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首页> 外文期刊>Journal of oceanography >Indian summer monsoon variability during the holocene as recorded in sediments of the Arabian Sea: Timing and implications
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Indian summer monsoon variability during the holocene as recorded in sediments of the Arabian Sea: Timing and implications

机译：记录在阿拉伯海沉积物中全新世期间印度夏季风的变化：时间和意义

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Indian monsoon precipitation fluctuated significantly during the Holocene and a reliable reconstruction of the timing of the events and their implications is of great benefit to our understanding of the effect and response of low latitude climate systems to the forcing factors. We have carried out high-resolution terrigenous proxy studies on a laminated sediment core from the Oxygen Minimum Zone of the eastern Arabian Sea margin to reconstruct the summer monsoon-controlled precipitation changes during the Holocene. The temporal variation in the terrigenous proxy indicators of this core, in combination with other high-quality cores from the Arabian Sea, suggests several abrupt events in monsoon precipitation throughout the Holocene. The early Holocene monsoon intensification occurred in two abrupt steps at 9500 and 9100 years BP and weakened gradually thereafter, starting at 8500 years BP. A weakening in precipitation recorded at ～7000 years BP, synchronous with similar conditions in India. One of the most significant weak monsoon periods recorded in our studies lies between 6000 and 5500 years BP. Spectral analysis of the precipitation records reveals statistically significant periodicities at 2200, 1350, 950, 750, 470, 320, 220, 156, 126, 113, 104 and 92 years. Most of these millennial-to-centennial cycles exist in various monsoon records as well as the tree ring Δ14C data and/or other solar proxy records. We suggest that throughout the Holocene, externally, small changes in solar activity controlled the Indian monsoon to a large extent, whereas internally, non-solar causes could have influenced the amplitude of decadal-to-centennial oscillations.
机译：在全新世期间，印度季风降水波动很大，对事件时间及其影响的可靠重建对我们了解低纬度气候系统对强迫因素的影响和响应有很大帮助。我们对阿拉伯海东部边缘的氧气最低带的层状沉积岩心进行了高分辨率陆源代孕研究，以重建全新世夏季季风控制的降水变化。该岩心的陆源代用品指标的时间变化，再加上阿拉伯海的其他高质量岩心，表明整个全新世季风降水发生了几次突变事件。全新世季风的早期强化发生在9500和9100年BP的两个突变步骤中，此后从8500年BP开始逐渐减弱。大约7000年BP记录的降水减弱，与印度的类似情况同步。我们的研究中记录到的最重要的弱季风时期之一是在BP的6000年至5500年之间。降水记录的频谱分析揭示了在2200、1350、950、750、470、320、220、156、126、113、104和92年的统计上显着的周期性。这些千禧至百年周期中的大多数存在于各种季风记录以及树环Δ14C数据和/或其他太阳代用记录中。我们建议在整个全新世，从外部看，太阳活动的微小变化在很大程度上控制了印度季风，而在内部，非太阳系的原因可能已经影响了年代际到百年振荡的幅度。

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