Universität zu Köln

Raiswell, Robert, Hawkings, Jon R., Benning, Liane G., Baker, Alex R., Death, Ros, Samuel, Albani A., Mahowald, Natalie ORCID: 0000-0002-2873-997X, Krom, Michael D., Poulton, Simon W., Wadham, Jemma and Tranter, Martyn ORCID: 0000-0003-2071-3094 (2016). Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans. Biogeosciences, 13 (13). S. 3887 - 3901. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1726-4189

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Abstract

Iceberg-hosted sediments and atmospheric dust transport potentially bioavailable iron to the Arctic and Southern oceans as ferrihydrite. Ferrihydrite is nanoparticulate and more soluble, as well as potentially more bioavailable, than other iron (oxyhydr)oxide minerals (lepidocrocite, goethite, and hematite). A suite of more than 50 iceberg-hosted sediments contain a mean content of 0.076 wt% Fe as ferrihydrite, which produces iceberg-hosted Fe fluxes ranging from 0.7 to 5.5 and 3.2 to 25 Gmoles yr(-1) to the Arctic and Southern oceans respectively. Atmospheric dust (with little or no combustion products) contains a mean ferrihydrite Fe content of 0.038 wt% (corresponding to a fractional solubility of similar to 1 %) and delivers much smaller Fe fluxes (0.02-0.07 Gmoles yr(-1) to the Arctic Ocean and 0.0-0.02 Gmoles yr(-1) to the Southern Ocean). New dust flux data show that most atmospheric dust is delivered to sea ice where exposure to melting/re-freezing cycles may enhance fractional solubility, and thus fluxes, by a factor of approximately 2.5. Improved estimates for these particulate sources require additional data for the iceberg losses during fjord transit, the sediment content of icebergs, and samples of atmospheric dust delivered to the polar regions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Raiswell, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Hawkings, Jon R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Benning, Liane G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Baker, Alex R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Death, Ros UNSPECIFIED UNSPECIFIED UNSPECIFIED Samuel, Albani A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mahowald, Natalie UNSPECIFIED orcid.org/0000-0002-2873-997X UNSPECIFIED Krom, Michael D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Poulton, Simon W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wadham, Jemma UNSPECIFIED UNSPECIFIED UNSPECIFIED Tranter, Martyn UNSPECIFIED orcid.org/0000-0003-2071-3094 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-292389
DOI:	10.5194/bg-13-3887-2016
Journal or Publication Title:	Biogeosciences
Volume:	13
Number:	13
Page Range:	S. 3887 - 3901
Date:	2016
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1726-4189
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOUTHERN-OCEAN; MINERAL DUST; ICE; SEA; SOLUBILITY; OXIDES; PHYTOPLANKTON; GREENLAND; CYCLE; BIOGEOCHEMISTRY Multiple languages Ecology; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/29238