I am a physical oceanographer working mostly with observations from high latitudes. My current research focuses on water mass transformation through air-ice-sea interaction leading to dense-water formation and on the pathways of this dense water toward the overflows across the Greenland-Scotland Ridge. In particular, I'm studying the structure, volume transport, variability, and dynamics of the boundary currents in the Nordic Seas that sustain the lower limb of the Atlantic Meridional Overturning Circulation. I have also worked with tidal currents and their seasonal enhancement by continental shelf waves in Antarctica.
Outreach piece about Semper et al. (2022):
Following the Gulf Stream's little finger
Outreach piece about Våge et al. (2022):
Four decades of change
Glider operations on a research cruise in Baffin Bay in 2021:
Odin glides by Greenland
Feature on our wintertime field campaign in the Iceland and Greenland Seas in 2018 by NRK journalist Sindre Skrede:
Det vanskelige havet
- GEOF105 Physics of the Atmosphere and Ocean (autumn 2023)
Spall, M.A., Semper, S., and Våge, K. (accepted): Mechanisms of offshore solid and liquid freshwater flux from the East Greenland Current, Journal of Physical Oceanography, https://doi.org/10.1175/JPO-D-23-0120.1.
Renfrew, I.A., Huang, J., Semper, S., Barrell, C., Terpstra, A., Pickart, R.S., Våge, K., Elvidge, A.D., Spengler, T., Strehl, A., and Weiss, A. (2023): Coupled atmosphere-ocean observations of a cold air outbreak and its impact on the Iceland Sea, Quarterly Journal of the Royal Meteorological Society, 149, 472-493, https://doi.org/10.1002/qj.4418.
Semper, S., Glessmer, M.S., Våge, K., and Pickart, R.S. (2022): How warm Gulf Stream water sustains a cold underwater waterfall, Frontiers for Young Minds, 10:765740. doi: 10.3389/frym.2022.765740.
Våge, K., Semper, S., Valdimarsson, H., Jónsson, S., Pickart, R.S., and Moore, G.W.K. (2022): Water mass transformation in the Iceland Sea: Contrasting two winters separated by four decades, Deep-Sea Research I: Oceanographic Research Papers, 103824, https://doi.org/10.1016/j.dsr.2022.103824.
Semper, S., Våge, K., Pickart, R.S., Jónsson, S., and Valdimarsson, H. (2022): Evolution and transformation of the North Icelandic Irminger Current along the north Iceland shelf, Journal of Geophysical Research: Oceans, 127, e2021JC017700, https://doi.org/10.1029/2021JC017700.
Semper, S., Pickart, R.S., Våge, K., Larsen, K.M.H., Hátún, H., and Hansen, B. (2020): The Iceland-Faroe Slope Jet: a conduit for dense water toward the Faroe Bank Channel overflow, Nature Communications, 11, 5390, https://doi.org/10.1038/s41467-020-19049-5.
Renfrew, I.A. and 65 others (2019): The Iceland Greenland Seas Project, Bull. Amer. Meteor. Soc., 100, 1795–1817, https://doi.org/10.1175/BAMS-D-18-0217.1.
Semper, S., Våge, K., Pickart, R.S., Valdimarsson, H., Torres, D.J., and Jónsson, S. (2019): The emergence of the North Icelandic Jet and its evolution from northeast Iceland to Denmark Strait, Journal of Physical Oceanography, 49, 2499-2521, https://doi.org/10.1175/JPO-D-19-0088.1.
Zhao, J., Yang, J., Semper, S., Pickart, R.S., Våge, K., Valdimarsson, H., Jónsson, S. (2018): A numerical study of interannual variability in the North Icelandic Irminger Current, Journal of Geophysical Research: Oceans, 123, https://doi.org/10.1029/2018JC013800.
Bertler, N.A.N. and 70 others (2018): The Ross Sea Dipole – temperature, snow accumulation and seaice variability in the Ross Sea region, Antarctica, over the past 2700 years, Climate of the Past, 14 (2), 193, https://doi.org/10.5194/cp-14-193-2018.
Pyne, R., Keller, E., Canessa, S., Bertler, N., Pyne, A., Mandeno, D., Vallelonga, P., Semper, S., Kjær, H., Hutchinson, E., Baisden, T. (2018): A Novel Approach to Process Brittle Ice for Continuous Flow Analysis of Stable Water Isotopes, Journal of Glaciology, 64, 244, 289–99, https://doi.org/10.1017/jog.2018.19.
Semper, S. and Darelius, E. (2017): Seasonal resonance of diurnal coastal trapped waves in the southern Weddell Sea, Antarctica, Ocean Science, 13(1), 77-93, https://doi.org/10.5194/os-13-77-2017.
My current project, Supply of dense water to the overflows across the Greenland-Scotland Ridge (SUPERFLOW), is funded by a Marie Skłodowska-Curie Actions Individual Fellowship under the European Union's Horizon 2020 research and innovation programme.
- Ph.D. Physical Oceanography
University of Bergen, Norway, 2020
- M.Sc. Climate Dynamics (Meteorology and Oceanography)
University of Bergen, Norway, 2015
- B.Sc. Physics of the Earth: Meteorology - Oceanography - Geophysics
University of Kiel, Germany, 2013
03/2023-08/2023 Co-supervision of M.Sc. student Erika Giorgi (University of Utrecht, Netherlands); Guided Research Project: “Circulation and interbasin exchange at mid-depth in the Nordic Seas from Argo floats”
08/2022-06/2023 Co-supervision of M.Sc. student Thorbjørn Ø. Moe (University of Bergen, Norway); Master’s thesis: “Idealized modeling of the North Icelandic Jet”
08/2020-03/2021 Co-supervision of M.Sc. student Linda Latuta (Technical University of Denmark, Denmark); Master’s thesis: “Role of air-sea interaction in convection: a case-study in the northwestern Iceland Sea”
09/2018-03/2020 Co-supervision of M.Sc. student Silje Skjelsvik (University of Bergen, Norway); Master’s thesis: "Two-year moored records of dense-water production and flow through a gap in the Mid-Atlantic Ridge north of Iceland"