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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24760

Title: Foraminiferal Oxygen Isotope Stratigraphy and High-Resolution Organic Carbon, Carbonate Records from the Okinawa Trough (IMAGES MD012404 and ODP Site 1202)
沖繩海槽之有孔蟲氧同位素地層與高解析有機碳、碳酸監類記錄(IMAGES MD012404與ODP1202)
Authors: Yuan-Pin Chang;Shiu-Mei Wu;Kuo-Yen Wei;Masafumi Murayama;Hodaka Kawahata;Min-Te Chen
Contributors: NTOU:Institute of Applied Geosciences
Keywords: IMAGES;ODP;Total organic carbon;Calcium carbonate;Okinawa Trough;Paleoceanography;Climate change;East Asian monsoon
Date: 2005-03
Issue Date: 2011-10-20T08:17:36Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: abstract:Biogenic carbonate and organic carbon content of two deep sea cores (MD012404 and ODP site 1202) are measured to reconstruct surface ocean productivity variations in areas of the Okinawa Trough in the Western Pacific where the modern climate is highly sensitive to the East Asian monsoon and precipitation/river runoff. Based on foraminiferal isotope stratigraphy and AMS (superscript 14)C dating, the age models of the cores indicate that core MD012404 shows relatively low sedimentation rates with 50 cm ky^(-1) on average, and that the sedimentation rates in core ODP 1202 are extremely high with an average of 500 cm ky^(-1). Total organic carbon (TOC) and carbonate contents in core ODP 1202 are 0.56% and 6.80% on average, respectively, and are 0.62% and 15.86%, respectively, in core MDO 12404. The relatively high carbonate contents in core MD012404 imply high carbonate productivity in the central Okinawa Trough. The sedimentary composition of core ODP 1202 is composed principally of terrestrial silt and clay, indicating enormous terrestrial flux from land and a carbonate dilution effect in the southern Okinawa Trough. The variations of TOC in core MD012404 reveal a dominant 23 kyr cycle, suggesting that the surface ocean productivity in the Okinawa Trough area appears to be driven by precession changes in the East Asian monsoon. High-frequency oscillations in the TOC records in core MD012404 also indicate that the surface ocean productivity changes share a similar structure with the climatic variability characteristic of northern high latitudes.
Relation: 16(1), pp.57-73
URI: http://ntour.ntou.edu.tw/handle/987654321/24760
Appears in Collections:[應用地球科學研究所] 期刊論文

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