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RESEARCH
My research can be split into two parts. The first one is sea-ice modelling and the
second one is investigating ocean-ice-atmosphere interactions during the Little Ice Age and the industrial era. In collaboration with Jean-Francois Lemieux, Bruno Tremblay and David Holland, we transformed the granular sea-ice model of Tremblay and Mysak (1997, J. Phys. Oceanogr.) from Cartesian to spherical coordinates and then coupled it to the global Earth System Climate Model from the University of Victoria (UVic ESCM). This work has been published in J. of Climate in Dec. 2007. With the granular model in spherical coordinates, we hope to bring some diversity into global sea-ice simulations and to address different questions which can further the understanding of the role of sea-ice dynamics in climate variability and change. The new coupled model is applied to the period of the Little Ice Age (LIA) (1500-1850) and the industrial era (1850-2000). We are particularly interested in the sea-ice and ocean behaviour and their interactions during this time period. Intuitively, the colder LIA should have had an enhanced sea-ice cover. We showed that this is indeed the case in the Northern Hemisphere where advective and thermodynamical changes are of similar magnitude. In the Southern Hemisphere, on the other hand, sea-ice advection plays a more important role and no long-term trends in the sea-ice cover are visible during the LIA. While it is generally accepted that the ocean was not a main forcing factor in causing the LIA, there are some interesting questions, such as redistribution of heat and the amplification or reduction of the atmospheric temperature signal through the global ocean circulation. Also, during the LIA, the global upper ocean (top - 300m) was roughly 0.7C colder than today. This may have different implications on the structure of the interior ocean.
PUBLICATIONS
(peer-reviewed, in press and
submitted)
Sedláček, J.
and L. A. Mysak. A model study of the Little Ice Age and beyond:
Changes in ocean heat content, hydrography and circulation since 1500.
Climate Dynamics, submitted Mar. 2008.
Lemieux, J.-F.; B. Tremblay, S. Thomas, J. Sedláček
and L. A. Mysak 2008. Using the preconditioned Generalized Mimimum RESidual
(GMRES) method to solve the sea-ice momentum equation. Journal of
Geophysical Research, accepted.
Sedláček, J.
and L. A. Mysak 2008. Sensitivity of sea ice to wind stress and radiative
forcing since 1500: A model study of the Little Ice Age and beyond.
Climate Dynamics, doi:10.1007/s00382-008-0406-6.
Sedláček, J.;
J.-F. Lemieux, L. A. Mysak, L.-B. Tremblay and D. M. Holland 2007. The
granular sea-ice model in spherical coordinates and its application to
a global climate model. Journal of Climate, 20(24), 5946-5961, doi:10.1175/2007JCLI1664.1.
Mysak, L.A.; K.M. Wright, J. Sedláček and M. Eby 2005. Simulation of Sea Ice and Ocean Variability in the Arctic
During 1955-2002 with an Intermediate Complexity Model.
Atmosphere-Ocean, 43 (1), 101-118.
EDUCATION
Jan. 2003-Sept. 2008: Ph.D. student
at the Department of Atmospheric and Oceanic Sciences, McGill
University, Montreal, QC, Canada
Nov. 2001: Dipl. Natw. ETH,
Subject Climatology and Hydrology
Main Subject: Climatology
Minor Subject: Hydrology
Minor Subject: Geomagnetism and Geodynamics
Minor Subject: Geochemistry and Isotope Geology
Diploma Thesis (equivalent: Master's Thesis): "An Albedo
Parameterization for Sea Ice Models"
1996-2001: Student in the
Department of Earth Sciences at ETH, Zurich, Switzerland
1994-1996: Student in the
Department of Computer Sciences at ETH, Zurich, Switzerland.
WORK EXPERIENCE
Feb. 2002 - Dec. 2002: Credit Suisse Financial Services, Zurich, Switzerland:
Project Office Assistant
Oct. 2000 - Jan. 2001: Cablecom, Zurich, Switzerland:
Lead Project Assistant
Aug. 2000: Institute of Geomagnetism ETH, Zurich, Switzerland:
Rock sampling within the context of an international research program (CH, I, USA) in the Dolomites, Italy
Jun. 1997 - Jun. 2001: Institute of Geomagnetism, ETH, Zurich, Switzerland:
Student Assistant at the rock-laboratory
Sep. 1999: Institute of Climatology ETH, Zurich, Switzerland:
Radiosounding within the context of the Mesoscale Alpine Programme in the Tessin (South of Switzerland)
Apr. 1999: Norsk Polarinstitutt, Tromso, Norway:
Technical installation of a climate station on Spitzbergen, Norway
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