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首页> 外文期刊>Journal of Asian earth sciences >Linkages between Quaternary climate change and sedimentary processes in Hala Lake, northern Tibetan Plateau, China
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Linkages between Quaternary climate change and sedimentary processes in Hala Lake, northern Tibetan Plateau, China

机译：青藏高原北部哈拉湖第四纪气候变化与沉积过程的联系

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摘要

Profundal lake sediment cores are often interpreted in line with diverse and detailed sedimentological processes to infer paleoenvironmental conditions. The effects of frozen lake surfaces on terrigenous sediment deposition and how climate changes on the Tibetan Plateau are reflected in these lakes, however, is seldom discussed. A lake sediment core from Hala Lake (590 km(2)), northeastern Tibetan Plateau spanning the time interval from the Last Glacial Maximum to the present was investigated using high-resolution grain-size composition of lacustrine deposits. Seismic analysis along a north-south profile across the lake was used to infer the sedimentary setting within the lake basin. Periods of freezing and melting processes on the lake surface were identified by MODIS (MOD10A1) satellite data. End-member modeling of the grain size distribution allowed the discrimination between lacustrine, eolian and fluvial sediments. The dominant clay sedimentation (slack water type) during the global Last Glacial Maximum (LGM) reflects ice interceptions in long cold periods, in contrast to abundant eolian input during abrupt cold events. Therefore, fluvial and slack water sedimentation processes can indicate changes in the local paleoclimate during periods of the lake being frozen, when eolian input was minor. Inferred warm (i.e., similar to 22.7 and 19.5 cal. ka BP) and cold (i.e., similar to 11-9 and 3-1.5 cal. ka BP) spells have significant environmental impacts, not only in the regional realm, but they are also coherent with global-scale climate events. The eolian input generally follows the trend of the mid-latitude westerly wind dynamics in winter, contributing medium-sized sand to the lake center, deposited within the ice cover during icing and melting phases. Enhanced input was dominant during the Younger Dryas, Heinrich Event 1 and at around 8.2 ka, equivalent to the well-known events of the North Atlantic realm. (C) 2015 Elsevier Ltd. All rights reserved.
机译：通常根据不同而详细的沉积学过程来解释湖底沉积物的核心，以推断古环境条件。然而，很少讨论冻融的湖面对陆源沉积物沉积的影响以及这些湖如何反映青藏高原的气候变化。使用高分辨率粒度组成的湖相沉积物，研究了青藏高原东北部哈拉湖（590 km（2））的湖泊沉积物芯，其跨度为从最后一次冰川最大值到现在的时间间隔。沿湖南北剖面的地震分析被用来推断湖盆内的沉积环境。利用MODIS（MOD10A1）卫星数据确定了湖面的冻结和融化过程的时期。最终成员对粒度分布的建模可以区分湖相，风成和河流沉积物。在全球最后一次冰期最大值（LGM）期间，主要的粘土沉积（松弛水类型）反映了在长时间的寒冷时期拦截了冰块，与在突然的寒冷事件中大量的风积物形成对比。因此，在风沙输入较少的情况下，河流被冻结和水流松弛的过程可能表明在湖被冻结期间局部古气候发生了变化。推断的温暖（即类似于22.7和19.5 cal ka BP）和寒冷（即类似于11-9和3-1.5 cal。BP）不仅对区域范围有重大的环境影响，而且还与全球气候事件保持一致。风积输入通常遵循冬季中纬度西风动态的趋势，在结冰和融化阶段向湖心贡献中型砂，沉积在冰盖内。在Younger Dryas，Heinrich事件1和大约8.2 ka期间，增强的输入是主要的，相当于北大西洋领域的著名事件。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|140-150|共11页
  • 作者

    Wang Rong; Zhang Yongzhan; Wuennemann Bernd; Biskaborn Boris K.; Yin He; Xia Fei; Zhou Lianfu; Diekmann Bernhard;

  • 作者单位

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-14473 Potsdam, Germany|Univ Potsdam, Dept Geosci, D-14476 Golm, Germany;

    Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210093, Jiangsu, Peoples R China|Nanjing Univ, Minist Educ, Key Lab Coast & Isl Dev, Nanjing 210093, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210093, Jiangsu, Peoples R China|Free Univ Berlin, Inst Geog Sci, D-12249 Berlin, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-14473 Potsdam, Germany;

    Humboldt Univ, Dept Geog, D-10099 Berlin, Germany;

    Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210093, Jiangsu, Peoples R China|Nanjing Univ, Minist Educ, Key Lab Coast & Isl Dev, Nanjing 210093, Jiangsu, Peoples R China|Jiangsu Second Normal Univ, Sch Urban & Resource Environm, Nanjing 210013, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210093, Jiangsu, Peoples R China|Nanjing Univ, Minist Educ, Key Lab Coast & Isl Dev, Nanjing 210093, Jiangsu, Peoples R China;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-14473 Potsdam, Germany;

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  • 正文语种 eng
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  • 关键词

    Tibetan Plateau; Lake deposits; End-member modeling; Grain size; Pleistocene and Holocene climate;

    机译：青藏高原;湖床沉积;末段建模;粒度;更新世和全新世气候;

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