A reexamination of northeast Atlantic sea surface temperature and salinity over the last 16 kyr

Elisabeth Sikes, Lloyd D. Keigwin

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We present a 15 kyr sea surface temperature (SST) record for a high sedimentation rate core (KNR51-29GGC) from the Feni Drift off of Ireland, based on an organic geochemical technique for paleotemperature estimation, U K′ 37 . We compare the U K′ 37 temperature record to planktonic foraminiferal δ 18 O and foraminiferal assemblage SST estimates from the same sample horizons. U K′ 37 gives SST estimates of 13°C for the early deglacial and 18°C for the Holocene and Recent, whereas assemblages give estimates of 9°C and 13°C, respectively. As in nearby core V23-81, we find Ash Zone 1, the Younger Dryas increase in Neogloboquadrina pachyderma sinistral abundance, and maximum abundance of this species during glaciation. N. pachyderma dextral oxygen isotopic analyses have a late glacial to interglacial range of 1.5 ‰. A reduction of about 1‰ in δ 18 O occurred at about 12 ka, whereas U K′ 37 and the foraminiferal fauna indicate a 2°C warming. This implies a 0.9‰ salinity effect on δ 18 O which we attribute to meltwater freshening. All three parameters indicate cooling during the Younger Dryas. UK′ 37 SST estimates show that the major shift from deglacial to interglacial temperatures occurred after the Younger Dryas in termination 1b, in contrast to the assemblage data, which show this jump in SST at the end of the glaciation during termination Ia. Differences between the two SST estimators, which may result from their different (floral versus faunal) sources, are more pronounced between transitions Ia and Ib. This may reflect different habitats under the unusual sea surface conditions of the deglaciation.

Original languageEnglish (US)
Pages (from-to)327-342
Number of pages16
JournalPaleoceanography
Volume11
Issue number3
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

Fingerprint

sea surface salinity
sea surface temperature
Younger Dryas
interglacial
glaciation
paleotemperature
late glacial
deglaciation
meltwater
sedimentation rate
sea surface
ash
warming
temperature
Holocene
fauna
cooling
salinity
oxygen
habitat

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Palaeontology

Cite this

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abstract = "We present a 15 kyr sea surface temperature (SST) record for a high sedimentation rate core (KNR51-29GGC) from the Feni Drift off of Ireland, based on an organic geochemical technique for paleotemperature estimation, U K′ 37 . We compare the U K′ 37 temperature record to planktonic foraminiferal δ 18 O and foraminiferal assemblage SST estimates from the same sample horizons. U K′ 37 gives SST estimates of 13°C for the early deglacial and 18°C for the Holocene and Recent, whereas assemblages give estimates of 9°C and 13°C, respectively. As in nearby core V23-81, we find Ash Zone 1, the Younger Dryas increase in Neogloboquadrina pachyderma sinistral abundance, and maximum abundance of this species during glaciation. N. pachyderma dextral oxygen isotopic analyses have a late glacial to interglacial range of 1.5 ‰. A reduction of about 1‰ in δ 18 O occurred at about 12 ka, whereas U K′ 37 and the foraminiferal fauna indicate a 2°C warming. This implies a 0.9‰ salinity effect on δ 18 O which we attribute to meltwater freshening. All three parameters indicate cooling during the Younger Dryas. UK′ 37 SST estimates show that the major shift from deglacial to interglacial temperatures occurred after the Younger Dryas in termination 1b, in contrast to the assemblage data, which show this jump in SST at the end of the glaciation during termination Ia. Differences between the two SST estimators, which may result from their different (floral versus faunal) sources, are more pronounced between transitions Ia and Ib. This may reflect different habitats under the unusual sea surface conditions of the deglaciation.",
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A reexamination of northeast Atlantic sea surface temperature and salinity over the last 16 kyr. / Sikes, Elisabeth; Keigwin, Lloyd D.

In: Paleoceanography, Vol. 11, No. 3, 01.01.1996, p. 327-342.

Research output: Contribution to journalArticle

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