DOI: 10.1016/j.quascirev.2014.09.030
Scopus记录号: 2-s2.0-84908658148
论文题名: Land-sea correlations in the Australian region: Post-glacial onset of the monsoon in northwestern Western Australia
作者: De Deckker P. ; Barrows T.T. ; Rogers J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 105 起始页码: 181
结束页码: 194
语种: 英语
英文关键词: Aragonite compensation depth
; Australian monsoon
; Clay mineralogy
; Deglaciation
; Foraminifer MAT
; Indo Pacific Warm Pool
; Leeuwin Current
; Maritime continent
; Mixed layer depth
; Sea-surface temperature
Scopus关键词: Aragonite compensation depth
; Australian monsoon
; Clay mineralogy
; Deglaciations
; Foraminifer MAT
; Leeuwin current
; Maritime Continent
; Mixed layer depths
; Pacific warm pool
; Sea surface temperatures
; benthic foraminifera
; chronology
; climate variation
; correlation
; deglaciation
; El Nino-Southern Oscillation
; luminescence dating
; micropaleontology
; mixed layer
; monsoon
; Postglacial
; radiocarbon dating
; river discharge
; salinity
; sea surface temperature
; throughfall
; warm pool
; Australia
; Indian Ocean
; North West Cape
; Pacific Ocean
; Pacific Ocean (West)
; Western Australia
; Foraminifera
英文摘要: Deep-sea core Fr10/95-GC17, collected offshore North West Cape at the western tip of Western Australia, is located beneath the path of the Leeuwin Current. This shallow, warm and low salinity current is an offshoot of the Indonesian Throughflow that transfers water and heat from the West Pacific Ocean into the Indian Ocean. The location is at the edge of the Indo Pacific Warm Pool, the source of large-scale transfer of moisture and heat from the ocean to the atmosphere. For this core, we combine previously published data with new research and use a revised chronology to re-examine the timing of climate change during the last 34,000 years in the tropics of northern Australia. The age model for the core is based on 15 radiocarbon dates complemented by luminescence ages and an oxygen isotope record. This study draws on an extensive range of analyses that have been performed on the core, including micropalaeontology of planktic and benthic foraminifera and coccoliths, stable isotopes analysis of foraminifera and their faunal composition, clay content, sediment composition and pollen analyses. Sea-surface and land temperatures are estimated from the foraminifer faunal analyses and from pollen spectra, respectively. The clay fraction and sediment composition and radiogenic isotopes of that fraction helped identify changes both on land and at sea: changes such as rainfall as shown by river discharge, and oceanic current tracing by neodymium, strontium and lead isotopes obtained from sediments.The most significant finding is that a major threshold was crossed at 13kaBP. Prior to that time, rainfall over NW Western Australia was low as was sea-surface temperature (SST); river discharge to the ocean was also low as a result of the lack of monsoonal activity and finally, ocean alkalinity would have been lower than at present due to the uptake of atmospheric CO2. By 13kaBP, the entire system moved away from glacial period conditions. The Indo-Australian monsoon commenced in and offshore northwestern Western Australia. SST and land temperature increased dramatically and ocean alkalinity changed due to the formation of a "barrier layer" (a low salinity cap), over the Indo Pacific Warm Pool. During the Holocene, river discharge and the land and ocean temperatures did not covary, for example, the highest rainfall did not coincide with the highest SST. Finally, the last 5ka saw a strengthening of ENSO in the region. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60107
Appears in Collections: 过去全球变化的重建
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作者单位: Research School of Earth Sciences, The Australian National University, Acton, ACT, Australia; Geography, College of Life and Environmental Sciences, University of Exeter, Amory Building, Rennes Drive, Exeter, United Kingdom
Recommended Citation:
De Deckker P.,Barrows T.T.,Rogers J.. Land-sea correlations in the Australian region: Post-glacial onset of the monsoon in northwestern Western Australia[J]. Quaternary Science Reviews,2014-01-01,105