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Ilmar Leimann

  • Tel: +49 (0)421 218-62163
  • Fax: +49 (0)421 218-62165
  • Email: ileimann [at] uni-bremen.de
PhD Project
Internal Wave Energy Dissipation and Wavenumber Spectra: Adaptive Sampling in the Ocean Interior
Ocean mixing is an important process for sustaining ocean stratification and circulation. Breaking of internal waves creates conditions in which turbulent mixing is enhanced. Still, mixing is yet poorly represented in ocean models and needs to be parameterized, and these parameterizations (e.g. IDEMIX) rely on the spectral properties of internal wave energy. Observational data of internal wave energy spectra and the distribution of mixing are, however, sparse - particularly in the deep ocean. My project aims to reduce this gap, which is a small yet crucial step towards energy consistent climate modeling.
Specifically, I target three main goals:
(i) Observing and describing the internal wave energy spectrum in the interior ocean (with a focus on the Eastern South Atlantic),
(ii) charting and analyzing the spatial distribution of energy dissipation in the deep ocean, also in reference to (i), and
(iii) exploring and co-developing new (adaptive) techniques to obtain microstructure observations
in the deep ocean using autonomous vehicles.
The project is part of the Collaborative Research Centre 181 "Energy Transfers in Atmosphere and Ocean" (TRR181). Learn more about the sub-projects I'm involved in here (W5) and here (L3).
Curriculum Vitae  
since 09/2022 PhD student at Center for Marine Environmental Sciences (MARUM) and Institute for Environmental Physics (IUP), University of Bremen, Germany
2022 M.Sc. in Climate Physics, Christian-Albrechts-Universität zu Kiel
2019 B.Sc. in Physik des Erdsystems, Christian-Albrechts-Universität zu Kiel
Projects  
since 09/2022 Internal Wave Energy Dissipation and Wavenumber Spectra: Adaptive Sampling in the Ocean Interior (sub-project W5 & L3 in TRR181)
Publications
Leimann, I., 2022. Temporal and spatial variability of the Deep Western Boundary Current. Master’s Thesis, Christian Albrechts University Kiel.
Kieke, D., K. Bulsiewicz, C. Gapp, Y. Hinse, O. Huhn, B. Holanda, A. Hunkemöller, S. Kinne, M. Köllner, L. Krisztian, O. Krüger, I. Leimann, M. Pöhlker, A. Schneehorst, A. Smirnov, R. Steinfeldt, M. Stelzner, J. Stiehler, T. Svensson, S. Wett, and K. N. Wiegand (2021), AMOC Components at 47°N, Cruise No. M164 (GPF-19-1-105), June 23 - July 31, 2020, Emden (Germany) - Emden (Germany), METEOR-Berichte, Gutachterpanel Forschungsschiffe, doi:10.48433/cr_m164.
Visbeck. M, A. Lopes Brum, J. Carbajal, O. Dada, J. Galetti, E. Gonzales, P. Handmann, J. Herrford, M. Hundsdörfer, C. Jahr, G. Krahmann, I. Leimann, R. Link, P. Michaelis, N. Niebaum, U. Papenburg, L. Sarmiento Trujillo, C. Schmidt, M. Stelzner, L. Stramma, C. Trahms, R. Witt (2019), Circulation off Brazil, Cruise No. M159, October 29 - November 20, 2019, Recife (Brazil) - Mindelo (Cape Verde), METEOR-Berichte, Gutachterpanel Forschungsschiffe, doi: 10.2312/cr_m159.
Kieke, D., K. Bulsiewicz, I. Deschepper, O. Huhn, M. Kastens, A. Kersting, M. Köllner, L. Krisztian, I. Leimann, B. Mirau, M. Moritz, N. Rohlfs, A. Schneehorst, R. Steinfeldt, I. Stendardo, J. Stiehler, and R. Tao (2020), Long-term observations of the Atlantic Meridional Overturning Circulation, Cruise No. MSM83, May 17 - June 15, 2019, Las Palmas (Spain) - St. John's (Canada). MARIA S. MERIAN- Berichte, Gutachterpanel Forschungsschiffe, doi:10.2312/cr_msm83.
Leimann, I., 2019. Mesoscale eddies on the Labrador Sea and their particle distribution. Bachelor’s Thesis, Christian Albrechts University Kiel.
Karstensen J., D. Atamanchuk, A. Barboni, A. Bendinger, D. Fonseca, N. Fried, P. Holliday, M. Hundsdörfer, L. Kerrigan, I. Leimann, C. Normandeau, M. Oltmanns, N. v. Oppeln-Bronikowski, J. Ribbe, S. Schmidtko, T. Suits, C. Willis (2019), Water mass transport and transformation in the western SPNA, Cruise No. MSM74, May 25 - June 26, 2018, St. John's (Canada) - Reykjavik (Iceland), Western SPNA transport.). MARIA S. MERIAN-Berichte, Gutachterpanel Forschungsschiffe, doi:10.2312/cr_msm74.
Participation in Scientific Cruises
RV Meteor, M164 Subpolar North Atlantik Jun - Jul 2020 Emden, Germany - Emden, Germany
RV Meteor, M159 South Atlantic Oct - Nov 2019 Recife, Brazil - Mindelo, Cape Verde
RV Maria S. Merina, MSM83 Subpolar North Atlantic Mar - Jun 2019 Las Palmas, Spain - St. John's, Canada
RV Poseidon, POS530 Baltic Sea Oct 2018 Kiel, Germany - Kiel, Germany
RV Maria S. Merian, MSM74 Subpolar North Atlantic Mar - Jun 2018 ST. John's, Canada - Reykjavik, Iceland