干旱区生态环境知识资源中心(Arid): Glacial Dust Surpasses Both Volcanic Ash and Desert Dust in Its Iron Fertilization Potential

Arid

DOI	10.1029/2020GB006821
	Glacial Dust Surpasses Both Volcanic Ash and Desert Dust in Its Iron Fertilization Potential
	Koffman, Bess G.; Yoder, Meg F.; Methven, Taylor; Hanschka, Lena; Sears, Helen B.; Saylor, Patrick L.; Wallace, Kristi L.
通讯作者	Koffman, BG (corresponding author), Colby Coll, Dept Geol, Waterville, ME 04901 USA.
来源期刊	GLOBAL BIOGEOCHEMICAL CYCLES
ISSN	0886-6236
EISSN	1944-9224
出版年	2021
卷号	35 期号:4
英文摘要	The subarctic Pacific Ocean and Bering Sea comprise the second-largest high nitrate, low chlorophyll region in the world, where primary production is limited by the availability of iron (Fe). To estimate the potential impact of different terrestrial aerosol Fe sources on marine ecosystems, we performed a suite of laboratory assessments following established protocols, including: (1) leaching with Milli-Q water, (2) sequential extractions, (3) complete acid digestions, (4) X-ray diffraction, and (5) grain size analysis. Measurements were performed on 20 fine-grained (<5 mu m) glacier-derived sediments from Alaska and the Yukon, two fresh, never-wetted volcanic ashes (Redoubt 2009 and Pavlof 2016), and six weathered ashes (Redoubt and Augustine) which span the past similar to 8,700 years. We compared results to published data on Asian desert-derived sediments, finding that the glacier-derived sediments have five times higher easily reducible Fe (median 2.3 +/- 0.6 wt.%) than desert-derived samples (0.49 +/- 0.1 wt.%) and fourteen times higher easily reducible Fe than fresh ash (0.16 +/- 0.1 wt.%). In addition, fractional Fe solubility was higher in glacial sediment (median cumulative 0.31 +/- 0.11% Fe-S) than volcanic ash (0.04 +/- 0.02% Fe-S). Glacial sediments contained higher concentrations of other bioactive metals including Co, Ni, Cu, Zn, Mo, Cd, and Pb. Results suggest that glacier-derived dust may provide the subarctic Pacific with more bioavailable iron per unit mass than either volcanic ash or Asian desert-derived dust.
英文关键词	Alaska dust iron fertilization iron solubility trace metals volcanic ash
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000644999800004
WOS关键词	SURFACE OCEAN CONDITIONS ; ST ELIAS MOUNTAINS ; MINERAL DUST ; NORTH-ATLANTIC ; AGE CALIBRATION ; SOUTHERN-OCEAN ; NATIONAL-PARK ; DEPOSITION ; PHYTOPLANKTON ; PACIFIC
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350441
作者单位	[Koffman, Bess G.; Yoder, Meg F.; Methven, Taylor; Hanschka, Lena; Sears, Helen B.] Colby Coll, Dept Geol, Waterville, ME 04901 USA; [Yoder, Meg F.] Boston Coll, Dept Earth & Environm Sci, Boston, MA USA; [Saylor, Patrick L.] Cold Reg Res & Engn Lab, Hanover, NH USA; [Saylor, Patrick L.] Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 USA; [Wallace, Kristi L.] US Geol Survey, Volcano Sci Ctr, Anchorage, AK USA
推荐引用方式 GB/T 7714	Koffman, Bess G.,Yoder, Meg F.,Methven, Taylor,et al. Glacial Dust Surpasses Both Volcanic Ash and Desert Dust in Its Iron Fertilization Potential[J]. United States Geological Survey,2021,35(4).
APA	Koffman, Bess G..,Yoder, Meg F..,Methven, Taylor.,Hanschka, Lena.,Sears, Helen B..,...&Wallace, Kristi L..(2021).Glacial Dust Surpasses Both Volcanic Ash and Desert Dust in Its Iron Fertilization Potential.GLOBAL BIOGEOCHEMICAL CYCLES,35(4).
MLA	Koffman, Bess G.,et al."Glacial Dust Surpasses Both Volcanic Ash and Desert Dust in Its Iron Fertilization Potential".GLOBAL BIOGEOCHEMICAL CYCLES 35.4(2021).