气候变化领域集成服务门户(CCPortal): Appraisal of sedimentary alkenones for the quantitative reconstruction of phytoplankton biomass

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DOI	10.1073/pnas.2014787118
	Appraisal of sedimentary alkenones for the quantitative reconstruction of phytoplankton biomass
	Raja M.; Rosell-Melé A.
发表日期	2021
ISSN	00278424
卷号	118 期号:2
英文摘要	Marine primary productivity (PP) is the driving factor in the global marine carbon cycle. Its reconstruction in past climates relies on biogeochemical proxies that are not considered to provide an unequivocal signal. These are often based on the water column flux of biogenic components to sediments (organic carbon, biogenic opal, biomarkers), although other factors than productivity are posited to control the sedimentary contents of the components, and their flux is related to the fraction of export production buried in sediments. Moreover, most flux proxies have not been globally appraised. Here, we assess a proxy to quantify past phytoplankton biomass by correlating the concentration of C37 alkenones in a global suite of core-top sediments with sea surface chlorophyll-a (SSchla) estimates over the last 20 y. SSchla is the central metric to calculate phytoplankton biomass and is directly related to PP. We show that the global spatial distribution of sedimentary alkenones is primarily correlated to SSchla rather than diagenetic factors such as the oxygen concentration in bottom waters, which challenges previous assumptions on the role of preservation on driving concentrations of sedimentary organic compounds. Moreover, our results suggest that the rate of global carbon export to sediments is not regionally constrained, and that alkenones producers play a dominant role in the global export of carbon buried in the seafloor. This study shows the potential of using sedimentary alkenones to estimate past phytoplankton biomass, which in turn can be used to infer past PP in the global ocean. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Global export and burial; Marine sediments; Primary productivity; Proxy; Remote sensing
语种	英语
scopus关键词	alkenone derivative; carbon; chlorophyll a; environmental chemical; organic compound; surface water; unclassified drug; Article; biomass production; concentration (parameter); controlled study; correlational study; diagenesis; geographic distribution; heredity; nonhuman; oxygen concentration; photosynthesis; phytoplankton; priority journal; sea pollution; sediment
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/181040
作者单位	Institut de Ciència i Tecnologia Ambientals, Universitat Autònoma de Barcelona, Bellaterra, Catalonia, 08193, Spain; Institució Catalana de Recerca i Estudis Avançats, Barcelona, Catalonia, 08010, Spain
推荐引用方式 GB/T 7714	Raja M.,Rosell-Melé A.. Appraisal of sedimentary alkenones for the quantitative reconstruction of phytoplankton biomass[J],2021,118(2).
APA	Raja M.,&Rosell-Melé A..(2021).Appraisal of sedimentary alkenones for the quantitative reconstruction of phytoplankton biomass.Proceedings of the National Academy of Sciences of the United States of America,118(2).
MLA	Raja M.,et al."Appraisal of sedimentary alkenones for the quantitative reconstruction of phytoplankton biomass".Proceedings of the National Academy of Sciences of the United States of America 118.2(2021).