DOI: 10.1038/ngeo2139
论文题名: Carbon sequestration during the Palaeocene-Eocene Thermal Maximum by an efficient biological pump
作者: Ma Z. ; Gray E. ; Thomas E. ; Murphy B. ; Zachos J. ; Paytan A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 5 起始页码: 382
结束页码: 388
语种: 英语
Scopus关键词: barite
; biological pump
; carbon sequestration
; estimation method
; paleoceanography
; partial pressure
; Bacteria (microorganisms)
英文摘要: A perturbation of the carbon cycle and biosphere, linked to globally increased temperatures about 55.9 million years ago, characterized the Palaeocene-Eocene Thermal Maximum. Its effect on global oceanic productivity is controversial. Here we present records of marine barite accumulation rates that show distinct peaks during this time interval, suggesting a general increase in export productivity. We propose that changes in marine ecosystems, resulting from high atmospheric partial pressure of CO2 and ocean acidification, led to enhanced carbon export from the photic zone to depth, thereby increasing the efficiency of the biological pump. Higher seawater temperatures at that time increased bacterial activity and organic matter regeneration. Through this process much of the sinking particulate organic matter was probably converted to dissolved inorganic and organic carbon. We estimate that an annual carbon export flux out of the euphotic zone and into the deep ocean waters could have amounted to about 15 Gt during the Palaeocene-Eocene Thermal Maximum. About 0.4% of this carbon is expected to have entered the refractory dissolved organic pool, where it could be sequestered from the atmosphere for tens of thousands of years. Our estimates are consistent with the amount of carbon redistribution expected for the recovery from the Palaeocene-Eocene Thermal Maximum. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106629
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Earth and Planetary Science, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, United States; Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT 06459, United States; Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing 100871, China
Recommended Citation:
Ma Z.,Gray E.,Thomas E.,et al. Carbon sequestration during the Palaeocene-Eocene Thermal Maximum by an efficient biological pump[J]. Nature Geoscience,2014-01-01,7(5)