DOI: 10.1016/j.quascirev.2012.07.018
Scopus记录号: 2-s2.0-84880602819
论文题名: A review of the Australian-New Zealand sector of the Southern Ocean over the last 30ka (Aus-INTIMATE project)
作者: Bostock H.C. ; Barrows T.T. ; Carter L. ; Chase Z. ; Cortese G. ; Dunbar G.B. ; Ellwood M. ; Hayward B. ; Howard W. ; Neil H.L. ; Noble T.L. ; Mackintosh A. ; Moss P.T. ; Moy A.D. ; White D. ; Williams M.J.M. ; Armand L.K.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 74 起始页码: 35
结束页码: 57
语种: 英语
英文关键词: δ13C
; δ18O
; AAIW
; Alkenones
; Antarctic Circumpolar Current
; Antarctic Cold Reversal
; Antarctic ice-sheets
; Australia
; Diatoms
; Dust
; Foraminifera
; Glaciers
; Holocene
; INTIMATE
; LCDW
; LGM
; Mg/Ca
; Moraines
; New Zealand
; Opal
; Pacific
; PF
; Pollen
; SAF
; Sea-ice
; Southern Ocean
; SST
; STF
Scopus关键词: AAIW
; Alkenones
; Antarctic Circumpolar Currents
; Antarctic cold reversals
; Australia
; Diatoms
; Foraminifera
; Holocenes
; Ice sheet
; INTIMATE
; LCDW
; LGM
; Moraines
; New zealand
; Opal
; Pacific
; PF
; Pollen
; SAF
; Southern ocean
; SST
; STF
; Atmospheric temperature
; Dust
; Glacial geology
; Glaciers
; Isotopes
; Ocean currents
; Sea ice
; Carbon dioxide
; air temperature
; bathymetry
; carbon dioxide
; cold seep
; deep water
; diatom
; dust
; foraminifera
; Holocene
; iceberg
; literature review
; microfossil
; moraine
; sea ice
; sea surface temperature
; ventilation
; water mass
; Australia
; New Zealand
; Southern Ocean
; Bacillariophyta
; Foraminifera
英文摘要: The Australia/New Zealand region of the Southern Ocean is influenced by several of the major global water masses of the oceans and is the prime entry point for cold deep waters into the Pacific basin. During the last glacial there was increased sea-ice extent around Antarctica (as far north as 55°S), as well as increased iceberg presence inferred from ice-rafted debris. Evidence from microfossil assemblages suggests that sea surface temperatures (SST) were up to 7°C cooler, consistent with recent estimates of cooling for New Zealand derived from glacier modelling and other terrestrial proxies. The Subtropical Front (STF), Subantarctic Front (SAF) and Polar Front (PF) had migrated north, except where the position of the fronts were controlled bathymetrically. Despite the potential for iron fertilisation by increased dust input into the ocean during the glacial, there is limited evidence for higher total biological productivity in the Pacific sector of the Southern Ocean. The altered oceanic circulation during the glacial also decreased nutrients in the surface waters and affected the outgassing of CO2. This contributed to an increased storage of CO2 in the deep waters and lowering of the carbonate lysocline.During the deglaciation, sea-ice retreat and SST increased rapidly at ~18ka, roughly synchronous with the reinvigoration of deep water circulation in the Southern Ocean and the release of CO2 stored in the deep waters. The gradient in carbon isotopes (δ13Cbenthic) between Antarctic Intermediate Water (AAIW) and lower Circumpolar Deep Water (LCDW) was greatest at the start of the deglaciation, suggesting that the AAIW ventilation preceded LCDW ventilation, or there was a significant change in air-sea fractionation of δ13C. There was a slight enrichment in δ18Oplanktic, decrease in SSTs and a reduction in intermediate and deep water circulation between ~14 and 12.5kaBP during the Antarctic Cold Reversal (ACR), coincident with glacier advances in the New Zealand Southern Alps and other terrestrial records of cooling. Following the ACR, there was a second, more minor, release of deep water CO2, most likely related to reinvigoration of North Atlantic Deep Water (NADW). From 10ka onwards the modern intermediate and deep water circulation was established.Air temperatures and SSTs reached a maximum in the early Holocene, with the STF located at its most southerly position, and there was a widespread retreat of Antarctic ice sheets to their modern position. Adecline to modern SST and air temperatures in the mid to late Holocene followed. While millennial cycles overprinted on the SST and δ18Oplanktic records, may be the result of subtle changes in the position and strength of the westerly winds during the Holocene. © 2012. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60576
Appears in Collections: 过去全球变化的重建
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作者单位: National Institute of Water and Atmospheric Research, Private Bag 14-901, Wellington 6421, New Zealand; Department of Geography, University of Exeter, Rennes Drive, Exeter, EX4 4RJ, United Kingdom; Antarctic Research Centre, Victoria University, P.O. Box 600, Wellington, New Zealand; Institute for Marine and Antarctic Studies, University of Tasmania, TAS 7001, Australia; GNS Science, P.O. Box 30368, Lower Hutt 5040, New Zealand; Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; Geomarine Research, 49 Swainston Rd., Auckland, New Zealand; School of Earth Sciences, University of Tasmania, Private Bag 79, Hobart, TAS 7001, Australia; School of Geography Planning and Environmental Management, University of Queensland, Brisbane, Qld 4072, Australia; Department of the Sustainability, Environment Water, Population and Communities, Australian Antarctic Division, Kingston, TAS 7050, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, TAS 7001, Australia; Institute for Applied Ecology, University of Canberra, ACT 2601, Australia; Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia
Recommended Citation:
Bostock H.C.,Barrows T.T.,Carter L.,et al. A review of the Australian-New Zealand sector of the Southern Ocean over the last 30ka (Aus-INTIMATE project)[J]. Quaternary Science Reviews,2013-01-01,74