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

Huh Youngsook; Yeongcheol Han; Kwangchul Jang; Jens Matthiessen; Andreas Mackensen; Ruediger Stein; Nam, Seung-il

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

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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
Nam, Seung-il

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.