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学科主题: Geography, Physical; Geosciences, Multidisciplinary; Paleontology
题名: Temporal and spatial variability of the oxygen isotopic composition of massive corals from the South China Sea: Influence of the Asian monsoon
作者: Su, RX ; Sun, DH ; Bloemendal, J ; Zhu, ZY
通讯作者: srx@scsio.ac.cn ; dhsun@lzu.edu.cn ; jan@liv.ac.uk
关键词: coral ; stable isotopes ; South China Sea ; Asian monsoon ; sea surface temperature ; sea surface salinity
刊名: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
发表日期: 2006
卷: 240, 期:40606, 页:630-648
收录类别: sci
部门归属: Univ Liverpool, Dept Geog, Liverpool L69 7ZT, Merseyside, England; Lanzhou Univ, Key Lab W Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
项目归属: 海洋地质
摘要: Coral colonies of Porites lutea and P lobata were collected from areas to the east and south offshore of Hainan Island, South China Sea. Oxygen isotope ratios, O-18/O-16, were analyzed along the major axis of growth at a resolution of 25 - 28 samples within an annual band from three colonies, giving data series lengths of 15, 20 and 30 years. Coral delta O-18 correlates well with sea surface temperature (SST) throughout most years, particularly when the Asian winter monsoon prevails over the region. Due to the same seasonal phases of SST and sea surface salinity (SSS), it is estimated that most of the seasonal features of coral delta O-18 are controlled by changes in SST with a significant contribution of SSS. This indicates the importance of temperature, as determined by the Asian winter monsoon, as a control on seasonal coral delta O-18 variations in the South China Sea. Given the fact that annual SSS maxima show minor inter-annual changes, the inter-annual change of annual coral delta O-18 maximum mainly reflects the SST induced by the winter monsoon. While the coral delta O-18 is mainly controlled by SST, deviations of the delta O-18 from SST correlate statistically with sea surface salinity, particularly for summer extreme events when SST reaches its annual maximum with minor inter-annual change. Therefore, we suggest that the inter-annual variation of the annual coral delta O-18 minima is mainly controlled by seawater composition. Seawater composition analysis indicates that its delta O-18 and salinity are simultaneously affected by freshwater inputs primarily from precipitation, which is mainly supplied by the Asian summer monsoon. Thus seasonal alternations of the winter and summer monsoon mainly control the coral delta O-18, thereby allowing reconstruction of these monsoonal variables. The three coral records consistently reveal clear inter-decadal trends in delta O-18 - a gradual increase from 1968 to 1987, and a subsequent decrease from 1987 to 2003. These inter-decadal trends are roughly consistent with salinity changes - but not with temperature and precipitation, suggesting that seawater composition controlled by freshwater inputs from distant source areas, rather than from local precipitation, is responsible for the trends in seawater composition and coral delta O-18 over the last 30 years. Comparison of the three coral records indicates that spatial variations in coral delta O-18 coincide with variations in seawater salinity and local precipitation, but not with temperature. This confirms the dominant role of seawater composition, mainly controlled by monsoonal precipitation, on the spatial variability of coral delta O-18 in the South China Sea. (c) 2006 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000241431200015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4394
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Su, RX; Sun, DH; Bloemendal, J; Zhu, ZY.Temporal and spatial variability of the oxygen isotopic composition of massive corals from the South China Sea: Influence of the Asian monsoon,PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2006,240(40606):630-648
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