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| 基于尼罗河下游钻孔沉积物粒度端元分析的全新世流域水文气候变化 |
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管静岚1, 赵小双1, Alaa Salem2, Said Shetaia1, 刘演1, 孙千里1, 李茂田1, 陈中原1, 陈静1
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1.华东师范大学河口海岸国家重点实验室;2.Kafrelsheikhl University
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| 摘要: |
| 全新世期间尼罗河流域的水文波动剧烈，深刻影响了古埃及文明的发展。剖析该流域过去的水文气候变化，对现代社会的水资源管理和可持续发展至关重要。基于这一背景，本文对尼罗河下游法尤姆盆地FA-1和三角洲B-1钻孔沉积物粒度进行了端元分析和周期性解析，旨在揭示近一万年来流域水文波动特征及气候驱动机制。研究结果表明，两个钻孔沉积物中分离出的3个粒度端元，分别和尼罗河下游地区流域泥沙输入与风沙相关，其垂向变化指示出尼罗河流域从全新世早-中期的湿润期向晚期干旱气候的转变。针对粒度端元的功率谱分析和小波分析结果表明，在百年尺度上，尼罗河流域全新世水文波动周期主要为~400a、~200a与~150a，与印度洋季风周期较为吻合，印证了印度洋季风对尼罗河流域水文的调控作用；在千年尺度上，尼罗河径流量呈现出与大西洋热盐环流一致的周期，反映出大西洋水汽输送对尼罗河流域水文环境的重要影响。这些发现提供了尼罗河流域全新世水文气候变化的详细记录，探讨了其复杂的驱动机制，为理解尼罗河流域水文气候变化提供了新的视角。 |
| 关键词: 小波分析 气候驱动机制 非洲湿润期 印度洋季风 大西洋热盐环流 |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| HOLOCENE HYDROCLIMATIC CHANGES OF NILE RIVER BASIN HIGHLIGHTZED BY GRAIN SIZE END-MEMBER ANALYSIS OF CORE SEDIMENTS FROM ITS LOWER RIVER BASIN |
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guan jinglan1, zhao xiaoshuang1, Alaa Salem2, Said Shetaia1, liu yan1, sun qianli1, li maotian1, cheng zhongyuan1, cheng jing1
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1.State Key Laboratory of Estuarine and Coastal Science;2.Kafrelsheikhl University
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| Abstract: |
| During the Holocene, the Nile River Basin experienced hydrological fluctuations that had a profound impact on the development of ancient Egyptian civilization. Understanding the paleo-hydroclimatic changes of the river basin is pivotal for the management of water resource and sustainable development of society. In light of this context, this study carried out end-member and periodic analyses of grain size received from sediment core FA-1 in the Faiyum Basin and core B-1 in the delta. The primary objective was to illuminate the hydroclimatic variations and related drivers that have shaped the basin over the past ten millennia. The results reveal that three distinct grain size end members identified in the two cores are linked to sediment deposition and aeolian processes in the lower Nile basin. The vertical variations of the end-members signify a shift from a humid climate in the Early to Mid-Holocene to drier climate in the late Holocene. Power spectral and wavelet analyses indicate that, at a centennial scale, the predominant periodicities of Holocene hydroclimatic fluctuations are approximately ~400, ~200, and 150 years. These align closely with Indian Ocean monsoon cycles, underscoring the monsoon role in governing the hydrology of the Nile River basin. Furthermore, at a millennial scale, the periodicity of the Nile River discharge aligns with the changes in the Atlantic Meridional Overturning Circulation (AMOC), indicating the greater impact of the Atlantic moisture transport on the hydrology of the Nile River Basin. These findings provide a comprehensive chronicle of hydrological shifts in the river basin during the Holocene, delving into the intricate mechanisms that propel the changes, and offering new insights into hydroclimate variations of the Nile River Basin. |
| Key words: Wavelet Analysis Hydroclimatic Mechanisms African Humid Period Indian Ocean Monsoon Atlantic Thermohaline Overturning Circulation |