publication . Article . Other literature type . 2007

First stages of degradation of Limacina helicina shells observed above the aragonite chemical lysocline in Terra Nova Bay (Antarctica)

C. Manno; S. Sandrini; L. Tositti; A. Accornero;
Closed Access English
  • Published: 01 Nov 2007
  • Country: Italy
Abstract
Abstract The observation of badly preserved shells of the pteropod Limacina helicina in deep (880 m) sediment traps moored in the polynya of Terra Nova Bay was the first inspiration that led us to investigate the chemical and physical processes affecting the aragonitic shells of these organisms upon their death. For this purpose we determined the chemical saturation state of CaCO3 in seawater from Total Dissolved Inorganic Carbon (TCO2) and Total Alkalinity (TA) data. The results showed that the saturation level for aragonite was located at about 1000 m depth, hence below the trap level. A few lines of evidence concur to suggest aragonite dissolution above the c...
Subjects
free text keywords: LIMACINA HELICINA, ARAGONITE, ROSS SEA, DISSOLVED INORGANIC CARBON, Aquatic Science, Ecology, Evolution, Behavior and Systematics, Oceanography, Lysocline, engineering.material, engineering, biology.organism_classification, biology, Carbonate, chemistry.chemical_compound, chemistry, Water column, Sediment trap, Geology, Mineralogy, Seawater, Total inorganic carbon
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publication . Article . Other literature type . 2007

First stages of degradation of Limacina helicina shells observed above the aragonite chemical lysocline in Terra Nova Bay (Antarctica)

C. Manno; S. Sandrini; L. Tositti; A. Accornero;