Annual to Millennial Monsoonal Cyclicity Recorded in Holocene Varved Sediments from the NE Arabian Sea
Annual to Millennial Monsoonal Cyclicity Recorded in Holocene Varved Sediments from the NE Arabian Sea
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阿拉伯海东北部全新世变化沉积物记录的年至千年季风循环
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发表时间：
2006
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影响因子：
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通讯作者：
H. Rolinski
中科院分区：
文献类型：
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作者：
U. V. Rad;Andreas Luckge;W. Berger;H. Rolinski
阿拉伯海是研究印度季风年至千年活动能力的关键区域。在晚全新世，巴基斯坦近海的最低含氧带（OMZ）沉积了层状（纹状）沉积物，这些沉积物可以与我们所有的岩心相关联，并允许进行超高分辨率的古气候研究。纹状计数，经AMS 14 C测年、详细的岩相分析、X射线荧光扫描、通量数据从沉积物捕获器，和一个五年的记录（1993年至1998年）的纹层分析支持我们的解释的纹层的年度特征我们认为，短期强降雨导致洪水事件，导致沉积的浅色层的大陆坡。我们使用了来自巴基斯坦OMZ的高分辨率分层沉积物记录来详细研究晚全新世气候变化。稳定的氧同位素比值和无机地球化学组成-反映了阿拉伯海东北部季风驱动的“水分历史”，在过去5000年中，东北季风增强期间的最大降水量约为3100- 3200 yr B P之后，在3000 yr B P附近开始了一个逐渐的变化，并一直持续到2000 ~ 2200 yr B P，由烯酮衍生的海表温度（SST）和浮游有孔虫的氧同位素有助于重建晚全新世的季风变率。我们还在纹层厚度系列中寻找周期性。通过自相关和标准Founer分析检测到的周期序列表明，检测到的大部分周期性可归因于月球潮汐作用。在圣巴巴拉Basln，这表明这些周期是由外星人强迫的，具有全球重要性。我们的记录也包含了1470-这是众所周知的格陵兰岛冰记录的年周期。
Tbe Arabian Sea is a key area for addressing questions about the annual to millennial vmability of the Indian monsoon Dunng the Late Holocene, laminated (varved) sediments were deposlted in the oxygen minimum zone (OMZ) off Pakistan which can be correlated in all our cores and allow ultra-high-resolution paleoclimate studies Varve-counting, checked by AMS 14 C dating, detailed hthofacies analysis, X-ray fluorescence scanning, flux data from sediment traps, and the lamina-by-lamina analysis of a five-year record (1993-1998) support our interpretation of the annual character of the varves We suggest that short-term heavy rainfall leads to flood events, causing the deposition of light-colored layers on the continental slope. We used a high-resolution laminated sediment record from the OMZ off Pakistan to investigate the Late Holocene climatic change In great detail Three independent proxies - varve thickness, stable oxygen isotope ratios and inorganic geochemival composition- reflect the monsoon-driven "moisture history" in the northeastern Arabian Sea dunng the past 5000 years Maximum precipitation during the enhanced NE monsoon around 3 100-3200 yr B P was followed by the onset of a gradual andification around 3000 yr B P whrch continued until about 2000 to 2200 yr B P Alkenone derived Sea Surface Temperature (SST) and oxygen isotopes of planktonic forarminifera helped to reconstruct the monsoon variability dunng the Late Holocene. We also searched for cyclicity in the series of varve thickness The sequence of cycles detected by autocorrelation and standard Founer analysis indicates that a large proportion of the cyclicity detected can be ascribed to lunar tidal action Similar cycles were detected In the Santa Barbara Basln, suggesting that these cycles are extraterrestrially forced and of global importance Our record also contains evidence for the presence of the 1470-year cycle that is well known from the Greenland ice record.