Midtvejskollokvium - Heidi Villadsen – Niels Bohr Institute - University of Copenhagen

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Midtvejskollokvium - Heidi Villadsen

Climate change caused by black carbon deposits on snow and ice

Peter L. Langen

Black carbon (BC) is formed through incomplete combustion of fossil fuels, biofuels, and biomass, and has both natural and anthropogenic sources. BC particles act as a climate forcing agent in several different ways. In this thesis the possible impact on climate through deposition of BC on snow and ice will be investigated. Snow and ice make highly reflective surfaces, but the presence of BC decreases the albedo. A lower albedo results in greater absorption of solar radiation which affects climate in different ways. In this thesis a sensitivity study of changing the albedo of snow and ice is performed in order to improve the understanding of the climate forcing and response from BC in snow. The sensitivity study is performed using the model EC-Earth which is a relatively young Earth system model based on the weather prediction model developed at theEuropean Centre for Medium-range Weather Forecast (ECMWF).