DOI: 10.1038/s41561-019-0499-z
论文题名: Decadal variability in twentieth-century ocean acidification in the California Current Ecosystem
作者: Osborne E.B. ; Thunell R.C. ; Gruber N. ; Feely R.A. ; Benitez-Nelson C.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 1 起始页码: 43
结束页码: 49
语种: 英语
英文关键词: aquatic organism
; calcification
; carbonate system
; decadal variation
; foraminifera
; fossil record
; global ocean
; marine sediment
; ocean acidification
; Pacific Decadal Oscillation
; planktonic foraminifera
; sediment core
; twentieth century
; upwelling
; California
; California Current
; Pacific Ocean
; Pacific Ocean
; United States
; Foraminifera
英文摘要: Oceanic uptake of CO2 can mitigate climate change, but also results in global ocean acidification. Ocean acidification-related changes to the marine carbonate system can disturb ecosystems and hinder calcification by some organisms. Here, we use the calcification response of planktonic foraminifera as a tool to reconstruct the progression of ocean acidification in the California Current Ecosystem through the twentieth century. Measurements of nearly 2,000 fossil foraminifera shell weights and areas preserved in a marine sediment core showed a 20% reduction in calcification by a surface-dwelling foraminifera species. Using modern calibrations, this response translates to an estimated 35% reduction in carbonate ion concentration, a biologically important chemical component of the carbonate system. Assuming other aspects of the carbonate system, this represents a 0.21 decline in pH, exceeding the estimated global average decline by more than a factor of two. Our proxy record also shows considerable variability that is significantly correlated with Pacific Decadal Oscillation and decadal-scale changes in upwelling strength, a relationship that until now has been obscured by the relatively short observational record. This modulation suggests that climatic variations will play an important role in amplifying or alleviating the anthropogenic signal and progression of ocean acidification in this region. © 2019, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169658
Appears in Collections: 气候变化与战略
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作者单位: Ocean Acidification Program, National Oceanic and Atmospheric Administration, Silver Spring, MD, United States; Cooperative Program for the Advancement of Earth System Science, University Corporation for Atmospheric Research, Boulder, CO, United States; School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC, United States; Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zurich, Switzerland; Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, WA, United States
Recommended Citation:
Osborne E.B.,Thunell R.C.,Gruber N.,et al. Decadal variability in twentieth-century ocean acidification in the California Current Ecosystem[J]. Nature Geoscience,2020-01-01,13(1)