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The influence of UV irradiation on the photoreduction of iron in the Southern Ocean

The influence of UV irradiation on the photoreduction of iron in the Southern Ocean
The influence of UV irradiation on the photoreduction of iron in the Southern Ocean
An iron enrichment experiment, EisenEx, was performed in the Atlantic sector of the Southern Ocean during the Antarctic spring of 2000. Deck incubations of open ocean water were performed to investigate the influence of ultraviolet B (UVB: 280-315 nm) and ultraviolet A (UVA: 315-400 nm) on the speciation of iron in seawater, using an addition of the radioisotopes Fe-59(III) (1.25 nM) or Fe-55(III) (0.5 nM). Seawater was sampled inside and outside the iron-enriched region. The radioisotopic Fe(II) concentration was monitored during daylight under three different light conditions: the full solar spectrum (total), total minus UVB, and total minus UVB+UVA. A distinct diel cycle was observed with a clear distinction between the three different light regimes. A clear linear relationship was found for the concentration of radioisotopic Fe(II) versus irradiance. UVB produced most of the Fe(II) followed by UVA and visible light (VIS: 400-700 nm), respectively. UVB produced 4.89 and 0.69 pM m(2) W-1 radioisotopic Fe(II) followed by UVA with 0.33 and 0.10 pM M-2 W-1 radioisotopic Fe(II) and VIS with 0.04 and 0.03 pM m(2) W-1 radioisotopic Fe(II).
iron, photoreduction, UV, Southern Ocean, EisenEx
0304-4203
119-129
Rijkenberg, M.J.A.
b801d0be-bd6a-4dbf-beb0-48a777fe5b64
Fischer, A.C.
7516f49c-3aa5-430d-8136-9ab9fe6f8998
Kroon, J.J.
2def557b-5cb2-4742-b31c-95b0690241be
Gerringa, L.J.A.
740d8c6b-114c-4432-9f71-380fd9965179
Timmermans, K.R.
120289fc-76b3-4331-acd8-f6c21f8ac2df
Wolterbeek, H.Th.
532522ba-2c39-43e3-8cba-e2dde45a2f1f
de Baar, H.J.W.
c23aa060-a4a6-4fb6-a4ed-892b022d2410
Rijkenberg, M.J.A.
b801d0be-bd6a-4dbf-beb0-48a777fe5b64
Fischer, A.C.
7516f49c-3aa5-430d-8136-9ab9fe6f8998
Kroon, J.J.
2def557b-5cb2-4742-b31c-95b0690241be
Gerringa, L.J.A.
740d8c6b-114c-4432-9f71-380fd9965179
Timmermans, K.R.
120289fc-76b3-4331-acd8-f6c21f8ac2df
Wolterbeek, H.Th.
532522ba-2c39-43e3-8cba-e2dde45a2f1f
de Baar, H.J.W.
c23aa060-a4a6-4fb6-a4ed-892b022d2410

Rijkenberg, M.J.A., Fischer, A.C., Kroon, J.J., Gerringa, L.J.A., Timmermans, K.R., Wolterbeek, H.Th. and de Baar, H.J.W. (2005) The influence of UV irradiation on the photoreduction of iron in the Southern Ocean. Marine Chemistry, 93 (2-4), 119-129. (doi:10.1016/j.marchem.2004.03.021).

Record type: Article

Abstract

An iron enrichment experiment, EisenEx, was performed in the Atlantic sector of the Southern Ocean during the Antarctic spring of 2000. Deck incubations of open ocean water were performed to investigate the influence of ultraviolet B (UVB: 280-315 nm) and ultraviolet A (UVA: 315-400 nm) on the speciation of iron in seawater, using an addition of the radioisotopes Fe-59(III) (1.25 nM) or Fe-55(III) (0.5 nM). Seawater was sampled inside and outside the iron-enriched region. The radioisotopic Fe(II) concentration was monitored during daylight under three different light conditions: the full solar spectrum (total), total minus UVB, and total minus UVB+UVA. A distinct diel cycle was observed with a clear distinction between the three different light regimes. A clear linear relationship was found for the concentration of radioisotopic Fe(II) versus irradiance. UVB produced most of the Fe(II) followed by UVA and visible light (VIS: 400-700 nm), respectively. UVB produced 4.89 and 0.69 pM m(2) W-1 radioisotopic Fe(II) followed by UVA with 0.33 and 0.10 pM M-2 W-1 radioisotopic Fe(II) and VIS with 0.04 and 0.03 pM m(2) W-1 radioisotopic Fe(II).

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More information

Published date: 2005
Keywords: iron, photoreduction, UV, Southern Ocean, EisenEx

Identifiers

Local EPrints ID: 41430
URI: https://eprints.soton.ac.uk/id/eprint/41430
ISSN: 0304-4203
PURE UUID: ee5ae476-3ea8-4f46-b24f-91ce82d86b51

Catalogue record

Date deposited: 12 Sep 2006
Last modified: 15 Jul 2019 18:57

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