气候变化领域集成服务门户(CCPortal): Zn Isotope Composition in the Water Column of the Northwestern Pacific Ocean: The Importance of External Sources

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DOI	10.1029/2019GB006379
	Zn Isotope Composition in the Water Column of the Northwestern Pacific Ocean: The Importance of External Sources
	Liao W.-H.; Takano S.; Yang S.-C.; Huang K.-F.; Sohrin Y.; Ho T.-Y.
发表日期	2020
ISSN	0886-6236
EISSN	1944-9224
卷号	34 期号:1
英文摘要	We determined Zn isotope composition (δ66Zn) in the water column of the Northwestern Pacific Ocean (NWPO) and its marginal seas to investigate the processes driving vertical and spatial variations. Comparable to previous studies, dissolved δ66Zn was relatively low in the top 200 m, ranging from −0.91 to +0.24‰ and increased with depth toward an averaged value, +0.38±0.10‰, in deep water. We found that δ66Zn observed in the deep water of the NWPO was much lower than the Northeastern Pacific Ocean. Box model approaches suggest that spatial variations in the deep water may be attributed to isotopically light Zn originating from sedimentary input or anthropogenic aerosols. In the surface water, the fractionation factors derived from both closed or open system fractionation models are all less than one in the NWPO. However, both closed and open system models show a relatively poor fit to the measured data. We thus propose that external input is a major factor causing the variations of [Zn] and δ66Zn values in surface water, in addition to the effects of scavenging, physical mixing, and biological uptake. As elevated [Zn] and relatively light δ66Zn in the surface water were observed in high aerosol input regions, aerosol deposition may play a dominant role in regulating Zn elemental and isotopic composition in the surface ocean. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol; GEOTRACES; Northwestern Pacific Ocean; Zn concentrations; Zn isotopes
语种	英语
scopus关键词	aerosol; deep water; isotopic composition; isotopic fractionation; spatial variation; surface water; water column; zinc; Pacific Ocean; Pacific Ocean (Northwest)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129675
作者单位	Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; Institute for Chemical Research, Kyoto University, Uji, Japan; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Institute of Oceanography, National Taiwan University, Taipei, Taiwan
推荐引用方式 GB/T 7714	Liao W.-H.,Takano S.,Yang S.-C.,et al. Zn Isotope Composition in the Water Column of the Northwestern Pacific Ocean: The Importance of External Sources[J],2020,34(1).
APA	Liao W.-H.,Takano S.,Yang S.-C.,Huang K.-F.,Sohrin Y.,&Ho T.-Y..(2020).Zn Isotope Composition in the Water Column of the Northwestern Pacific Ocean: The Importance of External Sources.Global Biogeochemical Cycles,34(1).
MLA	Liao W.-H.,et al."Zn Isotope Composition in the Water Column of the Northwestern Pacific Ocean: The Importance of External Sources".Global Biogeochemical Cycles 34.1(2020).