Impact of biomass burning emissions and dust on soluble iron deposition to Australian waters, the Southern Ocean and Antarctica
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The deposition of atmospheric iron to iron-limited ocean waters around Australia and Antarctica can dramatically stimulate the growth of microscopic marine plants. To date, mineral dust was assumed to be the primary source of iron to the ocean. However, only a small fraction of iron in dust is bioavailable. This study has found that Australian bushfires can indirectly increase the bioavailable iron fraction when smoke and mineral dust mix during long-range atmospheric transport to Antarctica.
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Dust to dust: Evidence for the formation of “primary” hematite dust in banded iron formations via oxidation of iron silicate nanoparticlesRasmussen, Birger; Muhling, Janet; Suvorova, A.; Krapež, Bryan (2016)Conventional models for the deposition of banded iron formations (BIFs) envisage the oxidation of upwelled ferrous iron and the precipitation of ferric oxide/hydroxide particles in surface waters that settled to form ...
The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilizationWinton, Victoria; Dunbar, G.; Atkins, C.; Bertler, N.; Delmonte, B.; Andersson, P.; Bowie, A.; Edwards, R. (2016)Summer iron (Fe) fertilization in the Ross Sea has previously been observed in association with diatom productivity, lithogenic particles and excess Fe in the water column. This productivity event occurred during an early ...
Winton, Victoria; Edwards, R.; Delmonte, B.; Ellis, A.; Andersson, P.; Bowie, A.; Bertler, N.; Neff, P.; Tuohy, A. (2016)The Ross Sea, Antarctica, is a highly productive region of the Southern Ocean. Significant new sources of iron (Fe) are required to sustain phytoplankton blooms in the austral summer. Atmospheric deposition is one potential ...