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DOI10.1016/j.quascirev.2015.01.023
Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau
Guenther, Franziska; Witt, Roman; Schouten, Stefan; Maeusbacher, Roland; Daut, Gerhard; Zhu, Liping; Xu, Baiqing; Yao, Tandong; Gleixner, Gerd
发表日期2015
ISSN0277-3791
卷号112页码:66-77
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, delta D, delta(13)Corg, delta N-15) are applied to reconstruct the environmental and hydrological changes on one of the longest available paleorecords at the Tibetan Plateau. Based on our paleohydrological delta D 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 delta D of n-C-29 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, delta(13)Corg and delta N-15 from the Last Glacial to the Holocene interglacial period. (C) 2015 Elsevier Ltd. All rights reserved.


英文关键词n-Alkanes;GDGTs;Hydrogen isotopes (delta D);delta N-15;delta(13)corg;Indian Ocean Summer Monsoon (IOSM);Temperature;Precipitation;Time lag;Ecological thresholds
语种英语
WOS研究方向Physical Geography ; Geology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号WOS:000351977500006
来源期刊QUATERNARY SCIENCE REVIEWS
来源机构中国科学院青藏高原研究所
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/375
推荐引用方式
GB/T 7714
Guenther, Franziska,Witt, Roman,Schouten, Stefan,et al. Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2015,112:66-77.
APA Guenther, Franziska.,Witt, Roman.,Schouten, Stefan.,Maeusbacher, Roland.,Daut, Gerhard.,...&Gleixner, Gerd.(2015).Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau.QUATERNARY SCIENCE REVIEWS,112,66-77.
MLA Guenther, Franziska,et al."Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau".QUATERNARY SCIENCE REVIEWS 112(2015):66-77.
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