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Multiple sources of soluble atmospheric iron to Antarctic waters


Winton, VHL and Edwards, R and Delmonte, B and Ellis, A and Andersson, PS and Bowie, A and Bertler, NAN and Neff, P and Tuohy, A, Multiple sources of soluble atmospheric iron to Antarctic waters, Global Biogeochemical Cycles, 30, (3) pp. 421-437. ISSN 0886-6236 (2016) [Refereed Article]


Copyright Statement

2016. American Geophysical Union.

DOI: doi:10.1002/2015GB005265


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 source. The fractional solubility of Fe is an important variable determining Fe availability for biological uptake. To constrain aerosol Fe inputs to the Ross Sea region, fractional solubility of Fe was analyzed in a snow pit from Roosevelt Island, eastern Ross Sea. In addition, aluminum, dust, and refractory black carbon (rBC) concentrations were analyzed, to determine the contribution of mineral dust and combustion sources to the supply of aerosol Fe. We estimate exceptionally high dissolved Fe (dFe) flux of 1.2  10−6 g m−2 y−1 and total dissolvable Fe flux of 140  10−6 g m−2 y−1 for 2011/2012. Deposition of dust, Fe, Al, and rBC occurs primarily during spring-summer. The observed background fractional Fe solubility of ~0.7% is consistent with a mineral dust source. Radiogenic isotopic ratios and particle size distribution of dust indicates that the site is influenced by local and remote sources. In 2011/2012 summer, relatively high dFe concentrations paralleled both mineral dust and rBC deposition. Around half of the annual aerosol Fe deposition occurred in the austral summer phytoplankton growth season; however, the fractional Fe solubility was low. Our results suggest that the seasonality of dFe deposition can vary and should be considered on longer glacial-interglacial timescales.

Item Details

Item Type:Refereed Article
Keywords:atmosphere, iron, sources, Antarctic waters
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Bowie, A (Associate Professor Andrew Bowie)
ID Code:108914
Year Published:2016
Funding Support:Australian Research Council (FT130100037)
Web of Science® Times Cited:4
Deposited By:Oceans and Cryosphere
Deposited On:2016-05-10
Last Modified:2017-11-17
Downloads:20 View Download Statistics

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