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- Title
Deglacial and Holocene archaeal lipid-inferred paleohydrology and paleotemperature history of Lake Qinghai, northeastern Qinghai–Tibetan Plateau.
- Authors
Wang, Huanye; Dong, Hailiang; Zhang, Chuanlun L.; Jiang, Hongchen; Liu, Zhonghui; Zhao, Meixun; Liu, Weiguo
- Abstract
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 TEX 86 record based on archaeal lipid distributions corresponded to relatively higher lake levels, implying that a certain lake size is required for using the TEX 86 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.
- Subjects
QINGHAI Sheng (China); TIBETAN Plateau; GLACIAL melting; HOLOCENE Epoch; PALEOHYDROLOGY; ATMOSPHERIC temperature
- Publication
Quaternary Research, 2015, Vol 83, Issue 1, p116
- ISSN
0033-5894
- Publication type
Article
- DOI
10.1016/j.yqres.2014.10.003