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    Hidden biogeochemical anonymities under Antarctic Fast Ice

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    Reg_Stud_Mar_Sci_31_100789a.pdf (551.4Kb)
    Date
    2019
    Author
    Shetye, S.S.
    Mohan, R.
    Patil, S.
    Jawak, S.
    Nair, Abhilash
    Warrier, A.K.
    Badnal, M.
    Shirodkar, R.
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    Abstract
    Climate change is negatively affecting the extent of summer sea ice and the global oceanic oxygen concentrations, it is therefore imperative to decipher the life processes under the Antarctic fast ice. The biogeochemical parameters like dissolved oxygen, inorganic carbon, macronutrients, phytoplankton, and chlorophyll a (Chl a) were studied under the fast ice (by drilling ~1.8 m thick ice) around Larsemann Hills, East Antarctica during India’s Scientific Expedition to Antarctica (31- ISEA-2011/12 and 33ISEA-2013/14). The waters under ice cover were characterized by hyperoxia (up to 10.6 ml/L). Macronutrient concentrations under sea ice were depleted (<0.1 µM NO3, PO4 and <2 µM SiO4); this could be ascribed to the nutrient demand from under ice algae. The water under the ice cover exhibited higher algal biomass (Chl a up to 6.1 mg/m3 ) and CO2 under saturation (pCO2 <10 µatm). This is reflected through the Spearman rank correlation indicating a negative correlation between Chl a and pCO2 (r = -0.41). The strong negative correlation between dissolved oxygen and pCO2 (r = -0.67) suggests that photosynthesis regulates the concentrations of both these climatically important gases. The waters under the sea ice cover had brownish mucilaginous aggregates comprised of tube-forming diatoms Berkeleya adelienses and Nitzschia lecointei. These unusual biogeochemical changes were seen only at the ice water interface, and not at deeper depths. This study suggests that with global warming and sea ice melting, Antarctica might witness phytoplankton community shifts.
    URI
    https://doi.org/10.1016/j.rsma.2019.100789
    http://drs.nio.org/drs/handle/2264/8200
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