Late Quaternary sea-surface temperature variations in the southeast Atlantic: A planktic foraminifer faunal record of the past 600 000 yr (IMAGES II MD962085)

Min Te Chen, Yuan Pin Chang, Cheng Chieh Chang, Li Wen Wang, Chung Ho Wang, Ein Fen Yu

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Abstract

A high-resolution (∼4-5cm/kyr) giant piston core record (MD962085) retrieved during an IMAGES II-NAUSICAA cruise from the continental slope of the southeast Atlantic Ocean reveals striking variations in planktonic foraminifer faunal abundances and sea-surface temperatures (SST) during the past 600 000 yr. The location and high-quality sedimentary record of the core provide a good opportunity to assess the variability of the Benguela Current system and associated important features of the ocean-climate system in the southeast Atlantic. The planktonic foraminifer faunal abundances of the core are dominated by three assemblages: (1) Neogloboquadrina pachyderma (right coiling)+Neogloboquadrina dutertrei, (2) Globigerina bulloides, and (3) Globorotalia inflata. The assemblage of N. pachyderma (right coiling)+N. dutertrei shows distinctive abundance changes which are nearly in-phase with glacial-interglacial variations. The high abundances of this assemblage are associated with major glacial conditions, possibly representing low SST/high nutrient level conditions in the southwestern Africa margin. In contrast, the G. bulloides and G. inflata assemblages show greater high-frequency abundance change patterns, which are not parallel to the glacial-interglacial changes. These patterns may indicate rapid oceanic frontal movements from the south, and a rapid change in the intensity of the Benguela upwelling system from the east. A single episode of maximum abundances of a polar water species N. pachyderma (left coiling) occurred in the beginning of stage 9 (∼340-330 kyr). The event of the maximum occurrence of this species shown in this record may indicate instability in the Benguela coastal upwelling, or the Antarctic polar front zone position. A winter season SST estimate using transfer function techniques for this record shows primarily glacial-interglacial variations. The SST is maximal during the transitions from the major glacial to interglacial stages (Terminations I, II, IV, V), and is associated with the abundance maxima of a warm water species indicator Globigerinoides. ruber. Cross-spectral analyses of the SST record and the SPECMAP stack reveal statistically significant concentrations of variance and coherencies in three major orbital frequency bands. The SST precedes changes in the global ice volume in all orbital frequency bands, indicating a dominant southern Hemispheric climate effect over the Benguela Current region in the southeast Atlantic.

Original languageEnglish
Pages (from-to)163-181
Number of pages19
JournalMarine Geology
Volume180
Issue number1-4
DOIs
Publication statusPublished - 2002 Feb 15

Fingerprint

foraminifera
sea surface temperature
interglacial
Temperature
Frequency bands
planktonic foraminifera
upwelling
Water
Ice
polar front
Pistons
climate effect
ocean
Nutrients
Transfer functions
transfer function
warm water
continental slope
ice
nutrient

Keywords

  • Benguela Current
  • Planktic foraminifer
  • Quaternary
  • Sea-surface temperature
  • Southeast Atlantic
  • Transfer function

ASJC Scopus subject areas

  • Oceanography
  • Geology
  • Geochemistry and Petrology

Cite this

Late Quaternary sea-surface temperature variations in the southeast Atlantic : A planktic foraminifer faunal record of the past 600 000 yr (IMAGES II MD962085). / Chen, Min Te; Chang, Yuan Pin; Chang, Cheng Chieh; Wang, Li Wen; Wang, Chung Ho; Yu, Ein Fen.

In: Marine Geology, Vol. 180, No. 1-4, 15.02.2002, p. 163-181.

Research output: Contribution to journalArticle

Chen, Min Te ; Chang, Yuan Pin ; Chang, Cheng Chieh ; Wang, Li Wen ; Wang, Chung Ho ; Yu, Ein Fen. / Late Quaternary sea-surface temperature variations in the southeast Atlantic : A planktic foraminifer faunal record of the past 600 000 yr (IMAGES II MD962085). In: Marine Geology. 2002 ; Vol. 180, No. 1-4. pp. 163-181.
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