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Objective ● To understand the sensitivity and uncertainty of light absorbing aerosols deposition and the snow- melting process in current Earth system models Impurities in Snow and its Radiative Forcing over the Arctic and Northern China Qian Y, H Wang, R Zhang, M Flanner, and PJ Rasch. 2014. “A Sensitivity Study on Modeling the Black Carbon in Snow and its Radiative Forcing over the Arctic and Northern China.” Environmental Research Letters 9(6):064001. DOI:10.1088/1748- 9326/9/6/064001 Sensitivities of black carbon in snow concentration (top) and radiative forcing (bottom) to uncertain parameters. Impact ● Improvements in atmospheric BC transport and deposition significantly reduce the biases (by a factor of two) in the estimation of BC concentration over both Northern China and the Arctic ● Melt-water scavenging efficiency parameter found to play important role in regulating BC concentrations and radiative forcing. Approach ●Evaluate simulated black carbon (BC) in snow against measurements from multiple field campaigns over the Arctic and Northern China ●Conduct sensitivity experiments in CAM5 to examine the impacts of snow-aging and melt-water scavenging (MSE) efficiency on snow-melting and radiative forcing of BC ●Compare BC deposition uncertainty with that related to the treatment
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