DOI: 10.1016/j.quascirev.2017.11.033
Scopus记录号: 2-s2.0-85035789379
论文题名: Heat export from the tropics drives mid to late Holocene palaeoceanographic changes offshore southern Australia
作者: Perner K. ; Moros M. ; De Deckker P. ; Blanz T. ; Wacker L. ; Telford R. ; Siegel H. ; Schneider R. ; Jansen E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 180 起始页码: 96
结束页码: 110
语种: 英语
英文关键词: Australia
; ENSO
; Holocene
; Palaeoceanography
; Planktic foraminifer
; Sea surface temperature
; Southern Ocean
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Climatology
; Digital storage
; Heat storage
; Nickel
; Submarine geophysics
; Surface properties
; Surface waters
; Tropics
; Australia
; ENSO
; Holocenes
; Palaeoceanography
; Planktic foraminifera
; Sea surface temperature (SST)
; Southern ocean
; Oceanography
; climate conditions
; cooling
; heat flux
; heat transfer
; Holocene
; nearshore environment
; paleoceanography
; planktonic foraminifera
; reconstruction
; sea surface temperature
; stratification
; tropical environment
; warm pool
; water column
; Atlantic Ocean
; Atlantic Ocean (North)
; Australia
; Indian Ocean
; Leeuwin Current
; Southern Ocean
; Foraminifera
英文摘要: The Leeuwin Current (LC), an eastern boundary current, transports tropical waters from the Indo-Pacific Warm Pool (IPWP) towards southern latitudes and modulates oceanic conditions offshore southern Australia. New, high-resolution planktic foraminifer assemblage data and alkenone-derived sea surface temperatures (SST) provide an in-depth view on LC variability and mechanisms driving the current's properties during the mid to late Holocene (last c. 7.4 ka BP). Our marine reconstructions highlight a longer-term mid to late Holocene reduction of tropical heat export from the IPWP area into the LC. Mid Holocene (c. 7.4 to 3.5 ka BP) occurrence of high SSTs (>19.5 °C), tropical planktic foraminifera and a well-stratified water column document an enhanced heat export from the tropics. From c. 3.5 ka BP onwards, a weaker LC and a notably reduced tropical heat export cause oceanic cooling offshore southern Australia. The observed mid to late Holocene trends likely result from large-scale changes in the IPWP's heat storage linked to the El Niño-Southern Oscillation (ENSO) phenomenon. We propose that a strong and warm LC occurs in response to a La Niña-like state of ENSO during the mid Holocene. The late Holocene LC cooling, however, results from a shift towards an El Niño-like state and a more variable ENSO system that causes cooling of the IPWP. Superimposed on these longer-term trends we find evidence of distinct late Holocene millennial-scale phases of enhanced El Niño/La Niña development, which appear synchronous with northern hemispheric climatic variability. Phases of dominant El Niño-like states occur parallel to North Atlantic cold phases: the ‘2800 years BP cooling event’, the ‘Dark Ages’ and the ‘Little Ice Age’, whereas the ‘Roman Warm Period’ and the ‘Medieval Climate Anomaly’ parallel periods of a predominant La Niña-like state. Our findings provide further evidence of coherent interhemispheric climatic and oceanic conditions during the mid to late Holocene, suggesting ENSO as a potential mediator. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112327
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Leibniz Institute for Baltic Sea Research, Seestraße 15, Rostock, 18119, Germany; Department of Earth Science, University of Bergen, Allégaten 41 and Bjerknes Centre for Climate Research, Jahnebakken 5, Bergen, 5007, Norway; Research School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia; Laboratory of Ion Beam Physics (LIP), ETH, Otto-Stern-Weg 5, Zürich, 8093, Switzerland; Institute of Geosciences, Department of Geology, Kiel University, Ludwig-Meyn-Straße 10, Kiel, 24118, Germany; EECRG, Department of Biology, University of Bergen, Thormølengate 53A, Bergen, 5007, Norway
Recommended Citation:
Perner K.,Moros M.,De Deckker P.,et al. Heat export from the tropics drives mid to late Holocene palaeoceanographic changes offshore southern Australia[J]. Quaternary Science Reviews,2018-01-01,180