaBP.Thiscontinuousrecordwasusedtoreconstructthe εNd of thepolardeepwater(PDW)andchangesinfreshwatersourcestothePDWthroughtime.Threedeviations in εNd fromalongtermaverageof ? 10.2wereidentified atestimated46? 51,35? 39 and13? 21 kaBP.The estimated46? 51kaBPeventcanbetracedtoburstingofice-dammedlakesaccompanyingthecollapseofthe Barents? KaraIceSheet,whichwouldhavereleasedradiogenicNdtotheeasternArcticOcean.Thecyclonic surfacecirculationintheeasternArcticOceanmusthavebeenstrongerthanatpresentfortheeventtobe recordedontheMendeleevRidge.Forthe35? 39 and13? 21kaBPevents,itislikelythattheLaurentideIce Sheet (LIS)suppliedtheunradiogenicfreshwater.Theconfigurationoftheanticycloniccirculationinthe westernArcticwasprobablysimilartotodayorexpandedeastward.Oursimplemassbalancecalculations suggestthatlargeamountsoffreshwaterwerereleasedbutduetosignificant deepwaterformationwithinthe ArcticOcean,theeffectontheformationofNADWwasprobablyminor.sternArcticOceanspanningan estimatedtimeintervalfrompresenttoabout75kaBP.Thiscontinuousrecordwasusedtoreconstructthe εNd of thepolardeepwater(PDW)andchangesinfreshwatersourcestothePDWthroughtime.Threedeviations in εNd fromalongtermaverageof ? 10.2wereidentified atestimated46? 51,35? 39 and13? 21 kaBP.The estimated46? 51kaBPeventcanbetracedtoburstingofice-dammedlakesaccompanyingthecollapseofthe Barents? KaraIceSheet,whichwouldhavereleasedradiogenicNdtotheeasternArcticOcean.Thecyclonic surfacecirculationintheeasternArcticOceanmusthavebeenstrongerthanatpresentfortheeventtobe recordedontheMendeleevRidge.Forthe35? 39 and13? 21kaBPevents,itislikelythattheLaurentideIce Sheet (LIS)suppliedtheunradiogenicfreshwater.Theconfigurationoftheanticycloniccirculationinthe westernArcticwasprobablysimilartotodayorexpandedeastward.Oursimplemassbalancecalculations suggestthatlargeamountsoffreshwaterwerereleasedbutduetosignificant deepwaterformationwithinthe ArcticOcean,theeffectontheformationofNADWwasprobablyminor.
URI
http://repository.kopri.re.kr/handle/201206/6050
DOI
http://dx.doi.org/10.1016/j.epsl.2013.03.018
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