本文選題：西太平洋暖池　切入點：南極中層水　出處：《中國科學院研究生院(海洋研究所)》2015年碩士論文　論文類型：學位論文

【摘要】：本論文以西太平洋暖池北部邊緣的MD06-3047B孔為研究材料,該柱狀樣由中法合作執(zhí)行的Marco Polo 2 IMAGES XIV航次取得,該孔位于呂宋島東部的西菲律賓海本哈姆高原,位于17°00.44’N,124°47.93’E,柱長8.9 m,水深2510 m。本次研究利用該柱狀樣來研究西太平洋暖池北部邊緣過去70萬年來的古海洋學變化。通過將底棲種C.wuellerstorfi的δ18O與大洋底棲有孔蟲標準曲線LR04曲線進行對比,并以約出現(xiàn)在距今12萬年的粉紅色G.ruber末現(xiàn)面為參照點建立MD06-3047B孔的年齡模式。結(jié)果顯示MD06-3047B孔共包括17個氧同位素期次,約70萬年。除了G.ruber的δ18O記錄在MIS14-13期冰期間冰期變化特征相對不明顯,底棲種C.wuellerstorfi、次表層種P.obliquiloculata與表層種G.ruber的δ18O記錄整體上具有明顯的冰期間冰期變化特征。底棲有孔蟲C.wuellerstorfi的碳同位素也具有較為明顯的冰期間冰期變化特征,冰期時偏輕,間冰期時偏重;G.ruber的碳同位素變化特征為冰期時逐漸變重,間冰期時逐漸變輕,P.obliquiloculata的碳同位素表現(xiàn)為冰期時逐漸變輕,間冰期時逐漸變重。在冰期終止期Ⅰ、Ⅱ、Ⅳ和Ⅴ期,P.obliquiloculata的δ13C表現(xiàn)出明顯的負偏,而在MIS13期和MIS3期左右,P.obliquiloculata的δ13C表現(xiàn)出明顯的正偏。MD06-3047B孔次表層種P.obliquiloculata與表層種G.ruberδ18O的差值反映的溫躍層變化具有冰期逐漸變淺,間冰期逐漸變深的特點。表層種G.ruber與次表層種P.obliquiloculata的碳同位素記錄,以及底棲種C.wuellerstorfi和表層種P.obliquiloculata的碳同位差值反演的研究區(qū)古生產(chǎn)力變化特征為冰期時升高,間冰期時降低。結(jié)合MD06-3047B孔的差值結(jié)果與西太平洋暖池核心區(qū)ODP805站位和赤道東太平洋ODP847站位的差值對比結(jié)果,得出熱帶太平洋在過去70萬年來存在類ENSO式的變化特征,冰期時為偏類厄爾尼諾狀態(tài),間冰期時為偏類拉尼娜狀態(tài),冰消期時為典型的類厄爾尼諾狀態(tài)。在冰期終止期Ⅰ、Ⅱ、Ⅳ和Ⅴ期,次表層種P.obliquiloculata的碳同位素記錄存在極小值事件,說明在這幾個冰期終止期來自南極的低δ13C海水到達了西太平洋暖池北部邊緣地區(qū)。浮游有孔蟲Mg/Ca反演的表層水和次表層水的溫度,整體趨勢上存在冰期間冰期的變化,冰期間冰期溫度的變化范圍最大達到6℃。
[Abstract]:The MD06-3047B hole on the northern edge of the western Pacific warm Pool was obtained from the Marco Polo 2 IMAGES XIV voyage carried out jointly by China and France. It is located in the Hippenham Plateau of the West Philippines in the eastern part of Luzon Island. The column length is 8.9 m and the water depth is 2510 m. The columnar sample is used to study the paleoceanographic changes in the northern edge of the western Pacific warm pool over the past 700,000 years. The 未 18O of the benthic species C.wuellerstorfi is compared with the standard curve LR04 curve of the oceanic benthic foraminifera by comparing the 未 18O of the benthic species C.wuellerstorfi with the standard curve of the oceanic benthic foraminifera. The age model of MD06-3047B pore was established on the surface of pink G.ruber which appeared about 120,000 years ago. The results show that the MD06-3047B pore consists of 17 oxygen isotope periods. Except for the 未 18O recorded by G.ruber during the MIS14-13 glacial interglacial period, The 未 18O records of the benthic species C.wuellerstorfie, the subsurface species P.obliquiloculata and the surface species G.ruber have obvious characteristics of interglacial variation. The carbon isotopes of the benthic foraminifera C.wuellerstorfi also show obvious characteristics of interglacial variation, and the glacial age is lighter. The carbon isotopic variation of G. ruber during interglacial period is characterized by the gradual weight of glacial period, the gradually lighter carbon isotope of P.obliquiloculata during interglacial period, and the gradual weight of interglacial period during interglacial period. The 未 13C of P.obliquiloculata showed a negative bias, while the 未 13C of P.obliquiloculata in the MIS13 and MIS3 stages showed a significant positive deviation. The difference between the subsurface P.obliquiloculata and G.ruber 未 18O in P.obliquiloculata showed an obvious positive deviation. The variation of thermocline was gradually shallower than that of the G.ruber 未 18O in the subsurface layer of P.obliquooculata, and the variation of 未 13C in P.obliquiloculata was gradually shallower in the glacial period. The carbon isotope records of surface species G.ruber and subsurface species P.obliquiloculata, and the variation of paleoproductivity in the study area by inversion of the carbon isosteric difference between the benthic species C.wuellerstorfi and the surface species P.obliquiloculata are characterized by the increase of glacial age, the characteristics of which are the gradual deepening of the interglacial period. In the interglacial period, the difference between the MD06-3047B hole and the ODP805 station in the central area of the western Pacific warm pool and the ODP847 station in the equatorial eastern Pacific Ocean is compared. It is concluded that the tropical Pacific Ocean has a ENSO like variation in the past 700,000 years. It is a partial El Nino state during the glacial period, a partial La Ni 帽 a-like state in the interglacial period, and a typical El Nino like state during the ice extinction period. At the end of the glacial period I, II, IV and V, the carbon isotope records of the subsurface species P.obliquiloculata have minimal events. The results show that the low 未 13C seawater from the Antarctic reached the northern edge of the western Pacific warm pool during the end of these glacial periods. The temperature of surface water and subsurface water retrieved by planktonic foraminifera (Mg/Ca) shows a variation of interglacial epoch in the whole trend. The temperature range of interglacial epoch is 6 鈩，

本文編號：1647672