Nitrogen and carbon processes in the South Indian Ocean and the French Southern and Antarctic Lands ...

• Main Authors: Hörstmann, Cora, Raes, Eric J, Waite, Anya M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2018
• Subjects: Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.885896; https://doi.pangaea.de/10.1594/PANGAEA.885896

Our data, as part of the OISO (Ocean Indien Service d'Observation) campaign, contributes to a better understanding of the physical and biological factors controlling N2 fixation in the Southern Indian Ocean and the French Southern and Antarctic lands during Austral summer January and February 2017.We measured N2 and C fixation as well as NH4+ and NO3- assimilation in 3-6 replicates per station. Additionally, we measured diagnostic pigment concentrations to evaluate phtosynthetic community composition.For pigment analysis 4L water was filtered through 25mm Whatman GF/F filters (pressure drop <10kPa). Samples were stored at -80°C until analysis. Pigments were analysed using High Performance Liquid Chromatography (HPLC). Pigment concentration were calculated according to Kilias et al (2013, doi:10.1111/jpy.12109).N2 fixation experiments were carried out in three to six replicates for each station. Incubations were done in pre-acid washed polycarbonate bottles on deck with ambient light conditions. All ...