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Physics Colloquium - Dr Kristofer Döös

Monday, 4 March 2019

Physics Department

Dr Kristofer Döös


Department of Meteorology

Stockholm University

"The Effects of Global Warming on the coupled Ocean-Atmosphere Hydrothermohaline Circulation"

Man-made emissions of greenhouse gases lead to an increase of surface air temperatures. This positive trend of air temperature will have an impact on the hydrological cycle as warmer air can hold more water vapour, which is known as the Clausius-Clapeyron relationship. This increase of water vapour in the atmosphere is associated with an increase of the the evaporation, which in turn increases the salinity in regions of evaporation. Here the Clausius-Clapeyron relationship is hence extended to not only to give a relationship between air temperature and moisture but also with the sea-surface salinity. This leads to a direct relationship between the moisture increase and the salinity increase. This ocean-atmosphere climate change is analysed here by superimposing the entire global atmospheric circulation in humidity-temperature (hydrothermal) coordinates on that of the global ocean in temperature-salinity (thermohaline) coordinates. This reveals a nearly perfect match according to our extended Clausius-Clapeyron relationship between temperature-humidity and salinity.

WHEN: Monday 4 March 2019
WHERE: Room 314, Science 3 Building
TIME: 3.00 pm–4.00 pm

All interested are welcome to attend

Light refreshments to follow in Common Room