EreBUS: Processes Controlling Greenhouse Gas Emmissions from the Benguela Upwelling System, Cruise No. 148/2, July 2 - July 20, 2018, Walvis Bay (Namibia) - Las Palmas de Gran Canaria (Spain) (English)

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A principal objective of the Meteor transit Expeditions M148/2 "EreBUS" was to determine the formation and consumption of the trace greenhouse gases N2O and CH4 in surface sediments and the water column of the Benguela Upwelling. The water column and surface sediment was extensively sampled within the near-shore, shelf regions of Namibia and continental margin, as well as the the euphotic water column within the oligotrophic Angola Gyre. We took samples and performed experiments to quantify processes and identify microbial communities contributing to TGG turnover at key water and surface sediment depths, and explore the metabolic capacities of these microorganisms with state-of-art cultivation, metagenomics, metatranscriptomic techniques. A further objective was to examine the physical oceanography as well as the dissolved organic matter and trace element distributions may regulate key enzymatic processes leading to production or consumption of TGG in the Benguela Upwelling System. We also measured primary productivity and N2 fixation in the near-shore regions and the Angola Gyre that feeds into the Benguela Upwelling system.