Browsing by Subject "MIOS 4"

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    Phytoplankton distribution and nitrogen dynamics in the southwest indian subtropical gyre and Southern Ocean waters
    (2011) Thomalla, S J; Waldron, H N; Lucas, M I; Read, J F; Ansorge, I J; Pakhomov, E
    During the 1999 Marion Island Oceanographic Survey (MIOS 4) in late austral summer, a northbound and reciprocal southbound transect were taken along the Southwest Indian and Madagascar Ridge, between the Prince Edward Islands and 31° S. The sections crossed a number of major fronts and smaller mesoscale features and covered a wide productivity spectrum from subtropical to subantarctic waters. Associated with the physical survey were measurements of size fractionated chlorophyll, nutrients and nitrogen (NO3, NH4 and urea) uptake rates. Subtropical waters were characterised by low chlorophyll concentrations (max = 0.27.3 mg m 3 dominated by pico-phytoplankton cells (> 81%) and very low f-ratios (