气候变化领域集成服务门户(CCPortal): A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean

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DOI	10.1016/j.quascirev.2020.106577
	A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean
	Chen T.; Liu Q.; Roberts A.; Shi X.; Zhang Q.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	To test the biological effectiveness of iron fertilization by Asian aeolian dust and volcanic ash in the stratified high-nitrate, low-chlorophyll subarctic Pacific Ocean over long-time scales, we analysed sediments with ages between 2.8 and 0.9 Ma at ODP Site 885/886. This site lies far from the influence of other iron sources (e.g. icebergs or lateral iron transportation) and the water column has been stratified since intensification of northern hemisphere glaciation (iNHG) at ∼2.7 Ma, which limits nutrient upwelling and makes it an ideal location for testing iron bioavailability of different atmospheric sources that fell onto the surface ocean. We investigate diatom assemblages and opal export changes, and compare them with the properties of iron minerals in Asian aeolian dust and volcanic ash. Our results reveal that Asian aeolian dust contains mostly unreactive iron-bearing minerals that supplied limited bioavailable iron for diatom growth at Site 885/886. Diatom productivity changes were dominated by upwelling/stratification changes over long timescales, and by sporadic iron fertilization from volcanic ash inputs. Iron from volcanic ash particles is likely to have become bioavailable because such particles dissolved more readily due to their high porosity and ultra-fine size. © 2020 Elsevier Ltd
英文关键词	Diatoms; HNLC; Intensification of northern hemisphere glaciation; Iron fertilization; North Pacific Ocean; Plio-Pleistocene transition
语种	英语
scopus关键词	Biochemistry; Chlorophyll; Dust; Glacial geology; Nitrates; Oceanography; Sea ice; Biological effectiveness; Iron bioavailability; Iron-bearing minerals; Northern hemisphere glaciations; Nutrient upwelling; Productivity changes; Subarctic Pacific Ocean; Volcanic ash particles; Volcanoes; bioavailability; chlorophyll; diatom; eolian deposit; iron; nitrate; Ocean Drilling Program; subarctic region; testing method; upwelling; volcanic ash; water column; Pacific Ocean; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151287
作者单位	Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China; Centre for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China; Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia; Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China; Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology, Qingdao, 266061, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Chen T.,Liu Q.,Roberts A.,et al. A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean[J],2020,248.
APA	Chen T.,Liu Q.,Roberts A.,Shi X.,&Zhang Q..(2020).A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean.Quaternary Science Reviews,248.
MLA	Chen T.,et al."A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean".Quaternary Science Reviews 248(2020).