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題 名 | Planktonic Foraminiferal Sea Surface Temperature Variations in the Southeast Atlantic Ocean: A High-Resolution Record MD962085 of the Past 400,000 Years from the IMAGES Ⅱ-NAUSICAA Cruise=東南大西洋之浮游有孔蟲海水表面溫度變化:IMAGES 第二航次 (NAUSICAA) 之過去四十萬年高解析度記錄 MD962085 |
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作 者 | 張詠斌; 張正杰; 王麗文; 陳明德; 汪中和; 余英芬; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 10:1 1999.03[民88.03] |
頁 次 | 頁185-200 |
分類號 | 351.936 |
關鍵詞 | 東南大西洋; 浮游有孔蟲; 海水表面; 溫度; Paleoceanography; Late quaternary; Micropaleontology; South Atlantic; |
語 文 | 英文(English) |
英文摘要 | 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 reveal striking variations in plank- tonic foraminifer faunal abundances and sea-surface temperatures (SST) during the past 400,000 years. The location and high-quality sedimentary record of the core provide a good opportunity to assess changes in the in- tensity and position of the Benguela Current System and the Subtropical Convergence, two key features of the ocean-climate system in the south Atlantic. This record can be also used to evaluate the possible influence of Agulhas Current from the throughflow of the Indian Ocean into the South Atlantic. The planktonic foraminifer faunal abundances of the core are dominated by three assemblages: (1) N.pachyderma (right coiling) + N. dutertrei, (2) G. bulloides, and (3) G. inflata. The assemblage of N.pachyderma (right coiling) + N. dutertrei shows distinctive abundance changes which are nearly in-phase with glacial-interglacial variations. 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 assemblages of G. bulloides and G. inflata show more high-frequency abundance change patterns, which are not wellparallel to glacial-interglacial changes. These patterns may indicate rapid oceanic frontal movements from the south, and a rapid change in the inten- sity of Benguela upwelling system from the east. A winter-season SST esti- mate using transfer function techniques for this record shows primarily glacial-interglacial variation5. The SST reaches maxima during the transitions from the major glacial to interglacial stages (Termination., ), and is associated with the abundance maxima of a warm water species indi- cator G. ruber. The relationship shown by the SST and planktonic fora- minifer implies that the SST maxima lead the minima by ap- proximately 3-5 kyr. |
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