- Info
Profile
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Research interests
- Deep-Sea Landscapes – Fluid Dynamics and Sediment Geochemistry
The sediment-covered seafloor in the deep sea is topographically structured on spatial scales of millimeters (e.g. animal burrows) up to thousands of kilometers (continental margins, abyssal plains, mid-ocean ridges). For these very small and very large scales the impact of topographic heterogeneities on the environment has been relatively well studied. For spatial scales in the medium range of kilometers up to a few tens of kilometers, however, there is little information. On this medium space scale mainly topographic features such as abyssal hills, seamounts, fracture-zone valleys and canyons structure the global seafloor. Residual flow, tides and internal waves (tides) interact with such kilometer-scale topography. These interactions lead to hydrodynamic patterns that would not exist without the presence of these topographies and add even more structure and complexity to the environment.
From here two interdisciplinary research foci arise:
- How do flow / topography interactions vary with the topographic geometry relative to the intensity of steady inflow, stratification, geographical latitude, tidal forcing, tidal excursion, water depth and the internal-wave characteristic?
- How are these flow / topography interactions reflected in
- a) the sedimentary record?
- b) biogeochemical fluxes across the sediment-water interface?
- c) organic matter decomposition and preservation?
- d) ecosystem structure and dynamics?
At the Scottish Marine Institute I am a member of the ...
Career / education
2006-present
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Lecturer in Marine Geochemistry, SAMS
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2006
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Research Fellow, Baltic Sea Research Institute Warnemünde (IOW), Germany |
2002-2006
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Research Fellow, National Oceanography Centre, Southampton, UK |
2000-2001
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Postdoc, Rostock University, Germany
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PhD (Dr rer nat magna cum laude), IfM-GEOMAR, Germany
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MSc with distinction (Diplom mit Auszeichnung), University of Kiel, Germany
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BSc (Vordiplom), University of Kiel, Germany
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Publications
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- Turnewitsch, R., Pohl, C. (2010) An estimate of the efficiency of the iron- and manganese-driven dissolved inorganic phosphorus trap at an oxic/euxinic water column redoxcline. Global Biogeochemical Cycles 24, GB4025, doi:10.1029/2010GB003820
- Peine, F., Turnewitsch, R., Mohn, C., Reichelt, T., Springer, B.M., Kaufmann, M. (2009). The importance of tides for sediment dynamics in the deep sea – Evidence from the particulate-matter tracer 234Th in deep-sea environments with different tidal forcing. Deep-Sea Research I 56, 1182-1202.
- Forster, S., Turnewitsch, R., Powilleit, M., Werk, S., Ziervogel, K., Kersten, M. (2009). Thorium-234 derived information on particle residence times and sediment deposition in shallow waters of the south-western Baltic Sea. Journal of Marine Systems 75, 360-370.
- Turnewitsch, R., Reyss, J.-L., Nycander, J., Waniek, J, Lampitt, R.S. (2008). Internal tides and sediment dynamics in the deep sea – Evidence from radioactive 234Th/238U disequilibria. Deep-Sea Research I, 55, 1727–1747.
- Lampitt, R.S., Boorman, B., Brown, L., Lucas, M., Salter, I., Sanders, R., Saw, K., Seeyave, S., Thomalla, S.J., Turnewitsch, R. (2008). Particle export from the euphotic zone: Estimates using a novel drifting sediment trap, 234Th and new production. Deep-Sea Research I, 55, 1484-1502.
- Thomalla, S.J., Poulton, A.J., Sanders, R., Turnewitsch, R., Holligan, P., Lucas, M. (2008). Variable export fluxes and efficiencies for calcite, opal, and organic carbon in the Atlantic Ocean: A ballast effect in action? Global Biogeochemical Cycles 22, GB1010, doi:10.1029/2007GB002982.
- Morris, P.J., Sanders, R., Turnewitsch, R., Thomalla, S.J. (2007). 234Th derived particulate organic carbon export compared to new production from an island induced phytoplankton bloom in the Southern Ocean. Deep-Sea Research II 54, 2208–2232.
- Turnewitsch, R., Springer, B.M., Kiriakoulakis, K., Vilas Español, J.C., Arístegui, J., Wolff, G., Peine, F., Werk, S., Graf, G., Waniek, J. (2007). Determination of the concentration of particulate organic carbon (POC) in seawater: the relative methodological importance of artificial organic carbon gains and losses in two glass-fiber-filter-based techniques. Marine Chemistry 105, 208-228.
- Turnewitsch, R., Domeyer, B., Graf, G. (2007). Experimental evidence for an effect of early-diagenetic interaction between labile and refractory marine sedimentary organic matter on nitrogen dynamics. Journal of Sea Research 57, 270-280.
- Thomalla, S., Turnewitsch, R., Lucas, M., Poulton, A. (2006). Particulate organic carbon export from the North and South Atlantic: the 234Th/238U disequilibrium approach. Deep-Sea Research II 53, 1629-1648.
For a full list of Robert's publications, please use the search function on the right.
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Teaching
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- Module leader: Marine Pollution (year 3)
- Lecturer: Marine Conservation (year 3)
- Lecturer: Sediment Processes (year 3)
- Lecturer: Defining the Marine Carbon Cycle (year 4)
Previous PhD students (alumni)
- Paul Morris, National Oceanography Centre
- Sandy Thomalla, University of Cape Town
PostDoc
- Florian Peine (University of Rostock)
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Dr Robert Turnewitsch
E: robert.turnewitsch@sams.ac.uk
T: +44 (0)1631 559 265
F: +44 (0)1631 559 001
Scottish Marine Institute
Oban, Argyll PA37 1QA, UK
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