@article{oai:nagoya.repo.nii.ac.jp:00011463,
 author = {ワヒュディ and Wahyudi and 大場, 忠道 and Oba, Tadamichi and 南川, 雅男 and Minagawa, Masao and 村山, 雅史 and Murayama, Masafumi and 中村, 俊夫 and Nakamura, Toshio},
 journal = {名古屋大学加速器質量分析計業績報告書},
 month = {Mar},
 note = {浮遊性有孔虫Globigerinoides saccculifer殻のAMS^<14>C年代測定結果及びδ^<18>OカーブからPN-3コア(沖縄トラフ)の最下部は約4万年,SST-4コア(琉球前弧海域)の最下部は約3万年まで達していると判断される。PN-3及びSST-4コアの有機炭素沈積量の測定結果から, 沖縄トラフ及び琉球前弧海域において最終氷期には後氷期に比べ生物生産が高かったと考えられる。海底表面に生息している底生有孔虫 Cibicidoides wuellerstorfi(epifauna)と堆積物の表層付近に生息しているUvigerina peregrina(infauna)の産出量及び両者の殻から測定されたδ^<13>C値の差は有機炭素沈積量と相関しており,このことは,海洋表層の生物生産量と直接反映していると考えられる。以上の結果から,C.wuellerstorfiとU.peregrinaの δ^<13>C値の差は,海洋表層における生物生産の変動を示すインディケーターとして用いることができると示唆された。, The last 42kyr productivity changes in surface water and their effects on benthic foraminifera C. wuellerstorfi (epifaunal species) and U. peregrina (infaunal species) have been in vestigated from cores PN-3 and SST-4. On the basis of our observation, we conclude as the following. 1. The greater food supply during the last glacial period, as a consequence of enhanced organic matter flux from surface water, increased the productions of both U. peregrina and C. wuellerstorfi on sea floor during stages 2 and 3. 2. TOC accumulation rates coincide with the differences in δ^<13>C values between U. peregrina and C. wuellerstorfi, reflected that the greater flux of organic matter reaching the sediment, the more ^<13>C depleted CO_2 was released by organic matter decomposing within sediment. We conclude that the down core changes in δ^<13>C difference between U. peregrina and C. wuellerstorfi in cores PN-3 and SST-4 reflect the variations in organic matter fluxes in the Okinawa Trough and in the Ryukyu Fore Arc region for the last 42kyr. 3. The productivity in surface water (as a food supplier) controlled the abundance of organism lived on the sea floor. Decomposition of organic matter also play a role for controlling carbon isotopic composition of not only sea water ΣCO_2 in the water column but also the pore water ΣCO_2 in the sediment. It is a possibility that this δ^<13>C difference can be utilized as an indicator of the past changes in surface water productivity. These results provide new evidence for paleoceanorgraphic history of the Okinawa Trough and the Ryukyu Fore Arc region., タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1996 (平成8)年度},
 pages = {91--106},
 title = {沖縄トラフ及び琉球前弧海域における有機炭素沈積量と底生有孔虫の応答},
 volume = {8},
 year = {1997}
}