气候变化领域集成服务门户(CCPortal): Rates of seafloor and continental weathering govern Phanerozoic marine phosphate levels

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DOI	10.1038/s41561-022-01075-1
	Rates of seafloor and continental weathering govern Phanerozoic marine phosphate levels
	Sharoni, Shlomit; Halevy, Itay
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	75
结束页码	+
卷号	16 期号:1 页码:19
英文摘要	Phosphate is an essential macronutrient for all organisms with a key role in setting levels of marine primary productivity. Despite its importance for marine biogeochemical cycles and its role in shaping the evolution of marine organisms, the factors controlling phosphate bioavailability on geologic timescales remain poorly understood. Here we develop a statistical model of the coupled cycles of phosphate, carbon, oxygen and calcium to constrain the weathering-derived fluxes and seawater concentrations of phosphate through Phanerozoic time (541 million years ago to the present). Our model includes input parameters and time-dependent forcings derived from geologic and geochemical data. We find that the climate sensitivity of chemical weathering of the oceanic crust by low-temperature fluids exerts a first-order control on phosphate availability. Specifically, continental weathering is a source of the limiting nutrient phosphate, but seafloor weathering is considered to be a minor phosphate sink. Consequently, times in Earth history during which seafloor weathering constituted a large fraction of the total (seafloor + continental) weathering were also times during which phosphate influxes to and concentrations in the ocean were relatively low. Lower seawater phosphate levels during those times probably resulted in lower primary productivity and oceanic and atmospheric oxygen concentrations.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000903163700001
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272506
作者单位	Weizmann Institute of Science
推荐引用方式 GB/T 7714	Sharoni, Shlomit,Halevy, Itay. Rates of seafloor and continental weathering govern Phanerozoic marine phosphate levels[J],2023,16(1):19.
APA	Sharoni, Shlomit,&Halevy, Itay.(2023).Rates of seafloor and continental weathering govern Phanerozoic marine phosphate levels.NATURE GEOSCIENCE,16(1),19.
MLA	Sharoni, Shlomit,et al."Rates of seafloor and continental weathering govern Phanerozoic marine phosphate levels".NATURE GEOSCIENCE 16.1(2023):19.