David Andrew Barry | 大型湖泊深水变暖的水动力调控机制：来自日内瓦湖的启示

D. Andrew Barry is an Australian whose career path included academic appointments in Australia, the US, the UK, and Switzerland. He joined EPFL in 2005 and led the Ecological Engineering Laboratory in the Institute of Environmental Engineering until retirement in 2023. His professional contributions have been recognized by different awards, including Fellow of the American Geophysical Union, International Fellow of the Royal Society of Edinburgh, and Member of Academia Europaea.

Most thermal energy enters lakes through fluxes across the air-water interface. In deep lakes, surface buoyancy forcing establishes a stable vertical density stratification that suppresses turbulent and convective exchange between epilimnetic and deep waters, so hypolimnetic warming cannot be interpreted as a simple consequence of surface heating alone. Using Lake Geneva as a case study, this talk examines the hydrodynamic processes governing the redistribution of heat and deep-water renewal in large, deep temperate lakes. Daily to seasonal surface heating and cooling drive the formation of the upper mixed layer and convective renewal, while wind stress generates upwelling, downwelling, and basin-scale internal motions. In large basins, these motions are further shaped by bathymetric variations and rotational effects associated with the Coriolis force.

Most thermal energy enters lakes through fluxes across the air-water interface. In deep lakes, surface buoyancy forcing establishes a stable vertical density stratification that suppresses turbulent and convective exchange between epilimnetic and deep waters, so hypolimnetic warming cannot be interpreted as a simple consequence of surface heating alone. Using Lake Geneva as a case study, this talk examines the hydrodynamic processes governing the redistribution of heat and deep-water renewal in large, deep temperate lakes. Daily to seasonal surface heating and cooling drive the formation of the upper mixed layer and convective renewal, while wind stress generates upwelling, downwelling, and basin-scale internal motions. In large basins, these motions are further shaped by bathymetric variations and rotational effects associated with the Coriolis force.