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首页> 外文学位 >Paleoceanography of the South China Sea and the western equatorial Pacific: Testing linkages between Indonesian Seaway closure and sea level change during the Middle to Late Miocene (∼13--5 Ma).
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Paleoceanography of the South China Sea and the western equatorial Pacific: Testing linkages between Indonesian Seaway closure and sea level change during the Middle to Late Miocene (∼13--5 Ma).

机译：南中国海和赤道西太平洋的古海洋学：测试中新世中晚期（〜13--5 Ma）期间印度尼西亚海道封闭与海平面变化之间的联系。

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摘要

The tectonic opening and closing of ocean gateways played a key role in global climate change during the Cenozoic. Although changes in these gateways affected ocean circulation and heat transport, many of their paleoceanographic effects are still unknown. This dissertation examines the tectonic constriction of the Indonesian Seaway through the middle to late Miocene (i.e., 13.6 to 5.6 Ma) by studying changes in foraminiferal populations and stable isotopes (delta13C and delta18O). The purpose is to better understand the development of the Western Pacific Warm Pool (WPWP) and its interaction with the East Asian monsoon. To study this gateway, three locations are considered: Ocean Drilling Program Site 806 (Ontong Java Plateau, located in the heart of the modern WPWP) and Ocean Drilling Program Sites 1143 and 1146 (southern and northern South China Sea, respectively).; At ∼12.1 Ma, tectonic constriction of the Indonesian Seaway and a succession of sea level falls resulted in the cessation of trans-equatorial Pacific circulation and the initiation of a circulation pattern resembling the modern day. The constriction and sea level falls also resulted in the piling of waters in the western equatorial Pacific (WEP), forming a proto-warm pool. At Ontong Java Plateau the proto-warm pool established La Nina-like conditions, initiated the Equatorial Undercurrent and strengthened the Trade Winds, and sustained productivity in the eastern equatorial Pacific (EEP). The sea level falls also greatly restricted flows through the South China Sea and consequently initiated a proto-warm pool in this basin.; After ∼9.8 Ma, rising sea level weakened the proto-warm pools as an El Nino-like state became established across the Pacific. The shoaling thermocline in the WEP initiated an interval of increased biological productivity while the EEP underwent a "carbonate crash". The "biogenic bloom" in the WEP after ∼9 Ma was due to renewed Northern Component Water production and/or Himalaya-Tibetan Plateau uplift. The bloom was most pronounced after ∼8.5, coincident with plateau uplift and intensification of the Indian/East Asian monsoons. After 6.5 Ma, reestablishment of La Nina-like conditions produced a resurgent proto-warm pool in the WEP and a "biogenic bloom" in the EEP.
机译：海洋通道的构造打开和关闭在新生代期间在全球气候变化中发挥了关键作用。尽管这些通道的变化影响了海洋环流和热传输，但其许多古海洋学影响仍然未知。本文通过研究有孔虫种群和稳定同位素（δ13C和δ18O）的变化，研究了中新世中期至晚期（即13.6至5.6Ma）印度尼西亚海道的构造收缩。目的是更好地了解西太平洋暖池（WPWP）的发展及其与东亚季风的相互作用。为了研究该门户，考虑了三个位置：海洋钻探计划地点806（位于现代WPWP的中心的安通爪哇高原）和海洋钻探计划地点1143和1146（分别是南海和南海）。在大约12.1 Ma时，印度尼西亚海道的构造收缩和一系列海平面下降导致了越赤道太平洋环流的停止和类似于现代的环流模式的开始。收缩和海平面下降还导致了赤道西太平洋（WEP）的水流堆积，形成了一个原始的暖水池。在安东爪哇高原，原始的暖池建立了类似拉尼娜的条件，引发了赤道暗流并增强了贸易风，并维持了赤道东太平洋（EEP）的生产力。海平面下降也极大地限制了南中国海的水流，因此在该盆地形成了一个原始的暖池。约9.8 Ma之后，随着整个太平洋地区建立了类似El Nino的州，海平面上升削弱了原暖池。当EEP发生“碳酸盐崩溃”时，WEP中的浅滩跃层开始了生物生产力提高的时间间隔。约9 Ma之后，WEP中的“生物开花”是由于北部部分水的生产重新开始和/或喜马拉雅山-西藏高原的隆升。约8.5点后，花开最为明显，与印度洋/东亚季风的高原抬升和加剧相吻合。 6.5 Ma之后，类似La Nina的条件的重建在WEP中产生了复兴的原始暖池，在EEP中产生了“生物繁殖”。

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  • 作者

    Nathan, Stephen A.;

  • 作者单位

    University of Massachusetts Amherst.;

  • 授予单位 University of Massachusetts Amherst.;
  • 学科 Geology.; Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 250 p.
  • 总页数 250
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;海洋物理学;
  • 关键词

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