| 南海西部晚更新世以来表层海水剩余氧同位素及盐度变化 |
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| 引用本文： | 李丽,王慧,李建如,赵美训,汪品先.南海西部晚更新世以来表层海水剩余氧同位素及盐度变化[J].第四纪研究,2008,28(3):399-406. |
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| 作者姓名： | 李丽 王慧 李建如 赵美训 汪品先 |
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| 作者单位： | 同济大学海洋地质国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金
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同济大学青年优秀人才培养行动基金
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国家重点基础研究发展计划(973计划)
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国家自然科学基金 |
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| 摘 要： | 根据南海西部越南岸外MD05-2901岩芯成对的有孔虫壳体氧同位素和U3k7′-SST计算出过去450ka以来南海西部表层海水氧同位素～δ18Owater和盐度Swater变化记录,二者的变化范围在冰期分别为0.2‰～0.6‰和34.2‰～35.1‰,间冰期分别为-0.6‰～0和32.4‰～33.7‰,表现为冰期高、间冰期低的特征。相反扣除冰盖影响后的剩余氧同位素～δ18Oresid和剩余盐度Sresid,呈现冰期低、间冰期高的特征,在冰期分别平均为-0.5‰和32.7‰,间冰期分别平均为-0.3‰和33.1‰。研究认为该现象主要与赤道太平洋海域冰期纵向的ITCZ平均位置偏南导致的降雨增加有关,同时冰期温度低蒸发弱,间冰期温度高蒸发强以及冰期海平面下降,南海地理格局的改变、河流输入增多等因素也有一定影响。
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| 关 键 词： | 南海 表层海水氧同位素 表层海水盐度 表层海水剩余氧同位素 表层海水剩余盐度 |
| 文章编号： | 1001-7410(2008)03-399-08 |
| 收稿时间： | 2008-02-15 |
| 修稿时间： | 2008年2月15日 |
VARIABILITY OF SEA SURFACE RESIDUAL OXYGEN ISOTOPIC AND SALINITY IN WESTERN SoUTH CHINA SEA OVER LATE PLEISTOCENE |
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| Li Li,Wang Hui,Li Jianru,Zhao Meixun,Wang Pinxian.VARIABILITY OF SEA SURFACE RESIDUAL OXYGEN ISOTOPIC AND SALINITY IN WESTERN SoUTH CHINA SEA OVER LATE PLEISTOCENE[J].Quaternary Sciences,2008,28(3):399-406. |
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| Authors: | Li Li Wang Hui Li Jianru Zhao Meixun Wang Pinxian |
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| Institution: | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092 |
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| Abstract: | Records of δ18O water and S water in surface water of South China Sea over the past 450ka was calculated from paired δ18O of foraminifera and Uk'37-SST in core MD05-2901 off Vietnam.The results showed that δ18O water and S water varied in the range of 0.2 ‰-0.6‰ and 34.2‰-35.1‰ in glacial periods,-0.6‰-0‰ and 32.4‰-33.7‰ in interglacial periods,respectively.But δ18Oresid and Sresid estimated by subtracting the contribution from ice volume exhibited higher value in interglacials,lower value in glacials,averaged in-0.5‰ and 32.7‰ in glacial periods,-0.3‰ and 33.1‰ in interglacial periods,respectively.These may be related with higher precipitation by southern location of ITCZ during glacial periods.Decreasing evaporation by lower temperature,reduced sea level,increasing fluvial input,and geography change in SCS during glacial periods may also reduced the local oxygen isotopic and surface water salinity. |
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| Keywords: | South China Sea sea surface oxygen isotopic sea surface salinity sea surface residual oxygen isotopic sea surface residual salinity |
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