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International Indian Ocean Expedition: Fifty years down the 110 degrees East line

Beckley, L.E. (2013) International Indian Ocean Expedition: Fifty years down the 110 degrees East line. In: AMSA2013 Golden Jubilee Conference, 7 - 11 July, Gold Coast, Qld, Australia.


Australia made a significant contribution to the International Indian Ocean Expedition (IIOE) during the 1960s by regularly occupying the 110oE line with the vessels, Gascoyne and Diamantina. Arising from this, the studies on particulate carbon, chlorophyll, primary production, zooplankton and micro-nekton remain some of the only in situ biological data available for this oceanic region. We propose to commemorate the 50th anniversary of the IIOE by revisiting the 110oE line in a new ship with an international, multi-disciplinary team and apply modern technology, contemporary insights and modelling to investigate the physical, biogeochemical and biological processes in this region. The overall aim is to compare and contrast the properties of the water column with the benchmark data of the 1960s while including more biogeochemical parameters, gene diversity of the microbial community, trophic linkages and modelling. We plan to characterise the broad-scale zonal and vertical structure of the eastward flows and explore the impact of ocean physics on the biogeochemistry of the region. Particular focus will be on nitrogen fixation by diazotrophs, biogeography and functional gene diversity of bacteria, archaea and pico-eukaryotes, and trophic relationships between zooplankton and larvae of meso-pelagic fishes. The expected outcome of the voyage will be greatly improved understanding of the physical, biogeochemical and trophic processes across temperate, sub-tropical and tropical oceanic waters in the SE Indian Ocean. This will facilitate the development and application of coupled physical-biogeochemical models to characterize nutrient sources and sinks in this under-sampled part of Australia’s EEZ and recently claimed extended continental shelf.

Item Type: Conference Item
Murdoch Affiliation(s): School of Veterinary and Life Sciences
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