DOI: 10.1016/j.quascirev.2018.09.022
Scopus记录号: 2-s2.0-85053529125
论文题名: Major increase in winter and spring precipitation during the Little Ice Age in the westerly dominated northern Qinghai-Tibetan Plateau
作者: Zhao J. ; Thomas E.K. ; Yao Y. ; DeAraujo J. ; Huang Y.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 199 起始页码: 30
结束页码: 40
语种: 英语
英文关键词: Alkenone
; Lake Gahai
; Little Ice Age
; Precipitation reconstructions
; Qaidam Basin
Scopus关键词: Glacial geology
; Lakes
; Repair
; Alkenones
; Little Ice Age
; Long chain alkenones
; Northern Tibetan plateaux
; Precipitation reconstruction
; Qaidam basin
; Qinghai-Tibetan plateau
; Spring precipitation
; Ice
; alkenone
; calibration
; data interpretation
; Little Ice Age
; paleosalinity
; paleotemperature
; precipitation assessment
; sedimentation rate
; spring (season)
; surface water
; westerly
; winter
; China
; Gahai Lake
; Qinghai
; Qinghai-Xizang Plateau
英文摘要: There have been numerous attempts to use long-chain alkenones (LCAs) in saline lakes for paleotemperature and paleosalinity reconstructions. However, LCAs in saline lakes are often produced by multiple haptophyte species, which may confound data interpretations. Here we analyzed LCAs in a finely laminated, high sedimentation rate core from the hypersaline Lake Gahai in the northern Qinghai-Tibetan Plateau and compared our results with regional instrumental records. We find that LCA unsaturation ratios display a stepwise jump during the instrumental period, most likely originating from a sudden shift in the dominant alkenone producers. In contrast, the percentage of the C37:4 alkenone (%C37:4) displays strong correlations with spring and combined winter-spring precipitation amount (R2 = 0.83 and R2 = 0.81, respectively). We hypothesize that high winter-spring precipitation leads to greater freshening of lake surface water immediately after spring melting, promoting greater production of LCAs with relatively high %C37:4 values by the early blooming haptophyte species. Extending the instrumental calibration downcore allows us to quantitatively reconstruct regional spring and winter-spring precipitation for the past millennium. We find a major increase in winter-spring precipitation during the Little Ice Age (LIA), especially during the phases of solar minima. Our finding provides novel quantitative support to the previous studies suggesting relatively wet conditions during the LIA in the westerly dominated regions of central Asia and northern Tibetan Plateau and infers a substantial increase in regional winter-spring precipitation should the predicted grand solar minimum in the forthcoming decades become a reality. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112036
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI02912, United States; Department of Geology, University at Buffalo, New York, United States
Recommended Citation:
Zhao J.,Thomas E.K.,Yao Y.,et al. Major increase in winter and spring precipitation during the Little Ice Age in the westerly dominated northern Qinghai-Tibetan Plateau[J]. Quaternary Science Reviews,2018-01-01,199