Changes in hydrological conditions in the central Qing-Zang (Tibetan) Plateau inferred from lake bottom sediments
Changes in hydrological conditions in the central Qing-Zang (Tibetan) Plateau inferred from lake bottom sediments
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DOI：
10.1016/0012-821x(95)00136-z
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发表时间：
1995-10
影响因子：
5.3
通讯作者：
K. Kashiwaya;T. Masuzawa;H. Morinaga;K. Yaskawa;Y. Baoyin;Liu Jiaqi;Gu Zhaoyan
中科院分区：
文献类型：
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作者：
K. Kashiwaya;T. Masuzawa;H. Morinaga;K. Yaskawa;Y. Baoyin;Liu Jiaqi;Gu Zhaoyan
末次冰期后期湖泊面积小，水位低。此后，由于融水和降雨，湖泊变得更大，水位也更高。这种水文环境一直持续到公元前4000年，大约在这个时候，湖泊的水位急剧下降，湖泊面积缩小。经过短时间的低水位和干旱后，水位明显上升，但没有达到之前的高位。在短暂的大水量流入后，大约在3500年B.P.，气候再次变得干旱，这一间隔的变化与全球变化密切相关。对近13000年水生条件下保存的海底沉积物颗粒成分数据集的统计分析表明，在这一区间内，大多数颗粒大小和化学参数数据集具有2000-2200年的共同周期。
Grain particle and chemical analyses of core samples obtained from Siling-co, a lake on the central Tibetan Plateau, and a sedimentation model for the lake with14C dating show fluctuations in the hydrological environment of the area during the past 15,000 yr. The area of the lake was small and the water level low in the late part of the last glacial period. Thereafter, the lake became larger and the water level high because of meltwater and rainfall. This hydrological environment continued until 4000 yr B.P., at about which time the level of the lake fell sharply and the lake area shrank. After a short period of low level and aridity, the water level increased markedly but did not reach the previous high level. After the large water inflow for a short period, the climate became again arid at about 3500 yr B.P. The change in this interval is closely related to global change. Statistical analyses of the datasets of the grain particle components of bottom sediments preserved in an aquatic condition over the past 13,000 yr show that most datasets for grain size and chemical parameters had a common period of 2000–2200 yr during this interval.