Early Holocene palaeoceanographic and glaciological changes in southeast Greenland.
| Title: | Early Holocene palaeoceanographic and glaciological changes in southeast Greenland. |
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| Authors: | Andresen, Camilla S1 (AUTHOR) csa@geus.dk, Sha, Longbin2 (AUTHOR), Seidenkrantz, Marit-Solveig3 (AUTHOR), Dyke, Laurence M1 (AUTHOR), Jiang, Hui4 (AUTHOR) |
| Source: | Holocene. Jun2022, Vol. 32 Issue 6, p501-514. 14p. |
| Subject Terms: | *SEA ice, *GLACIERS, *SEAWATER salinity, *HOLOCENE Epoch, *WATER temperature, *GREENLAND ice, *WATER currents, *ICE sheets |
| Geographic Terms: | GREENLAND |
| Abstract: | Sediment core ER11-16 from Køge Bugt in Southeast Greenland is used to assess early Holocene palaeoceanographic changes and sediment rafting from icebergs calved from the large outlet glaciers in the area. Diatom analysis reconstructs variability in surface water temperature, salinity and sea-ice concentrations, and benthic foraminiferal assemblages is used to reconstruct subsurface ocean conditions. We report Holocene Thermal Maximum in Southeast Greenland during the early Holocene (at least since onset of the record 9100 cal yr BP) until around 4500 cal yr BP, which contrasts with a delay until the mid-Holocene of the Holocene Thermal Maximum in South and Southwest Greenland. The early Holocene warming in Southeast Greenland was caused by a combination of high solar insolation and a weakened subpolar gyre, both of which served to warm the Irminger Current waters subducting onto the shelf. At the same time, the surface temperature was relatively high and sea-ice cover in the polar surface waters of the East Greenland Current was relatively low. High levels of iceberg rafting occurred in Køge Bugt during the early Holocene, synchronously with these warm oceanic temperatures. This is attributed to an increase in iceberg production from the extensive, but retreating, Greenland Ice Sheet. The warm surface conditions were interrupted by a marked and short-lived increase in sea ice around 8200 years ago, providing the first evidence of this global cold episode in Southeast Greenland. After 4500 cal. yr BP, sea-ice cover increased with an expansion of the East Greenland Current, suppressing the inflow of warmer subsurface Irminger Current water to the Southeast Greenland shelf. We relate this oceanic shift to the decreased Northern Hemisphere summer solar insolation. Multi-centennial variability is observed in the grain size spectrum of iceberg rafted debris; a finding we interpret in the context of palaeoceanographic changes. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Early Holocene palaeoceanographic and glaciological changes in southeast Greenland. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Andresen%2C+Camilla+S%22">Andresen, Camilla S</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> csa@geus.dk</i><br /><searchLink fieldCode="AR" term="%22Sha%2C+Longbin%22">Sha, Longbin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Seidenkrantz%2C+Marit-Solveig%22">Seidenkrantz, Marit-Solveig</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dyke%2C+Laurence+M%22">Dyke, Laurence M</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Hui%22">Jiang, Hui</searchLink><relatesTo>4</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Holocene%22">Holocene</searchLink>. Jun2022, Vol. 32 Issue 6, p501-514. 14p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22SEA+ice%22">SEA ice</searchLink><br />*<searchLink fieldCode="DE" term="%22GLACIERS%22">GLACIERS</searchLink><br />*<searchLink fieldCode="DE" term="%22SEAWATER+salinity%22">SEAWATER salinity</searchLink><br />*<searchLink fieldCode="DE" term="%22HOLOCENE+Epoch%22">HOLOCENE Epoch</searchLink><br />*<searchLink fieldCode="DE" term="%22WATER+temperature%22">WATER temperature</searchLink><br />*<searchLink fieldCode="DE" term="%22GREENLAND+ice%22">GREENLAND ice</searchLink><br />*<searchLink fieldCode="DE" term="%22WATER+currents%22">WATER currents</searchLink><br />*<searchLink fieldCode="DE" term="%22ICE+sheets%22">ICE sheets</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22GREENLAND%22">GREENLAND</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Sediment core ER11-16 from Køge Bugt in Southeast Greenland is used to assess early Holocene palaeoceanographic changes and sediment rafting from icebergs calved from the large outlet glaciers in the area. Diatom analysis reconstructs variability in surface water temperature, salinity and sea-ice concentrations, and benthic foraminiferal assemblages is used to reconstruct subsurface ocean conditions. We report Holocene Thermal Maximum in Southeast Greenland during the early Holocene (at least since onset of the record 9100 cal yr BP) until around 4500 cal yr BP, which contrasts with a delay until the mid-Holocene of the Holocene Thermal Maximum in South and Southwest Greenland. The early Holocene warming in Southeast Greenland was caused by a combination of high solar insolation and a weakened subpolar gyre, both of which served to warm the Irminger Current waters subducting onto the shelf. At the same time, the surface temperature was relatively high and sea-ice cover in the polar surface waters of the East Greenland Current was relatively low. High levels of iceberg rafting occurred in Køge Bugt during the early Holocene, synchronously with these warm oceanic temperatures. This is attributed to an increase in iceberg production from the extensive, but retreating, Greenland Ice Sheet. The warm surface conditions were interrupted by a marked and short-lived increase in sea ice around 8200 years ago, providing the first evidence of this global cold episode in Southeast Greenland. After 4500 cal. yr BP, sea-ice cover increased with an expansion of the East Greenland Current, suppressing the inflow of warmer subsurface Irminger Current water to the Southeast Greenland shelf. We relate this oceanic shift to the decreased Northern Hemisphere summer solar insolation. Multi-centennial variability is observed in the grain size spectrum of iceberg rafted debris; a finding we interpret in the context of palaeoceanographic changes. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Holocene is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1177/09596836221080758 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 501 Subjects: – SubjectFull: GREENLAND Type: general – SubjectFull: SEA ice Type: general – SubjectFull: GLACIERS Type: general – SubjectFull: SEAWATER salinity Type: general – SubjectFull: HOLOCENE Epoch Type: general – SubjectFull: WATER temperature Type: general – SubjectFull: GREENLAND ice Type: general – SubjectFull: WATER currents Type: general – SubjectFull: ICE sheets Type: general Titles: – TitleFull: Early Holocene palaeoceanographic and glaciological changes in southeast Greenland. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Andresen, Camilla S – PersonEntity: Name: NameFull: Sha, Longbin – PersonEntity: Name: NameFull: Seidenkrantz, Marit-Solveig – PersonEntity: Name: NameFull: Dyke, Laurence M – PersonEntity: Name: NameFull: Jiang, Hui IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 09596836 Numbering: – Type: volume Value: 32 – Type: issue Value: 6 Titles: – TitleFull: Holocene Type: main |
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