Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution

HOTRAX core HLY0503-8JPC, Mendeleev Ridge

Ruth E. Adler, Leonid Polyak, Joseph D. Ortiz, Darrell S Kaufman, James E T Channell, Chuang Xuan, Andréa G. Grottoli, Emma Sellén, Kevin A. Crawford

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Sediment core HLY0503-8JPC raised by the HOTRAX'05 expedition from the Mendeleev Ridge was analyzed for multiple lithological, paleontological, and stable-isotopic proxies to reconstruct paleoceanographic conditions in the western Arctic Ocean during the Late Quaternary. The core, extensively sampled in the upper 5 m, reveals pronounced changes in sedimentary environments during the ca. 250 kyr interval encompassing Marine Isotopic Stages (MIS) 1 to 7. An estimated average resolution of 500 yr/sample, at least for the last glacial cycle including the last interglacial, provides more detail than seen in other sedimentary records from the western Arctic Ocean. The age control is provided by 14C and amino acid racemization measurements on planktonic foraminifers and correlations with the stratigraphy developed for the central Lomonosov Ridge and with glacial events at the Eurasian Arctic margin. Cyclic variations in lithology combined with foraminiferal abundance and stable-isotopic composition indicate profound changes in hydrographic and depositional environments between interglacial-type and glacial-type periods apparently reflecting a combination of 100-kyr and precessional time scales. This periodicity is complicated by abrupt iceberg- and/or meltwater-discharge events with variable (Laurentide vs. Eurasian) provenance. The proxy record from the interval identified as the last interglacial (MIS 5e), which may aid in understanding the future state of the Arctic Ocean, indicates low ice conditions and possibly enhanced stratification of the water column.

Original languageEnglish (US)
Pages (from-to)18-29
Number of pages12
JournalGlobal and Planetary Change
Volume68
Issue number1-2
DOIs
StatePublished - Jul 2009
Externally publishedYes

Fingerprint

Last Interglacial
sediment
racemization
iceberg
planktonic foraminifera
Last Glacial
meltwater
interglacial
depositional environment
periodicity
provenance
sediment core
lithology
stratification
isotopic composition
stratigraphy
amino acid
water column
timescale
ice

Keywords

  • Arctic Ocean
  • glaciations
  • last interglacial
  • Late Quaternary
  • Mendeleev Ridge
  • sediment stratigraphy

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

Cite this

Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution : HOTRAX core HLY0503-8JPC, Mendeleev Ridge. / Adler, Ruth E.; Polyak, Leonid; Ortiz, Joseph D.; Kaufman, Darrell S; Channell, James E T; Xuan, Chuang; Grottoli, Andréa G.; Sellén, Emma; Crawford, Kevin A.

In: Global and Planetary Change, Vol. 68, No. 1-2, 07.2009, p. 18-29.

Research output: Contribution to journalArticle

Adler, Ruth E. ; Polyak, Leonid ; Ortiz, Joseph D. ; Kaufman, Darrell S ; Channell, James E T ; Xuan, Chuang ; Grottoli, Andréa G. ; Sellén, Emma ; Crawford, Kevin A. / Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution : HOTRAX core HLY0503-8JPC, Mendeleev Ridge. In: Global and Planetary Change. 2009 ; Vol. 68, No. 1-2. pp. 18-29.
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abstract = "Sediment core HLY0503-8JPC raised by the HOTRAX'05 expedition from the Mendeleev Ridge was analyzed for multiple lithological, paleontological, and stable-isotopic proxies to reconstruct paleoceanographic conditions in the western Arctic Ocean during the Late Quaternary. The core, extensively sampled in the upper 5 m, reveals pronounced changes in sedimentary environments during the ca. 250 kyr interval encompassing Marine Isotopic Stages (MIS) 1 to 7. An estimated average resolution of 500 yr/sample, at least for the last glacial cycle including the last interglacial, provides more detail than seen in other sedimentary records from the western Arctic Ocean. The age control is provided by 14C and amino acid racemization measurements on planktonic foraminifers and correlations with the stratigraphy developed for the central Lomonosov Ridge and with glacial events at the Eurasian Arctic margin. Cyclic variations in lithology combined with foraminiferal abundance and stable-isotopic composition indicate profound changes in hydrographic and depositional environments between interglacial-type and glacial-type periods apparently reflecting a combination of 100-kyr and precessional time scales. This periodicity is complicated by abrupt iceberg- and/or meltwater-discharge events with variable (Laurentide vs. Eurasian) provenance. The proxy record from the interval identified as the last interglacial (MIS 5e), which may aid in understanding the future state of the Arctic Ocean, indicates low ice conditions and possibly enhanced stratification of the water column.",
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AU - Ortiz, Joseph D.

AU - Kaufman, Darrell S

AU - Channell, James E T

AU - Xuan, Chuang

AU - Grottoli, Andréa G.

AU - Sellén, Emma

AU - Crawford, Kevin A.

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