气候变化领域集成服务门户(CCPortal): The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea

CCPortal

DOI	10.1029/2023GB007828
	The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea
	Debyser, M. C. F.; Pichevin, L.; Tuerena, R. E.; Doncila, A.; Semiletov, I.; Ganeshram, R. S.
发表日期	2024
ISSN	0886-6236
EISSN	1944-9224
起始页码	38
结束页码	4
卷号	38 期号:4
英文摘要	Arctic shelves receive a large load of nutrients from Arctic rivers, which play a major role in the biogeochemical cycles of the Arctic Ocean. In this study, we present measurements of dissolved silicon isotopes (delta Si-30(OH)(4)) around the Laptev Sea and surface waters of the Eurasian shelves collected in October 2018 to document terrestrial silicon modifications on shelves and their contribution to the Arctic basin. Nitrogen was found to be depleted in surface waters and the limiting nutrient to primary production in the Laptev Sea, allowing excess silicon export to the central Arctic Ocean. Heavy delta Si-30(OH)(4) in the water column was linked to the strong biological removal of DSi on shelves, enabled by vigorous N recycling. From isotopically constrained processes, we estimate that >50% of the silicon from riverine inputs is removed within the Lena River delta and on the Laptev Sea shelf. Extrapolating this to major Siberian rivers, this leads to an export of 2.5 +/- 0.8 kmol/s of riverine silicon through the Transpolar Drift. An updated isotopic budget of the Arctic Ocean reproduces the observed delta Si-30(OH)(4) signatures out of the Arctic Ocean and underlines the importance of biological processes in modulating silicon export. Given that opal burial fluxes on Artic shelves are controlled by denitrification and N-limitation, these processes are sensitive to ongoing climate change. As a consequence of higher riverine DSi inputs and shelf denitrification responding to productivity, it is inferred that silicon export from the Arctic Ocean could increase in the future, accompanied by lighter delta Si-30(OH)(4) signatures.
英文关键词	Laptev Sea; silicon isotopes; Arctic Ocean; biogeochemical cycles; Si budget
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001191297000001
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/302014
作者单位	University of Edinburgh; Woods Hole Oceanographic Institution; UHI Millennium Institute; Ilichev Pacific Oceanological Institute; Russian Academy of Sciences; Tomsk State University
推荐引用方式 GB/T 7714	Debyser, M. C. F.,Pichevin, L.,Tuerena, R. E.,et al. The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea[J],2024,38(4).
APA	Debyser, M. C. F.,Pichevin, L.,Tuerena, R. E.,Doncila, A.,Semiletov, I.,&Ganeshram, R. S..(2024).The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea.GLOBAL BIOGEOCHEMICAL CYCLES,38(4).
MLA	Debyser, M. C. F.,et al."The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea".GLOBAL BIOGEOCHEMICAL CYCLES 38.4(2024).