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首页> 外文期刊>Paleoceanography >Orbitally paced paleoproductivity variations in the Timor Sea and Indonesian Throughflow variability during the last 460 kyr
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Orbitally paced paleoproductivity variations in the Timor Sea and Indonesian Throughflow variability during the last 460 kyr

机译：最近460年来帝汶海轨道上的古生产力变化和印尼通流变化。

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摘要

A high-resolution (similar to 1-2 kyr) multiproxy record from the Timor Sea in the easternmost Indian Ocean (International Marine Global Change (IMAGES) Program Core MD01-2378, latitude 13 degrees 04.95'S, longitude 121 degrees 47.27'E, 1783 m water depth) closely tracks changes in intermediate water ventilation and paleoproductivity over the last 460 kyr within one of the main outflow passages of the Indonesian Throughflow. Spectral analysis of five different flux-based productivity proxies indicates spectral power concentrated in the 100 kyr (glacial-interglacial) and the 23 kyr and 19 kyr (precessional) periods. Paleoproductivity maxima lead ice volume (benthic delta(18)O) maxima by 20 degrees to 40 degrees (similar to 1300 to 2600 years) at the precession band. The spectral differences in tropical paleoproductivity records from the Pacific and Indian oceans suggest that local processes (wind and circulation patterns driven by insolation) are dominant in driving productivity rather than large-scale tropical features. In the Timor Sea, productivity fluctuations over the last 460 kyr were strongly influenced by monsoonal wind patterns offshore NW Australia (23 and 19 kyr) and were also modulated by sea level-related variations in the intensity of the Indonesian Throughflow (100 kyr).
机译：来自印度洋最东端帝汶海（国际海洋全球变化（IMAGES）计划核心MD01-2378）的高分辨率（类似于1-2 kyr）多代理记录，纬度13度04.95'，经度121度47.27'E ，1783 m水深）紧密跟踪印度尼西亚通流的其中一条主要出水通道内最后460年间的中间水通风和古生产力的变化。对五个不同的基于通量的生产力代理进行的光谱分析表明，光谱功率集中在100 kyr（冰间期），23 kyr和19 kyr（进阶）期间。在进动带，古生产力的最大铅冰量（底栖delta（18）O）最大为20度至40度（类似于1300至2600年）。来自太平洋和印度洋的热带古生产力记录的光谱差异表明，局部过程（日射驱动的风和环流模式）是驱动生产力的主要因素，而不是大规模的热带特征。在帝汶海，过去460年来的生产率波动受到澳大利亚西北西北风（23和19千瓦）季风风的强烈影响，并且也受到印度尼西亚通流强度（100千瓦）与海平面有关的变化的影响。

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