气候变化领域集成服务门户(CCPortal): Millennial-scale variations in sedimentary oxygenation in the western subtropical North Pacific and its links to North Atlantic climate

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DOI	10.5194/cp-16-387-2020
	Millennial-scale variations in sedimentary oxygenation in the western subtropical North Pacific and its links to North Atlantic climate
	Zou J.; Shi X.; Zhu A.; Kandasamy S.; Gong X.; Lembke-Jene L.; Chen M.-T.; Wu Y.; Ge S.; Liu Y.; Xue X.; Lohmann G.; Tiedemann R.
发表日期	2020
ISSN	18149324
起始页码	387
结束页码	407
卷号	16 期号:1
英文摘要	The deep-ocean carbon cycle, especially carbon sequestration and outgassing, is one of the mechanisms to explain variations in atmospheric CO2 concentrations on millennial and orbital timescales. However, the potential role of subtropical North Pacific subsurface waters in modulating atmospheric CO2 levels on millennial timescales is poorly constrained. An increase in the respired CO2 concentration in the glacial deep-ocean due to biological pump generally corresponds to deoxygenation in the ocean interior. This link thus offers a chance to study oceanic ventilation and coeval export productivity based on redox-controlled sedimentary geochemical parameters. Here, we investigate a suite of geochemical proxies in a sediment core from the Okinawa Trough to understand sedimentary oxygenation variations in the subtropical North Pacific over the last 50 000 years (50 ka). Our results suggest that enhanced mid-depth western subtropical North Pacific (WSTNP) sedimentary oxygenation occurred during cold intervals and after 8.5 ka, while oxygenation decreased during the B lling-Aller d (B/A) and Preboreal. The enhanced oxygenation during cold spells is linked to the North Pacific IntermediateWater (NPIW), while interglacial increase after 8.5 ka is linked to an intensification of the Kuroshio Current due to strengthened northeast trade winds over the tropics. The enhanced formation of the NPIW during Heinrich Stadial 1 (HS1) was likely driven by the perturbation of sea ice formation and sea surface salinity oscillations in the high-latitude North Pacific. The diminished sedimentary oxygenation during the B/A due to a decreased NPIW formation and enhanced export production, indicates an expansion of the oxygen minimum zone in the North Pacific and enhanced CO2 sequestration at mid-depth waters, along with the termination of atmospheric CO2 concentration increase. We attribute the millennial-scale changes to an intensified NPIW and enhanced abyss flushing during deglacial cold and warm intervals, respectively, closely related to variations in North Atlantic Deep Water formation. © Author(s) 2020.
语种	英语
scopus关键词	atmosphere-ocean system; biological pump; carbon sequestration; deep water ventilation; interglacial; intermediate water; North Atlantic Deep Water; timescale; East China Sea; Kuroshio Current; Okinawa Trough; Pacific Ocean; Pacific Ocean (North)
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146739
作者单位	Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, MNR, Qingdao, 266061, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China; Department of Geological Oceanography and State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, China; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, 27570, Germany; Institute of Earth Sciences, Center of Excellence for the Oceans, Center of Excellence for Ocean Engineering, National Taiwan Ocean University, Keelung, 20224, Taiwan
推荐引用方式 GB/T 7714	Zou J.,Shi X.,Zhu A.,et al. Millennial-scale variations in sedimentary oxygenation in the western subtropical North Pacific and its links to North Atlantic climate[J],2020,16(1).
APA	Zou J..,Shi X..,Zhu A..,Kandasamy S..,Gong X..,...&Tiedemann R..(2020).Millennial-scale variations in sedimentary oxygenation in the western subtropical North Pacific and its links to North Atlantic climate.Climate of the Past,16(1).
MLA	Zou J.,et al."Millennial-scale variations in sedimentary oxygenation in the western subtropical North Pacific and its links to North Atlantic climate".Climate of the Past 16.1(2020).