Deglacial and Holocene Archaeal Lipid-Inferred Paleohydrology and Paleotemperature History of Lake Qinghai, Northeastern Qinghai–Tibetan Plateau
Deglacial and Holocene Archaeal Lipid-Inferred Paleohydrology and Paleotemperature History of Lake Qinghai, Northeastern Qinghai–Tibetan Plateau
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DOI：
10.1016/j.yqres.2014.10.003
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发表时间：
2015-01
影响因子：
2.3
通讯作者：
Huanye Wang;Hailiang Dong;Chuanlun Zhang;Hongchen Jiang;Zhonghui Liu;Meixun Zhao;Weiguo Liu
中科院分区：
文献类型：
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作者：
Huanye Wang;Hailiang Dong;Chuanlun Zhang;Hongchen Jiang;Zhonghui Liu;Meixun Zhao;Weiguo Liu
我们调查了从青海湖恢复的5.8米长的沉积岩芯中的古生菌脂质的分布，以提取自末次冰消期以来的区域水文气候和温度信号。古水文重建的相对丰度thaumarchaeol（%thaum）和考古和caldarchaeol生态（ACE）指数。由thaum推断的湖平面记录延伸到冰消期，显示出3个时期（11.9-13.0、14.1-14.7和15.1-17.2 cal ka BP）的湖平面相对高于全新世早期的湖平面。ACE记录表明，当湖泊较浅时，有三个时期（10.6-11.2，13.2-13.4和17.4-17.6 cal ka BP）的盐度升高。过滤TEX 86记录的基础上古生菌脂质分布对应于相对较高的湖泊水平，这意味着一定的湖泊规模是需要使用的TEX 86古温度计。在1- 4calkaBP，重建的温度波动显著，与推断的湖平面呈负相关，表明这一时期湖温与水文变化可能存在耦合。我们把这种协方差的重要性，夏季温度在控制这个干旱/半干旱地区的蒸发。此外，我们的研究结果表明，古生物脂类有潜力重建古气候模式的湖泊沉积岩芯，但数据应谨慎解释。
We investigate the distribution of archaeal lipids in a 5.8-m-long sedimentary core recovered from Lake Qinghai to extract regional hydroclimate and temperature signals since the last deglaciation for this important region. The paleohydrology was reconstructed from the relative abundance of thaumarchaeol (%thaum) and the archaeol and caldarchaeol ecometric (ACE) index. The %thaum-inferred lake-level record was extended to deglaciation, showing three periods (11.9–13.0, 14.1–14.7 and 15.1–17.2 cal ka BP) with relatively higher lake levels than those during the early Holocene. The ACE record demonstrates three periods (10.6–11.2, 13.2–13.4 and 17.4–17.6 cal ka BP) of elevated salinity when the lake was shallow. Filtered TEX86 record based on archaeal lipid distributions corresponded to relatively higher lake levels, implying that a certain lake size is required for using the TEX86 paleothermometer. At 1–4 cal ka BP, the reconstructed temperature fluctuated significantly and correlated negatively with inferred lake level, indicating that lake temperature and hydrological change might be coupled during this period. We attribute this co-variance to the importance of summer temperature in controlling evaporation for this arid/semi-arid region. Moreover, our results indicate that archaeal lipids have potential in reconstructing paleoclimate patterns from lacustrine sedimentary cores, but the data should be interpreted with care.