Nitrogen Losses and Nutrient Regeneration in Oxygen Minimum Zones
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Other Titles: | Stickstoffverluste und Nährstoffregeneration in Sauerstoffminimumzonen | Authors: | Kalvelage, Tim | Supervisor: | Kuypers, Marcel M. M. | 1. Expert: | Kuypers, Marcel M. M. | Experts: | Bange, Hermann W. | Abstract: | In the tropical oceans, coastal upwelling of nutrient-rich deep waters fuels high surface productivity. The decomposition of sinking algal biomass results in the formation of large oxygen-deficient water bodies at mid depths (~100 1,000 m). Although, these oxygen minimum zones (OMZs) amount to <1% of the global ocean volume, they account for ~30-50% of total oceanic nitrogen (N) loss. Anammox, the anaerobic oxidation of NH4 with NO2- to gaseous N2 is the major N-loss pathway in OMZs. The recirculation of N-deficient waters to the surface limits phytoplankton growth and thus carbon sequestration in large parts of the tropical oceans. Continuing ocean de-oxygenation is expected to result in significantly increasing N-losses, thereby reducing the ocean s capacity to attenuate rising atmospheric CO2. This thesis aimed to determine regulatory effects of O2 and organic matter availability on anammox and N-linked processes in OMZs to facilitate model-based assessments of future ocean changes. |
Keywords: | oxygen minimum zone; nitrogen loss; anammox; denitrification; nitrification; organic matter; export production; microbial respiration; nitrogen cycle; oxygen sensitivity; Benguela upwelling; Peruvian upwelling | Issue Date: | 27-Jul-2012 | Type: | Dissertation | Secondary publication: | no | URN: | urn:nbn:de:gbv:46-00102781-14 | Institution: | Universität Bremen | Faculty: | Fachbereich 05: Geowissenschaften (FB 05) |
Appears in Collections: | Dissertationen |
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