GSTDTAP  > 地球科学
DOI10.1038/NGEO3024
Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years
Loveley, Matthew R.1; Marcantonio, Franco1; Wisler, Marilyn M.1; Hertzberg, Jennifer E.2; Schmidt, MatthewW.3; Lyle, Mitchell4
2017-10-01
发表期刊NATURE GEOSCIENCE
ISSN1752-0894
EISSN1752-0908
出版年2017
卷号10期号:10
文章类型Article
语种英语
国家USA
英文摘要

The eastern equatorial Pacific Ocean plays a crucial role in global climate, as it is a substantial source of CO2 to the atmosphere and accounts for a significant portion of global new export productivity. Here we present a 100,000-year sediment core from the eastern equatorial Pacific, and reconstruct dust flux, export productivity and bottom-water oxygenation using excess-Th-230-derived fluxes of Th-232 and barium, and authigenic uranium concentrations, respectively. We find that during the last glacial period (71,000 to 41,000 years ago), increased delivery of dust to the eastern equatorial Pacific was coeval with North Atlantic Heinrich stadial events. Millennial-scale pulses of increased dust flux coincided with episodes of heightened biological productivity, suggesting that dissolution of dust released iron that promoted ocean fertilization. We also find that periods of low atmospheric CO2 concentrations were associated with suboxic conditions and increased storage of respired carbon in the deep eastern equatorial Pacific. Increases in CO2 concentrations during the deglaciation are coincident with increases in deep Pacific and Southern Ocean water oxygenation levels. We suggest that deep-ocean ventilation was a primary control on CO2 outgassing in this region, with superimposed pulses of high productivity providing a negative feedback.


领域地球科学 ; 气候变化
收录类别SCI-E
WOS记录号WOS:000412102200013
WOS关键词LAST GLACIAL MAXIMUM ; SOUTHERN-OCEAN ; DEEP-SEA ; TROPICAL PACIFIC ; ATMOSPHERIC CO2 ; DUST ; CLIMATE ; ATLANTIC ; VARIABILITY ; SEDIMENT
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
被引频次:42[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/34739
专题地球科学
气候变化
作者单位1.Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA;
2.Univ Connecticut, Dept Marine Sci, Groton, CT 06340 USA;
3.Old Dominion Univ, Dept Ocean Earth & Atmospher Sci, Norfolk, VA 23529 USA;
4.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA
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Loveley, Matthew R.,Marcantonio, Franco,Wisler, Marilyn M.,et al. Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years[J]. NATURE GEOSCIENCE,2017,10(10).
APA Loveley, Matthew R.,Marcantonio, Franco,Wisler, Marilyn M.,Hertzberg, Jennifer E.,Schmidt, MatthewW.,&Lyle, Mitchell.(2017).Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years.NATURE GEOSCIENCE,10(10).
MLA Loveley, Matthew R.,et al."Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years".NATURE GEOSCIENCE 10.10(2017).
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