Aeolian sediments on the north-eastern Tibetan Plateau
Aeolian sediments on the north-eastern Tibetan Plateau
复制标题
青藏高原东北部的风成沉积物
DOI：
10.1016/j.quascirev.2012.10.001
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发表时间：
2012-11
影响因子：
4
通讯作者：
乌尼曼
中科院分区：
文献类型：
--
作者：
乌尼曼
青藏高原的风成沉积物是古气候信息的重要载体。本研究对青藏高原东北部东吉科纳流域的沉积物进行了详细的分析。长距离和短距离的沉积物搬运导致风成沉积物沉积的复杂模式，这取决于气候变化以及沉积物的可获得性。基于迄今为止青藏高原单个流域最大的光释光测年数据集（51），重建了不同时期的泥沙输运增加。在这一高海拔环境中，风成沉积的增加始于全新世早期，约10.5 ~ 7 ka的砂堆积。黄土沉积物保存时间为10.5 ~ 7.5ka。这两个档案都与亚洲夏季季风的加强有关，其特点是气候更加潮湿和温暖。这种气候变化支持了风成沉积物的捕获。在充分的季风条件下，从约9万年起，河流的过程导致侵蚀的风成档案和崩积沉积物的形成，直到6万年。一个干燥和凉爽的气候导致重新激活的沙丘砂从3万年到现在，可能与更强的人类影响相结合。因此，青藏高原的风成沉积物指示两种不同的气候模式。在全新世早期，潮湿的条件有利于风成沉积物的保留。在全新世晚期，由于植被覆盖的小规模扰动，沉积物重新活化，表明气候较冷和干燥。
Aeolian sediments on the Tibetan Plateau are an important archive of palaeoclimatic information. This study presents a detailed analysis of sediments from the Donggi Cona catchment on the north-eastern part of the Tibetan Plateau. Long- and short-distance sediment transport leads to a complex pattern of aeolian sediment deposition that depends on climatic changes as well as on the availability of sediments. Based on the largest dataset of OSL datings (51) from a single catchment on the Tibetan Plateau so far, different periods of increased sediment transport have been reconstructed. Increased aeolian deposition in this high elevation environment started in the early Holocene with the accumulation of sands from around 10.5 to 7 ka. Loess sediments have been preserved from a period from 10.5 to 7.5 ka. Both archives are related to the strengthening of the Asian summer monsoons characterized by wetter and warmer climate. This change in climate supported the trapping of aeolian sediments. Under full monsoon conditions from around 9 ka onwards fluvial processes resulted in erosion of the aeolian archives and the formation of colluvial sediments until 6 ka. A dry and cooler climate resulted in the reactivation of dune sands from 3 ka to present, possibly in combination with stronger human influence. Aeolian sediments on the Tibetan Plateau therefore indicate two different climatic modes. During the early Holocene wetter conditions were favourable to retain aeolian sediments. The reactivation of sediment in the late Holocene due to small-scale disturbances in the vegetation cover, points to a cooler and drier climate.
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DOI：
10.1111/j.1468-0459.2010.00399.x
发表时间：
2010-01-01
影响因子：
1.5
作者：
Ljungqvist, Fredrik Charpentier
通讯作者：
Ljungqvist, Fredrik Charpentier
DOI：
10.1016/0031-0182(91)90041-o
发表时间：
1991-05-01
影响因子：
3
作者：
LISTER, GS;KELTS, K;NIESSEN, F
通讯作者：
NIESSEN, F
影响因子：
4
作者：
Y. Küster;R. Hetzel;M. Krbetschek;Mingxin Tao
通讯作者：
Y. Küster;R. Hetzel;M. Krbetschek;Mingxin Tao
DOI：
10.3285/eg.57.1-2.5
发表时间：
2008-08
期刊：
EG Quaternary Science Journal
影响因子：
--
作者：
F. Preusser;D. Degering;M. Fuchs;A. Hilgers;A. Kadereit;N. Klasen;M. Krbetschek;D. Richter;
通讯作者：
F. Preusser;D. Degering;M. Fuchs;A. Hilgers;A. Kadereit;N. Klasen;M. Krbetschek;D. Richter;
影响因子：
2.8
作者：
G. Weltje;M. Prins
通讯作者：
G. Weltje;M. Prins