DOI: 10.1029/2019PA003762
论文题名: Monsoons, Upwelling, and the Deoxygenation of the Northwestern Indian Ocean in Response to Middle to Late Miocene Global Climatic Shifts
作者: Bialik O.M. ; Auer G. ; Ogawa N.O. ; Kroon D. ; Waldmann N.D. ; Ohkouchi N.
刊名: Paleoceanography and Paleoclimatology
ISSN: 25724517
出版年: 2020
卷: 35, 期: 2 语种: 英语
英文关键词: Arabian Sea
; oceanic reorganization
; ODP Site 722
; OMZ
; South Asian Monsoon
; upwelling
Scopus关键词: biogenic deposit
; denitrification
; glaciation
; global climate
; long-term change
; Miocene
; monsoon
; Ocean Drilling Program
; oceanic circulation
; oxygen minimum layer
; oxygenation
; paleoceanography
; paleontology
; uplift
; upwelling
; Antarctica
; Arabian Sea
; China
; Indian Ocean
; Indian Ocean (Northwest)
; Oman
; Qinghai-Xizang Plateau
英文摘要: Today, upwelling along the Oman margin in the Arabian Sea is governed by the South Asian Monsoon winds. The Oman upwelling results in the formation of an oxygen minimum zone (OMZ) spanning across the Arabian Sea and large parts of the Indian Ocean. While these conditions are recorded as early as the middle Miocene (~15 Ma), the long-term dynamics of upwelling in the Arabian Sea are as of yet poorly constrained during the middle to late Miocene. Here, we use organic and inorganic proxies combined with sedimentary and paleontological records to constrain the evolution of upwelling at Ocean Drilling Program Site 722B between ~15 and ~8.7 Ma. Our record shows that Mn depletion occurred at ~14.5 Ma, likely due to regionally confined OMZ formation at that time. Biogenic silica accumulation intensified between ~12.5 and ~11 Ma. The δ15N values (>6‰) provide evidence for the onset of at least intermittent denitrification between ~11 and ~9.5 Ma during the apex of the global “carbonate crash.” Our data demonstrate that upwelling and OMZ intensity in the Arabian Sea were linked to the reorganization of the Indian Ocean circulation system and South Asian Monsoon during the Miocene. The initiation of these systems occurred once the regional tectonic configuration (i.e., the uplift of the Tibetan Plateau ~25 Ma and the closure of the Tethyan seaway ~20 Ma) was in place. The subsequent development of monsoonal upwelling after 14 Ma responded to latitudinal shifts in climatic belts following the progressive Miocene glaciation of Antarctica. © 2020. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159494
Appears in Collections: 气候变化与战略
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作者单位: The Dr. Moses Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Haifa, Israel; Now at Institute of Geology, CEN, University of Hamburg, Hamburg, Germany; Research Institute for Marine Resources Utilization (Biogeochemistry Program), Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom
Recommended Citation:
Bialik O.M.,Auer G.,Ogawa N.O.,et al. Monsoons, Upwelling, and the Deoxygenation of the Northwestern Indian Ocean in Response to Middle to Late Miocene Global Climatic Shifts[J]. Paleoceanography and Paleoclimatology,2020-01-01,35(2)