[IIOE-EP23] Influence of Indian Ocean sector of the Southern ocean dynamics and biogeochemistry on the Tropical weather and climate

Cruise No. EP23-1

Period of Cruise: 09 December, 2017 - 07 February, 2018

Chief Scientist: Sarat Chandra Tripathy, NCAOR .  

This 60-day multi-institutional endeavour is the 10^th Expedition to be carried out under the aegis of India’s Ministry of Earth Sciences and the National Centre for Antarctic and Ocean Research, since 2004. The present cruise includes meridional and zonal transects within the Antarctic Zone, focusing on data collection and observations related to atmospheric sciences, water column dynamics, biogeochemistry, food-web dynamics and paleoclimatology. Studies on atmospheric sciences are directed towards observations on momentum and turbulent flux, characterization of aerosol and its contribution to radiative forcing as well as studies with special reference to oceanic volatiles and their impact on atmospheric halogens and cloud forming aerosols. The studies on water column dynamics include (i) the thermohaline structure between the Southern Boundary of Antarctic Circumpolar Current and coastal waters of Antarctica, (ii) ocean heat content variability, (iii) current variability, and (iv) physical forcing on biological production. The studies on carbon biogeochemistry are focused on (i) ¹⁴C, ¹³C and Fast Repetition Rate Fluorometry-based primary production, (ii) measurements of coloured dissolved organic matter (CDOM), (iii) phytoplankton pigments and taxonomy, (iv) zooplankton biomass, abundance and taxonomy, (v) macro-nutrients dynamics, (vi) microbial uptake rates of organic carbon, (vii) organic carbon inventory (total organic carbon, particulate organic carbon, carbohydrates) and (viii) p_CO2 measurements.

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