DOI: 10.1016/j.palaeo.2017.06.018
论文题名: Productivity-climate coupling recorded in Pleistocene sediments off Prydz Bay (East Antarctica)
作者: Wu L. ; Wang R. ; Xiao W. ; Ge S. ; Chen Z. ; Krijgsman W.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Age model
; Carbonate preservation
; CO2 cycling
; Nutrient supply
; Orbital scales
英文摘要: Export-production in the Southern Ocean is thought to be tightly correlated with atmospheric CO2 fluctuations over geological times. Relevant studies are, however, mainly confined to the Atlantic and Pacific sectors of the Southern Ocean and often only cover the last glacial-interglacial cycle. Here, we present a sediment record retrieved off Prydz Bay (East Antarctica) spanning the last ~520kyrs. We show that the distribution pattern of local export production is closely coupled with global climate change on orbital time scales. We propose that the dominant factors controlling local export production include the amount of nutrients supply from the ocean interior and the extent of sea ice cover, thus representing the combined history of deep water exposure/ventilation and the sea ice coverage in the studied area. Sharp increases in the local export production coincide with abrupt increase in atmospheric CO2 concentrations during deglacial periods, indicating drastic outgassing of the upwelled deep water in the Southern Ocean. Gradually decrease in the export production following interglacial peaks concurs with decrease in deep water exposure/ventilation and increase in sea ice cover, explaining the early decline in atmospheric CO2 over a glacial-interglacial cycle. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68050
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China; First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China; Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, The Netherlands
Recommended Citation:
Wu L.,Wang R.,Xiao W.,et al. Productivity-climate coupling recorded in Pleistocene sediments off Prydz Bay (East Antarctica)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01