Comparative Late Pleistocene Paleoceanographic Changes in the Mid Latitude Boreal and Austral Western Pacific

Authors: Kawahata, H.1; Ohkushi, K-i.2; Hatakeyama, Y.3

Source: Journal of Oceanography, Volume 55, Number 6, August 2000 , pp. 747-761(15)

Publisher: Springer

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Abstract:

Middle latitudes of the northern and southern hemispheres of the western Pacific are the sensitive areas for the climatic change. We reconstruct the variation in primary productivity to evaluate the shift of the transition zone between the central water mass and cold water in the both hemispheres. In cores S2612 and LH3166, which are located around boreal and austral 35 degree, the mean C_Organic/N atomic ratios are 7.8 and 7.2, respectively. Therefore it is suggested that organic matter is mainly of marine origin (excluding the middle Stage 6 to Stage 7 with the high C_Organic/N atomic ratios in core LH3166). Primary productivities estimated from these cores in the middle latitudes of the western Pacific during the late Pleistocene demonstrate similar profiles. Maxima are observed at late Stage 2, late Stage 4 (middle Stage 4 for L3187) and late Stage 6 while minimum values were observed at Stage 5. Mass accumulation rates of organic carbon and biogenic opal also show similar profiles in these cores. These results and paleontological evidence show that the transition zone between Subtropical and subarctic waters almost synchronously migrated along the latitudinal transection during the last 150 kyr.

Keywords: Late Pleistocene; Lord Howe Rise; Organic carbon; Shatsky Rise; middle latitude; northern and southern hemispheres

Document Type: Regular Paper

Affiliations: 1: Marine Geology Department, Geological Survey of Japan, Higashi, 1-1, Tsukuba, Ibaraki 305-8567, Japan; Graduate School of Science, Tohoku University, Sendai 980-8578, Japan 2: University of Tsukuba, Tennodai, Tsukuba, Ibaraki 305-8571, Japan 3: Kansai Environmental Engineering Center CO. LTD., Azuchi 1-3-5, Chuou-ku, Osaka 541 0052, Japan

Publication date: August 1, 2000

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