Collaborateurs

Jemima Rama

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Postdoctoral researcher in the Aquatic Physics group

Constraining the Physical Processes that Govern Oxygen Distribution in Lake Zug

Topographic constraints, such as sills or constrictions, play a critical role in regulating water exchange between different basins, often creating complex circulation patterns that influence the transport and distribution of sediments, nutrients, and oxygen. This study examines the inter-basin exchange in Lake Zug, where two basins, a shallow northern basin (100 m deep) and a deeper southern basin (180 m deep), are connected by a lateral constriction. Lake Zug is meromictic, remaining stratified throughout the year, with anoxic conditions prevailing below approximately 120 m. Consequently, the shallow northern basin remains well-oxygenated, while the bottom 60 m of the southern basin is characterised by anoxic water. Historical fine-scale measurements have revealed the presence of oxygen intrusions at depth, suggesting episodic oxygen supply to the anoxic zones of the southern basin.

We hypothesise that the constriction between the basins influences lateral inter-basin exchange, thereby controlling the oxygen supply from the oxic northern basin to the deep anoxic zones of the southern basin. The primary aim of this study is to identify the dynamics within each basin and determine the nature of the hydraulic control exerted by the constriction. By identifying the physical mechanisms that drive inter-basin exchange, this study seeks to clarify the factors influencing oxygen supply in the southern basin and its impact on the vertical zonation of redox processes. A combination of 3D numerical modeling and observational datasets are employed to address our research question. 

Curriculum Vitae

2019 - 2024 PhD candidate, The Australian National University, Research School of Earth Sciences, Canberra, Australia 

Thesis: The Impact of Mesoscale Flows on the Identification, Energy Partitioning, and Propagation of Near-Inertial Internal Waves
2018 Research and Development Officer, Department for Continental Shelf, Maritime Zones Administration and Exploration, Prime Minister's Office, Mauritius
2012 - 2016

MSci (combined Bachelors and Masters) in Oceanography, University of Southampton, United Kingdom

Thesis: Potential mechanisms underpinning the dissipation of mesoscale eddies over the topographic rise east of the Bahamas

2014 - 2015

1 year exchange program (final year of Bachelors), University of Washington, School of Oceanography, Seattle, USA

Thesis: Tidal flow over a sill in Muchalat Inlet, Nootka Sound and the resultant mixing processes

Adresse

E-Mail: jemima.rama@eawag.ch
Téléphone: +41 58 765 2176
Fax: +41 58 765 2168
Adresse: Eawag
Seestrasse 79
6047 Kastanienbaum
Bureau: SW C03

Groupes de recherche

Aquatic Physics 


Axes de recherche

  • 3D numerical modelling
  • Lateral transport 
  • Inter-basin exchanges
  • Turbulent mixing

Previous groups

Climate and Fluid Physics, Research School of Earth Sciences, Australian National University