气候变化领域集成服务门户(CCPortal): Arctic River Dissolved and Biogenic Silicon Exports—Current Conditions and Future Changes With Warming

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DOI	10.1029/2019GB006308
	Arctic River Dissolved and Biogenic Silicon Exports—Current Conditions and Future Changes With Warming
	Carey J.C.; Gewirtzman J.; Johnston S.E.; Kurtz A.; Tang J.; Vieillard A.M.; Spencer R.G.M.
发表日期	2020
ISSN	0886-6236
EISSN	1944-9224
起始页码	no
卷号	34 期号:3
英文摘要	Silicon (Si) exports from terrestrial to marine systems can dictate phytoplankton species composition in Arctic coastal waters. Diatoms are often the dominant autotroph in Arctic waters, making Si an important control on Arctic marine primary productivity. Yet even as Arctic regions are among the fastest warming on Earth, we lack baseline knowledge on the magnitudes and controls of Arctic river Si exports. To address uncertainties in current and future Si behavior, we used a combination of field data and modeling to quantify daily yields of dissolved Si (DSi) and biogenic Si (BSi) from a 400 km space-for-time latitudinal gradient of seven basins across the boreal-Arctic transition in Alaska (United States) over the course of 2 years (2015–2016). Mean annual DSi concentrations (33–149 μM) and yields (13–49 kmol km−2 year−1) were significantly and positively correlated with mean basin active layer depth, indicating that permafrost thaw will likely increase DSi fluxes to Arctic coastal waters. Conversely, BSi concentrations (7–16 μM) and yields (2.6–4.5 kmol km−2 year−1) were more uniform across the seven basins, indicating that warming may not substantially alter BSi loads to coastal systems in the near future. Our data also indicate that climatic warming will advance the timing of Si delivery to coastal waters in the spring, although the ratios of Si to nitrogen in Arctic river exports will likely remain steady. These results highlight the important role of basin hydrology, largely driven by permafrost extent, as a key driver of Si exchange at the land-sea interface in the Arctic. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Arctic; biogenic; climate change; dissolved silica; permafrost; rivers; silica
语种	英语
scopus关键词	active layer; biogenic deposit; biogenic material; coastal water; concentration (composition); dissolved matter; flux measurement; future prospect; global warming; latitudinal gradient; permafrost; phytoplankton; silicon; solute transport; Alaska; Arctic; United States; Bacillariophyta
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/129662
作者单位	Division of Math and Science, Babson College, Wellesley, MA, United States; The Ecosystem Center, Marine Biological Laboratory, Woods Hole, MA, United States; Department of Earth and Environment, Boston University, Boston, MA, United States; Department of Biology, Boston University, Boston, MA, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Institute of Marine Science, University of Auckland, Auckland, New Zealand
推荐引用方式 GB/T 7714	Carey J.C.,Gewirtzman J.,Johnston S.E.,等. Arctic River Dissolved and Biogenic Silicon Exports—Current Conditions and Future Changes With Warming[J],2020,34(3).
APA	Carey J.C..,Gewirtzman J..,Johnston S.E..,Kurtz A..,Tang J..,...&Spencer R.G.M..(2020).Arctic River Dissolved and Biogenic Silicon Exports—Current Conditions and Future Changes With Warming.Global Biogeochemical Cycles,34(3).
MLA	Carey J.C.,et al."Arctic River Dissolved and Biogenic Silicon Exports—Current Conditions and Future Changes With Warming".Global Biogeochemical Cycles 34.3(2020).