Modeling Transport and Processing of Light Absorbing Aerosols Deposited on the Greenland Ice Sheet in 2013

摘要: The processes that result in aerosol deposition within the Arctic are important for understanding how mid-latitude pollution impacts and modifies natural environment. Aerosol is a dominant source of light-absorbing impurities, including black carbon, found ice snow. Trace amounts light absorbing impurities snow because they used to interpret past trends (e.g. fire frequency) using cores have climate (warming) due their modification albedo. Here, we focus on role biomass burning controlling amount carbon deposited Greenland sheet. Biomass known modify burden, but large uncertainties remain with respect specific impacts. In this presentation, case sheet studied by combining extensive pit measurements simulations regional model WRF-Chem. Light were measured pits (in 2014) accumulation rates (2013-2014) monitored at several remote sites as part SAGE project. largest quantity was traced event occurred early August 2013, which included having 2-4 cm water equivalent BC concentrations up 40ng/g . In order understand origin identify observed event, WRF-Chem (run from 17 July – 5 2013). simulation includes anthropogenic emissions North America well transport chemical/physical both trace gases aerosols. Model results show can be fires northern Canada late 2013. will discussed critical pathways storm systems, essential fate region.