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標題: | 西太平洋暖池南緣溫躍層二萬五千年來的水文變化 Thermocline variabilities at the southern margin of the western Pacific warm pool during the last 25,000 years |
作者: | Yi-Chi Chen 陳怡綺 |
指導教授: | 魏國彥(Kuo-Yen Wei) |
關鍵字: | 西太平洋暖池,溫躍層,鎂鈣元素比古溫度計,表層垂直水體溫度梯度,冰消期,末次冰盛期, thermoclime,Indo-Pacific Warm Pool,deglaciation,Last Glacial Maximim,Mg/Ca-paleothermometry, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | The temperature and depth of the thermocline are crucial features of the upper water column in the equatorial Pacific because they relate to heat transfer and intermediate water circulation between high- and low-latitudes. To infer changes in thermocline structure of the southwestern equatorial Pacific during the last 25,000 years, we analyzed geochemical proxies of Pulleniatina obiquiloculata (355-425 μm), a thermocline-dwelling planktic foraminifera, from the sediment core MD05-2925 (9°20' S, 151°27' E, water depth: 1642 m) in the Solomon Sea.
Our results suggest that changes in magnitude and timing of the thermal gradient (ΔT) between surface and thermocline waters in western Pacific warm pool differed from that in the East Equatorial Pacific since the Last Glacial Maximim. The depth of thermocline in the Solomon Sea site has been shoaled continuously, probably relates to the increased tilt of thermocline across the equator. The presence of a δ13C minimum at the end of the deglaciation suggests that the thermocline in western equatorial Pacific might have played a role in “ocean tunneling” connecting the high- and low-latitude feedback loop during the Termination I. Our results collaborate with a previous hypothesis that during the deglaciation the 13C-depleted water has increased its production rate in the Southern Ocean and therefore expanded supplying more nutrients to the thermocline waters of the southwest Pacific warm pool. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10273 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 地質科學系 |
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