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| 论文编号: |
23 |
| 论文题目: |
Lake evolution and hydroclimate variation at Lake Qinghai (China) over the past 32 ka inferred from ostracods and their stable isotope composition |
| 英文论文题目: |
Lake evolution and hydroclimate variation at Lake Qinghai (China) over the past 32 ka inferred from ostracods and their stable isotope composition |
| 第一作者: |
Li, XZ |
| 英文第一作者: |
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| 联系作者: |
Li Xiangzhong |
| 英文联系作者: |
Li Xiangzhong |
| 外单位作者单位: |
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| 发表年度: |
2017 |
| 卷: |
58 |
| 期: |
3 |
| 页码: |
299-316 |
| 摘要: |
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| 英文摘要: |
We used ostracod species assemblages and their delta O-18 values in a 32-m sediment core from Lake Qinghai, China, along with information from cores collected at other sites in the lake, to infer lake evolution and hydroclimate changes since the last glacial. Dominant ostracod species Ilyocypris bradyi and its low delta O-18 values showed that Lake Qinghai was small in size or even consisted of several playa lakes, and the 1F core site could have even been in a wetland setting, under cold and dry climate conditions before 15.0 ka. Presence of Limnocythere inopinata with low delta O-18 values, and absence of I. bradyi after 15.0 ka, indicate the lake area increased or that the playas merged. The decrease or disappearance of ostracods with high delta O-18 values showed that the lake shrunk under dry climate from 12.0 to 11.6 ka. After 11.6 ka, hydroclimate shifts inferred from ostracod species changes (Eucypris mareotica and L. inopinata) and their delta O-18 values were as follows: (1) 11.6-7.4 kalarger, but still small lake area with greater moisture availability under primarily dry climate conditions, (2) 7.4 to 3.2 ka-increasing lake level under a warmer and wetter climate, and (3) 3.2 ka to present-stable, large, brackish lake. The low ratio of lake water volume to runoff, and close proximity of the core site to freshwater input from the river mouth would have resulted in relatively lower ostracod delta O-18 values when Lake Qinghai was small in area during the interval from 32.0 to 15.0 ka. Lower ostracod delta O-18 values during interstadials and throughout the entire Last Glacial Maximum and early deglacial (ca. 24.0-16.0 ka) were caused by a greater contribution of seasonal meltwater from ice or snow and low incoming precipitation delta O-18 values related to cold climate conditions in the region at that time. |
| 刊物名称: |
JOURNAL OF PALEOLIMNOLOGY |
| 英文刊物名称: |
JOURNAL OF PALEOLIMNOLOGY |
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