Publications by authors named "Rachel U Shelley"
Article Synopsis
- Atmospheric dust is a key source of the micronutrient iron (Fe) for the oceans, with a focus on the role of both mineral and soluble anthropogenic sources.
- Research presented includes iron isotope data from aerosol samples in the North Atlantic, revealing different isotope signatures tied to different regions, particularly highlighting the uniqueness of aerosols from North America and Europe.
- The findings suggest that current estimates of soluble anthropogenic Fe flux to the oceans may be considerably lower than actual levels, especially in areas like the dusty North Atlantic.
Atmospheric deposition is a source of potentially bioavailable iron (Fe) and thus can partially control biological productivity in large parts of the ocean. However, the explanation of observed high aerosol Fe solubility compared to that in soil particles is still controversial, as several hypotheses have been proposed to explain this observation. Here, a statistical analysis of aerosol Fe solubility estimated from four models and observations compiled from multiple field campaigns suggests that pyrogenic aerosols are the main sources of aerosols with high Fe solubility at low concentration.
View Article and Find Full Text PDFAerosol iron was examined in Saharan dust plumes using a combination of iron near-edge X-ray absorption spectroscopy and wet-chemical techniques. Aerosol samples were collected at three sites located in the Mediterranean, the Atlantic, and Bermuda to characterize iron at different atmospheric transport lengths and time scales. Iron(III) oxides were a component of aerosols at all sampling sites and dominated the aerosol iron in Mediterranean samples.
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