Bange, Hermann W. (2024) Biogeochemistry/atmosphere processes in the Bay of Bengal: A contribution to the 2nd International Indian Ocean Expedition, Cruise No. SO305 [SO305/1], 10 April - 22 May 2024, Colombo (Sri Lanka) - Singapore (Singapore), BIOCAT-IIOE2. . Sonne-Berichte, SO305 . UNSPECIFIED, Bonn, 86 pp. DOI 10.48433/cr_so305.

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Abstract

The overarching goal of SO305 BIOCAT-IIOE2 was to quantify key (micro)biological processes
in the water column and ocean/atmosphere exchange fluxes to assess their impacts on the oxygen
minimum zone (OMZ) of the Bay of Bengal. To this end, we conducted a measurement campaign
with the research vessel (RV) SONNE from 10 April to 22 May 2024 (SO305) as part of the
BIOCAT-IIOE2 project, covering the main carbon and nitrogen cycle processes and physical
processes in the water column. The oceanic measurements were complemented by an intensive
atmospheric measurement program to investigate the effects of atmospheric inputs on water
column processes. During SO305 the GEOMAR Helmholtz Centre for Ocean Research Kiel, the
University of Hamburg, the Helmholtz Centre Hereon (Geesthacht), the Leibniz Institute for
Tropospheric Research (TROPOS, Leipzig), the University of Oldenburg and the University of
Southern Denmark (SDU, Odense, DK) were collaborating. A team of 39 scientists, students and
technicians made measurements in the water column and in the atmosphere at 33 regular CTD
stations and five 24h-stations along a cruise track from the eastern equatorial Indian Ocean to the
central Bay of Bengal. The results of SO305 BIOCAT-IIOE2 will contribute to a significantly
improved assessment of the future impacts of global climate change and pollution for the
ecosystems and the OMZ of the Bay of Bengal.

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