UVA variability overrules UVB ozone depletion effects on the photoreduction of iron in the Southern Ocean


Rijkenberg, Micha J.A., Gerringa, Loes J.A., Neale, Patrick J., Timmermans, Klaas R., Buma, Anita G.J. and de Baar, Hein J.W. (2004) UVA variability overrules UVB ozone depletion effects on the photoreduction of iron in the Southern Ocean. Geophysical Research Letters, 31, (24), L24310. (doi:10.1029/2004GL020829).

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Original Publication URL: http://dx.doi.org/10.1029/2004GL020829

Description/Abstract

A spectral weighting function describing the wavelength dependency of the photoproduction of Fe( II) in Antarctic seawater was established. The strong wavelength-dependent photoproduction of Fe( II) from amorphous ferric hydroxides can be described as an exponential function: epsilon(lambda) = 3.57 . 10(3) . e (-0.02)((lambda-300)). Solar spectra recorded during the 2000 Antarctic ozone depletion season were used to demonstrate that daily and seasonal variability of the ultraviolet A ( UVA: 315-400 nm) and the visible part of the light spectrum
(VIS: 400-700 nm) dominates Fe( II) production rates in surface waters ( respectively > 60% and about 30%) and in the water column. Although ultraviolet B ( UVB: 280-315 nm) is the most effective wavelength region for Fe( II) photoproduction, the impact of UVB was small due to the relatively low flux of UVB into the ocean surface waters. However, the impact of UVB did indeed increase significantly from 3.54 to 6.15 % during the austral ozone minimum.

Item Type: Article
ISSNs: 0094-8276 (print)
Related URLs:
Keywords: ultraviolet-radiation, equatorial pacific, waters, photosynthesis, phytoplankton, inhibition, seawater, ice
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 41429
Date Deposited: 12 Sep 2006
Last Modified: 27 Mar 2014 18:26
URI: http://eprints.soton.ac.uk/id/eprint/41429

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