期刊
GEOPHYSICAL RESEARCH LETTERS
卷 46, 期 19, 页码 10854-10864出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL084180
关键词
dust; iron; physical weathering; bioavailability; mineralogy; carbon cycle
资金
- European Research Council [ERC-2015-StG-678371 ICYLAB]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- National Science Foundation Graduate Research Fellowship [DGE 16-44869]
- W. O. Crosby Postdoctoral Fellowship at the Massachusetts Institute of Technology
- NERC Independent Research Fellowship [NE/P017630/1]
- Lamont-Doherty Earth Observatory Climate Center
- NERC [NE/P017630/1] Funding Source: UKRI
The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weathered from bedrock are highly bioavailable compared to more chemically weathered, Fe(III)-rich species, suggesting that weathering in dust source regions impacts the bioavailable Fe supply. However, this phenomenon has not been studied in other important terrestrial Fe sources, where weathering regimes and source geology vary. Here, we use Fe X-ray absorption spectroscopy on marine sediment cores to show that major global dust and sediment sources impacted by high physical weathering contain abundant primary minerals and thus are overlooked as a source of highly bioavailable Fe globally. Thus, it is important to consider the role of physical versus chemical weathering in Fe fertilization and biotic CO2 cycling.
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