DOI: 10.1016/j.quascirev.2015.08.022
Scopus记录号: 2-s2.0-84931283949
论文题名: Southern Westerly Winds submit to the ENSO regime: A multiproxy paleohydrology record from Lake Dobson, Tasmania
作者: Rees A.B.H. ; Cwynar L.C. ; Fletcher M.-S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 126 起始页码: 254
结束页码: 263
语种: 英语
英文关键词: Charcoal
; Chironomids
; ENSO
; Fire
; Holocene
; Itrax
; Paleohydrology
; Southern westerly winds
Scopus关键词: Atmospheric pressure
; Charcoal
; Fires
; Hydrology
; Lakes
; Nickel
; Wind
; Chironomids
; ENSO
; Holocenes
; Itrax
; Paleo-hydrology
; Southern westerly winds
; Climatology
; charcoal
; El Nino
; El Nino-Southern Oscillation
; fly
; Holocene
; La Nina
; lake ecosystem
; paleohydrology
; precipitation intensity
; proxy climate record
; Southern Hemisphere
; westerly
; wind field
; Australasia
; Australia
; Mount Field National Park
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Tasmania
; Chironomidae
英文摘要: The El Niño-Southern Oscillation (ENSO) and Southern Westerly Winds (SWW) profoundly influence synoptic-scale climate in the Southern Hemisphere. Although many studies have invoked either phenomenon to explain trends in proxy data, few have demonstrated the transition from a climate dominated by SWW flow to one controlled by El Niño activity, which is postulated to have occurred after 5 cal ka BP in the mid-latitudes of the Southern Hemisphere. Tasmania, southeast Australia, is ideally situated to detect changes in both of these climatic controls. Currently, El Niño and La Niña events result in drier and wetter conditions island-wide, respectively, with the greatest impact in the north. Further, Tasmania houses north-south trending mountain ranges near its western coast. As a result, areas west of the mountains exhibit a positive correlation between SWW flow and precipitation, while eastern regions possess either no or a negative relationship. Here, we present data from chironomid remains, charcoal, and geochemical proxies to investigate the paleohydrological history of Lake Dobson, a site located in Mount Field National Park, Tasmania. The proxies revealed three broad periods: (1) an early Holocene (11.5-8.3 cal kyr BP) characterised by generally high rainfall, the occurrence of irregular fires, and elevated charcoal influx at 11.4 and 10.2 cal ka BP - conditions compatible with attenuated SWW flow over the site; (2) an ambiguous mid-Holocene (8.3-5 cal kyr BP) that marks the transition from a SWW- to ENSO-dominated climate; and (3) a relatively dry and stable late Holocene (5 cal kyr BP to present) that is consistent with the onset of a climate controlled by ENSO activity (i.e., characterised by a more mean El Niño climate state). The proxy record of Lake Dobson highlights the teleconnections between the equatorial Pacific and southern Australasia. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59818
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Biology, University of New Brunswick, Fredericton, NB, Canada; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand; School of Geography, Faculty of Science, University of Melbourne, Melbourne, VIC, Australia
Recommended Citation:
Rees A.B.H.,Cwynar L.C.,Fletcher M.-S.. Southern Westerly Winds submit to the ENSO regime: A multiproxy paleohydrology record from Lake Dobson, Tasmania[J]. Quaternary Science Reviews,2015-01-01,126