气候变化领域集成服务门户(CCPortal): Nutrient release to oceans from buoyancy-driven upwelling at Greenland tidewater glaciers

CCPortal

DOI	10.1038/s41561-018-0268-4
	Nutrient release to oceans from buoyancy-driven upwelling at Greenland tidewater glaciers
	Cape M.R.; Straneo F.; Beaird N.; Bundy R.M.; Charette M.A.
发表日期	2019
ISSN	17520894
卷号	12 期号:1
英文摘要	The discharge of nutrient-rich meltwater from the Greenland Ice Sheet has emerged as a potentially important contributor to regional marine primary production and nutrient cycling. While significant, this direct nutrient input by the ice sheet may be secondary to the upwelling of deep-ocean-sourced nutrients driven by the release of meltwater at depth in glacial fjords. Here, we present a comprehensive suite of micro- and macronutrient observations collected in Sermilik Fjord at the margin of Helheim, one of Greenland’s largest glaciers, and quantitatively decompose glacial and ocean contributions to fjord dissolved nutrient inventories. We show that the substantial enrichment in nitrate, phosphate and silicate observed in the upper 250 m of the glacial fjord is the result of upwelling of warm subtropical waters present at depth throughout the fjord. These nutrient-enriched fjord waters are subsequently exported subsurface to the continental shelf. The upwelled nutrient transport within Sermilik rivals exports by the largest Arctic rivers and the ice sheet as a whole, suggesting that glacier-induced pumping of deep nutrients may constitute a major source of macronutrients to the surrounding coastal ocean. The importance of this mechanism is likely to grow given projected increases in surface melt of the ice sheet. © 2018, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	buoyancy; continental shelf; fjord; global ocean; ice sheet; marine environment; meltwater; nutrient; nutrient cycling; primary production; subtropical region; tidewater glacier; upwelling; Arctic; Greenland; Greenland Ice Sheet; Helheim Glacier; Sermilik
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/124742
作者单位	Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Oceanography, University of Washington, Seattle, WA, United States; Climate, Atmospheric Sciences, and Physical Oceanography Department, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Cape M.R.,Straneo F.,Beaird N.,et al. Nutrient release to oceans from buoyancy-driven upwelling at Greenland tidewater glaciers[J],2019,12(1).
APA	Cape M.R.,Straneo F.,Beaird N.,Bundy R.M.,&Charette M.A..(2019).Nutrient release to oceans from buoyancy-driven upwelling at Greenland tidewater glaciers.Nature Geoscience,12(1).
MLA	Cape M.R.,et al."Nutrient release to oceans from buoyancy-driven upwelling at Greenland tidewater glaciers".Nature Geoscience 12.1(2019).