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Latest Posts

AIM/MCRN Summer School: Week 6

August 2, 2020

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AIM/MCRN Summer School: Week 5

July 26, 2020

 [...]

Professor Christopher K.R.T. Jones — Recipient of the 2020 MPE Prize


Professor Chris Jones is the Bill Guthridge Distinguished Professor in Mathematics at the University of North Carolina at Chapel Hill and Director of the Mathematics and Climate Research Network (MCRN). The 2020 MPE Prize recognizes Professor Jones for his many significant contributions to climate science and the mathematics of planet Earth.

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Colloquium or Seminar

Ice-covered freshwater-lakes: natural laboratories for investigation of buoyancy flows

Ecology

Speaker: Dr. Georgiy Kirillin, Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin (IGB)

01/21/13

14:00, WIAS, Mohrenstr. 39, 10117 Berlin, Germany

Weierstrass Institute for Applied Analysis and Stochastics (WIAS)

Convection driven by gravitational instability is a widespread phenomenon in the geophysical fluid dynamics, dynamics of stars and planetary interiors. In contrast to the quasi-homogeneous small-scale turbulence, convection is distinguished by the cell-like coherent structure of the flow. Absence of wind shear and non-linear dependene of freshwater density on temperature in vicinity of 4°C are characteristic features of ice-covered lakes. Therefore, a variety of convective flows develop there, driven by solar radiation penetrating the ice, and by salt fluxes at the ice-water and the water-sediment interfaces. In our field studies on ice-covered lakes, we apply modern measurement techniques, like microstructure profiling and acoustic doppler velocimetry, which deliver direct estimations of the mixing characteristics, comparable with the output of the eddy-resolving LES and DNS models. Providing a rare example of ‘pure’ convection in the natural conditions, ice-covered lakes serve as natural laboratories for investigation of convective mixing and for testing of CFD models. Apart from general geophysical studies, a number of ecological applications exist, where field studies on convection can be effectively combined with advanced mathematical modelling of convective mixing.

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