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Black Carbon-Snow-Radiation Interactions and Albedo Effects over the Tibetan Plateau

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Wednesday, 22 February 2017, 12:00

Wednesday, February 22, 2017. 12:00 PM. Black Carbon-Snow-Radiation Interactions and Albedo Effects over the Tibetan Plateau. Cenlin He, UCLA. Sponsored by NOAA Geophysical Fluid Dynamics Laboratory. More information here.

Postdoc/visiting scientist lecture. Black carbon (BC), commonly known as soot, has been identified as the second most important anthropogenic emissions in terms of global climate forcing in the current atmosphere. Its regional warming effect can be even stronger over snow-covered areas due to BC-snow albedo effects. Observations have shown that BC deposition on snow is an important driver of rapid snow melting and glacier retreat over high mountains such as the Tibetan Plateau, which can further affect hydrological cycle and water availability. However, BC-snow-radiation interactions and associated albedo effects have not been thoroughly studied in such a manner as to understand, quantify, and reduce large uncertainties in the estimate of radiative and hydrological effects. Thus, this study seeks to improve our understanding and estimates of BC-snow albedo effect by developing a new snow model and BC-snow parameterizations for several important features in BC-snow-radiation-mountain interactions, including realistic snow grain shape, stochastic multiple aerosol-snow internal mixing, snow close packing, and 3-D radiative transfer over complex terrain, which have not been accounted for in previous studies. We particularly focus on the Tibetan Plateau regions. Additional efforts have also been given to investigate BC atmospheric aging, a key process representing hydrophobic-to-hydrophilic conversion, which affects BC optical properties and deposition on snow and hence BC-snow albedo effects. 

Location  Smagorinsky Seminar Room, NOAA GFDL, Princeton, NJ