DOI: 10.1016/j.quascirev.2015.01.023
Scopus记录号: 2-s2.0-84922700279
论文题名: Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau
作者: Günther F. ; Witt R. ; Schouten S. ; Mäusbacher R. ; Daut G. ; Zhu L. ; Xu B. ; Yao T. ; Gleixner G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 112 起始页码: 66
结束页码: 77
语种: 英语
英文关键词: Ecological thresholds
; GDGTs
; Hydrogen isotopes (δD)
; Indian Ocean Summer Monsoon (IOSM)
; N-Alkanes
; Precipitation
; Temperature
; Time lag
; δ13Corg
; δ15N
Scopus关键词: Atmospheric thermodynamics
; Ecology
; Ecosystems
; Glacial geology
; Glycerol
; Incident solar radiation
; Isotopes
; Lakes
; Oceanography
; Paraffins
; Precipitation (chemical)
; Solar radiation
; Temperature
; Ecological thresholds
; GDGTs
; Hydrogen isotope
; n-Alkanes
; Summer monsoon
; Time lag
; Aquatic organisms
; environmental change
; geochemistry
; Holocene
; hydrogen isotope
; interglacial
; Last Glacial
; nutrient availability
; paleoecology
; paleohydrology
; vegetation history
; China
; Indian Ocean
; Nam Co
; Xizang
英文摘要: The transition from the Last Glacial to the current Interglacial, the Holocene, represents an important period with climatic and environmental changes impacting ecosystems. In this study, we examined the interplay between the Indian Ocean Summer Monsoon (IOSM) and the Westerlies at lake Nam Co, southern Tibet to understand the climatic effects on the ecosystem. Different organic geochemical proxies (n-alkanes, glycerol dialkyl glycerol tetraethers, δD, δ13Corg, δ15N) are applied to reconstruct the environmental and hydrological changes on one of the longest available paleorecords at the Tibetan Plateau. Based on our paleohydrological δD proxies, the aquatic signal lags the terrestrial one due to specific ecological thresholds, which, in addition to climatic changes, can influence aquatic organisms. The aquatic organisms' response strongly depends on temperature and associated lake size, as well as pH and nutrient availability. Because the terrestrial vegetation reacts faster and more sensitively to changes in the monsoonal and climatic system, the δD of n-C29 and the reconstructed inflow water signal represent an appropriate IOSM proxy. In general, the interplay of the different air masses seems to be primarily controlled by solar insolation. In the Holocene, the high insolation generates a large land-ocean pressure gradient associated with strong monsoonal winds and the strongest IOSM. In the Last Glacial period, however, the weak insolation promoted the Westerlies, thereby increasing their influence at the Tibetan Plateau. Our results help to elucidate the variable IOSM, and they illustrate a remarkable shift in the lake system regarding pH, δ13Corg and δ15N from the Last Glacial to the Holocene interglacial period. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59995
Appears in Collections: 过去全球变化的重建
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作者单位: Max Planck Institute for Biogeochemistry, Jena, Germany; NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, Den Burg, Texel, Netherlands; Faculty of Geosciences, University of Utrecht, Utrecht, Netherlands; Friedrich Schiller University, Jena, Germany; Key Lab. of Tibetan Environment Changes and Land Surface Processes Inst. of Tibetan Plateau Res., Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Günther F.,Witt R.,Schouten S.,et al. Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau[J]. Quaternary Science Reviews,2015-01-01,112