globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.12.001
Scopus记录号: 2-s2.0-85007521218
论文题名:
TITLE: An early onset of ENSO influence in the extra-tropics of the southwest Pacific inferred from a 14, 600 year high resolution multi-proxy record from Paddy's Lake, northwest Tasmania
作者: Beck K.K.; Fletcher M.-S.; Gadd P.S.; Heijnis H.; Jacobsen G.E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 157
起始页码: 164
结束页码: 175
语种: 英语
英文关键词: Australia ; El Nino Southern Oscillation (ENSO) ; Fire ; Geochemistry ; Palaeoecology ; Pollen ; South-west Pacific ; Tasmania
Scopus关键词: Atmospheric pressure ; Catchments ; Charcoal ; Fires ; Geochemistry ; Lakes ; Nickel ; Tropics ; Vegetation ; Australia ; El Nino southern oscillation ; Palaeoecology ; Pollen ; Tasmania ; West pacific ; Climatology
英文摘要: Tropical El Niño Southern Oscillation (ENSO) is an important influence on natural systems and cultural change across the Pacific Ocean basin. El Niño events result in negative moisture anomalies in the southwest Pacific and are implicated in droughts and catastrophic wildfires across eastern Australia. An amplification of tropical El Niño activity is reported in the east Pacific after ca. 6.7 ka; however, proxy data for ENSO-driven environmental change in Australia suggest an initial influence only after ca. 5 ka. Here, we reconstruct changes in vegetation, fire activity and catchment dynamics (e.g. erosion) over the last 14.6 ka from part of the southwest Pacific in which ENSO is the main control of interannual hydroclimatic variability: Paddy's Lake, in northwest Tasmania (1065 masl), Australia. Our multi-proxy approach includes analyses of charcoal, pollen, geochemistry and radioactive isotopes. Our results reveal a high sensitivity of the local and regional vegetation to climatic change, with an increase of non-arboreal pollen between ca. 14.6–13.3 ka synchronous with the Antarctic Cold Reversal, and a sensitivity of the local vegetation and fire activity to ENSO variability recorded in the tropical east Pacific through the Holocene. We detect local-scale shifts in vegetation, fire and sediment geochemistry at ca. 6.3, 4.8 and 3.4 ka, simultaneous with increases in El Niño activity in the tropical Pacific. Finally, we observe a fire-driven shift in vegetation from a pyrophobic association dominated by rainforest elements to a pyrogenic association dominated by sclerophyllous taxa following a prolonged (>1 ka) phase of tropical ENSO-amplification and a major local fire event at ca. 3.4 ka. Our results reveal the following key insights: (1) that ENSO has been a persistent modulator of southwest Pacific climate and fire activity through the Holocene; (2) that the climate of northwest Tasmania is sensitive to long-term shifts in tropical ENSO variability; and (3) that there has been possible stationarity in the spatial influence of ENSO over this region through the Holocene. © 2016 Elsevier Ltd
资助项目: We acknowledge that our work was conducted on Tasmanian Aboriginal lands and thank the Tasmanian Aboriginal community for their ongoing support of our research. We would like to thank Alexa Benson, Agathe Lisé-Pronovost, Angelica Ramierez, William Rapuc, Scott Nichols and Anthony Romano for their assistance in the field. The financial support of this project comes from the Australian Research Council (award: DI110100019 and IN140100050) and Australian Institute of Nuclear Science and Engineering (award: ALNGRA15003). We thank an anonymous reviewer for their constructive comments on an earlier draft that resulted in a substantial improvement of the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59329
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作者单位: School of Geography, University of Melbourne, Parkville, Australia; Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales, Australia

Recommended Citation:
Beck K.K.,Fletcher M.-S.,Gadd P.S.,et al. TITLE: An early onset of ENSO influence in the extra-tropics of the southwest Pacific inferred from a 14, 600 year high resolution multi-proxy record from Paddy's Lake, northwest Tasmania[J]. Quaternary Science Reviews,2017-01-01,157
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