A Holocene sedimentary record from Bosten Lake, China
A Holocene sedimentary record from Bosten Lake, China
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DOI：
10.1016/j.palaeo.2005.10.016
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
B. Wünnemann;S. Mischke;Fahu Chen
中科院分区：
文献类型：
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作者：
B. Wünnemann;S. Mischke;Fahu Chen
中国西北部博斯腾湖开都河三角洲边缘的9.24m沉积物记录，为8600年来博斯腾湖水量平衡的变化提供了证据。碎屑组分、自生方解石、总有机碳和锶/钙摩尔比的定量和定性分析以及与所选介形虫组合的对比表明，湖平面在最小5-6m处的波动显示了有效水分供应的变化，主要受西风系统的驱动。水分负平衡的不同时期和干旱状况被确定为8.5-8.1、7.3-7.1、约6.0、5.4-5.0、4.6-4.3、3.9-3.6、3.4-3.2、2.6-2.5、1.9-1.1、0.5-0.3和0.18-0.05卡。Ky BP，与全新世气候变化的区域和全球格局相匹配。在全新世中期，湿气有效性的时间变化也被识别出来，并可能归因于地区不同的气流条件。过去150年来，由于人类影响的增加，湖泊水位的上升伴随着严重的富营养化。
A 9.24 m long sediment record from the Kaidu River delta margin of Bosten Lake, northwestern China, provides evidence for changes in water balance of the lake during the past 8600 calendar years. Quantitative and qualitative analyses of detrital components, authigenic calcite, TOC and Sr/Ca molar ratios as well as comparisons with selected ostracod assemblages show that lake level fluctuations at minimum 5–6 m display changes in effective moisture supply, mainly driven by the west wind system. Distinct periods of negative water balances and thus dry conditions are dated to 8.5–8.1, 7.3–7.1, around 6.0, at 5.4–5.0, 4.6–4.3, 3.9–3.6, 3.4–3.2, 2.6–2.5, 1.9–1.1, 0.5–0.3 and 0.18–0.05 cal. ky BP and match the regional and global pattern of climate shifts during the Holocene. Temporal shifts of moisture availability during mid-Holocene time were recognised as well and may be attributed to regionally different airflow conditions. The last 150 years of rising lake levels are accompanied by strong eutrophication as a result of increased human impact.