Titel: The South Indian Ocean - Biogeochemical studies on water masses, nutrient and stable isotope distribution, and particulate matter in an oligotrophic ocean region
Sonstige Titel: Der Süd-Indische Ozean - Biogeochemische Studien zu Wassermassen, Nährstoff- und Isotopenverteilung und partikulärem Material in einer oligotrophen Meeresregion
Sprache: Englisch
Autor*in: Harms, Natalie Carina
Schlagwörter: Indian Ocean subtropical gyre; Nutrients and stable isotopes; Water masses; Sinking particles and particulate organic matter; Sediment trap moorings; Surface sediments
Erscheinungsdatum: 2020
Tag der mündlichen Prüfung: 2021-02-03
Zusammenfassung: 
This thesis presents biogeochemical element cycling processes in the less explored oligotrophic subtropical gyre of the South Indian Ocean. A detailed water mass analysis was conducted by using physical water column profiles that were basis to understand the complex distribution of nutrients and stable isotope signals in order to identify the sources and transformation processes in the nitrogen cycle. Furthermore, a five-year sediment trap experiment (2015-2019) was carried out in order to assess the particulate organic carbon (POC) export below the euphotic zone, further into the ocean interior, and its final accumulation in the deep-sea sediments. This constitutes to the organic carbon pump and is a central part of the global carbon cycle. Thus, these investigations contribute to the baseline knowledge on nitrogen and carbon cycle processes and its budgets in oligotrophic areas that are most likely expand under global warming and thus getting even more important on a global scale during the next decades.
URL: https://ediss.sub.uni-hamburg.de/handle/ediss/8845
URN: urn:nbn:de:gbv:18-ediss-90388
Dokumenttyp: Dissertation
Betreuer*in: Emeis, Kay-Christian
Lahajnar, Niko
Enthalten in den Sammlungen:Elektronische Dissertationen und Habilitationen

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