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Broad-scale predictability of carbohydrates and exopolymers in Antarctic and Arctic sea ice

Underwood, GJC and Aslam, SN and Michel, C and Niemi, A and Norman, L and Meiners, KM and Laybourn-Parry, J and Paterson, H and Thoma, DN (2013) 'Broad-scale predictability of carbohydrates and exopolymers in Antarctic and Arctic sea ice.' Proceedings of the National Academy of Sciences of the United States of America, 110 (39). 15734 - 15739. ISSN 0027-8424

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Abstract

Sea ice can contain high concentrations of dissolved organic carbon (DOC), much of which is carbohydrate-rich extracellular polymeric substances (EPS) produced by microalgae and bacteria inhabiting the ice. Here we report the concentrations of dissolved carbohydrates (dCHO) and dissolved EPS (dEPS) in relation to algal standing stock [estimated by chlorophyll (Chl) a concentrations] in sea ice from six locations in the Southern and Arctic Oceans. Concentrations varied substantially within and between sampling sites, reflecting local ice conditions and biological content. However, combining all data revealed robust statistical relationships between dCHO concentrations and the concentrations of different dEPS fractions, Chl a, and DOC. These relationships were true for whole ice cores, bottom ice (biomass rich) sections, and colder surface ice. The distribution of dEPS was strongly correlated to algal biomass, with the highest concentrations of both dEPS and non-EPS carbohydrates in the bottom horizons of the ice. Complex EPS was more prevalent in colder surface sea ice horizons. Predictive models (validated against independent data) were derived to enable the estimation of dCHO concentrations from data on ice thickness, salinity, and vertical position in core. When Chl a data were included a higher level of prediction was obtained. The consistent patterns reflected in these relationships provide a strong basis for including estimates of regional and seasonal carbohydrate and dEPS carbon budgets in coupled physical- biogeochemical models, across different types of sea ice from both polar regions.

Item Type: Article
Subjects: Q Science > QR Microbiology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 17 Sep 2013 14:42
Last Modified: 30 Jan 2019 16:18
URI: http://repository.essex.ac.uk/id/eprint/7743

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