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Simon Wett

  • Tel: +49 (0)421 218-62159
  • Fax: +49 (0)421 218-62165
  • Email: simon.wett [at] uni-bremen.de

Research Interests

  • Variability of the Atlantic Meridional Overturning Circulation (AMOC) in the subpolar North Atlantic
  • Deep convection in the Labrador and Irminger Seas
  • Formation and transport of watermasses in the subpolar North AtlanticEvaluation of ship- and satellite-based observational data as well as high-resolution ocean models
PhD Projekt


The Atlantic Meridional Overturning Circulation (AMOC) is the main driver of northward oceanic volume and heat transport in the Atlantic. Due to its definition via the streamfunction the exact calculation of the AMOC requires knowledge of the full velocity field. Since the early 2000s, hydrographic sections across the Atlantic at 47 deg North and continuous current measurements from moored instruments at specific locations are available. From these observations AMOC components can be estimated. However, the spatial resolution of current measurements is coarse and shipbased hydrographic sections are mostly done only once a year. Also, the observational timeseries still remain too short to come to conclusions about decadal trends in the AMOC variability. Thus, today our knowledge about the role of the AMOC in the global climate system is mainly based on model simulations. Comparing these model simulations against observations remains an important task to accurately predict the future of the AMOC and adapt to changes.

This project will conduct a comparison of the AMOC in the North Atlantic from observations at 47 deg North and a high-resolution ocean model. This comparison will help assessing different methods of estimating the AMOC strength from observations. Another part of the analysis will focus on the role of Labrador Sea Water (LSW) formation, a main component of the AMOC. Changes in LSW formation have repercussions for the AMOC: in most ocean-ice and climate models, a stronger LSW ventilation is related to larger than normal air-sea heat flux anomalies over the subpolar North Atlantic and to an increased AMOC transport. This project will test this hypothesis in observations and high-resolution ocean models.
Curriculum Vitae  
since 09/2019 Scientist (PhD student), Institute of Environmental Physics and MARUM – Center for Marine Environmental Sciences, University of Bremen, Germany
2015-2019 Studies in Physical Oceanography, Universität Hamburg, Degree: M.Sc.
2012-2015 Studies in Geophysics/Oceanography, Universität Hamburg, Degree: B.Sc.
Projects  
since 09/2019 Member of the international Research Training Group ArcTrain
since 10/2019 Member of the Bremen International Graduate School for Marine Sciences GLOMAR
Publications
Wett, S., 2018. The Impacts of Sudden Stratospheric Warmings on the Subpolar North Atlantic, Master’s Thesis, Universität Hamburg
Jochumsen, K., D. Hainbucher, L. Umlauf, J. Carpenter, H. Mashayekh Poul, R. North, P. Holtermann, J. Dräger-Dietel, A. Welsch, T. Heene, M. Sass, M. Specht, S. Wett, A. Rochner, A. Wünsche, M. Rotermund, L. Schultze, L. Zeigermann, T. Wasilewski, N. Verch, C. Gillner, S. Shilongo, and A. Raeke, 2017. Submesoscale dynamics at the Benguela eastern boundary upwelling system - frontal instabilities, mixed layer eddies and upwelling filaments, Cruise No. M132, 15th November - 11th December 2016, Walvis Bay - Cape Town. METEOR-Berichte, Gutachterpanel Forschungsschiffe, doi:10.2312/cr_m132
Kieke, D., W. Böke, S. Büttner, K. Bulsiewicz, C. Danek, T. Hempel, D. Khordakova, B. Mirau, A. Rochner, A. Roessler, N. Rohlfs, A. Schneehorst, R. Steinfeldt, P. Sültenfuß, H.-H. Uhde, S. Wett, K. Wiegand, and F. Wischnewski, 2018. Subpolar Gyre Variability, Cruise No. MSM53, March 31 - May 09, 2016, Kiel (Germany) - St. John's (Canada). MARIA S. MERIAN-Berichte, DFG-Senatskommission für Ozeanographie, doi:10.2312/cr_msm53.
Kieke, D., R. Barbosa Primon, K. Bulsiewicz, C. Gjerdrum, K. Jochumsen, J. Meyerjürgens, M. Moritz, V. Müller, C. Rieper, A. Rochner, P. Sültenfuß, L. Tiemann, E. Varotsou, A. Welsch, S. Wett, K. Wiegand, J. Winkel, and F. Wischnewski, 2016. FLEPVAR 2015 (Variability in Flemish Pass), Cruise No. MSM42, May 2 - May 22, 2015 - Bermuda - St. John's (Canada). MARIA S. MERIAN-Berichte, DFG-Senatskommission für Ozeanographie, doi:10.2312/cr_msm42.
Wett, S., 2015. Estimating the Wind Energy Input into the Ocean from Satellite Measurements (in German), Bachelor’s Thesis
Participation in Scientific Cruises
RV Meteor, M164 Subpolar North Atlantic Jun - Jul 2020 Emden, Germany - Emden, Germany
RV Maria S. Merian, MSM-76 Denmark Strait and Greenland Shelf Jun - Aug 2018 Reykjavik, Iceland - Logyearbyen, Norway
RV Meteor, M132 Benguela Upwelling System Nov - Dec 2016 Walvis Bay, Namibia - Capetown, South Africa
RV Maria S. Merian, MSM-53 Subpolar North Atlantic Mar - May 2016 Kiel, Germany - St. John's, Canada
RV Maria S. Merian, MSM-42 Newfoundland Basin May 2015 Bemuda - St. John's, Canada