globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.02.022
论文题名:
Moisture-advection feedback supports strong early-to-mid holocene monsoon climate on the eastern tibetan plateau as inferred from a pollen-based reconstruction
作者: Herzschuh U.; Borkowski J.; Schewe J.; Mischke S.; Tian F.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 402
起始页码: 44
结束页码: 54
语种: 英语
英文关键词: Holocene ; Last Glacial Maximum ; Moisture-advection feedback ; Monsoon ; Pollen-climate calibration ; Tibetan Plateau
英文摘要: (Paleo-)climatologists are challenged to identify mechanisms that cause the observed abrupt Holocene monsoon events despite the fact that monsoonal circulation is assumed to be driven by gradual insolation changes. Here we provide proxy and model evidence to show that moisture-advection feedback can lead to a non-linear relationship between sea-surface and continental temperatures and monsoonal precipitation. A pollen record from Lake Ximencuo (Nianbaoyeze Mountains) indicates that vegetation from the eastern margin of the Tibetan Plateau was characterized by alpine deserts and glacial flora after the Last Glacial Maximum (LGM) (21-15.5. cal. kyr BP), by alpine meadows during the Late Glacial (15.5-10.4. cal. kyr BP) and second half of the Holocene (5.0. cal kyr BP to present) and by mixed forests during the first half of the Holocene (10.4-5.0. cal. kyr BP). The application of pollen-based transfer functions yields an abrupt temperature increase at 10.4. cal. kyr BP and a decrease at 5.0. cal. kyr BP of about 3. °C. By applying endmember modeling to grain-size data from the same sediment core we infer that frequent fluvial events (probably originating from high-magnitude precipitation events) were more common in the early and mid Holocene. We assign the inferred exceptional strong monsoonal circulation to the initiation of moisture-advection feedback, a result supported by a simple model that reproduces this feedback pattern over the same time period. © 2014.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69514
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Section, Telegraphenberg A43, 14473 Potsdam, Germany; Potsdam University, Institute for Earth and Environmental Sciences, Karl-Liebknecht-Str. 24-25, 14476 Golm, Potsdam, Germany; Potsdam Institute for Climate Impact Research, Telegrafenberg A62, 14473 Potsdam, Germany; Institute of Geological Sciences, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany

Recommended Citation:
Herzschuh U.,Borkowski J.,Schewe J.,et al. Moisture-advection feedback supports strong early-to-mid holocene monsoon climate on the eastern tibetan plateau as inferred from a pollen-based reconstruction[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,402
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