Institute for Climate and Atmospheric Science (ICAS)

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Presentation transcript:

Institute for Climate and Atmospheric Science (ICAS) Mineral Dust Ice Nucleation Experiments Steven Dobbie, Jim McQuaid Gourihar Kulkarni (PhD 2007), Figure 1. The TGDC is housed in the Environmental Cold room at ICAS Aerosol Facility, ICAS Key points of new chamber design: Static diffusion chamber Observation of nucleation events of individual particles Flexibility to expose individual particles to a range of supersaturations. Stable temperature control Designed for process studies

Mineral Dust Ice Nucleation Experiments Institute for Climate and Atmospheric Science (ICAS) Mineral Dust Ice Nucleation Experiments Figure 2. SEM of Saharan mineral dust Gourihar Kulkarni (PhD, 2007) studied the onset nucleation super-saturation of Saharan mineral dust with temperature (Kulkarni et al., Submitted to AMT, 2008)

Current & Future Nucleation Experiments Institute for Climate and Atmospheric Science (ICAS) Current & Future Nucleation Experiments - Homogeneous nucleation of glassy particles. Theo Wilson, Chem PhD student with Ben Murray (Chem) and Steven Dobbie (ICAS). Memory effect of IN particles. NERC grant application (Dec 1, 2008), collaboration of Ben Murray (Chem) and Steven Dobbie (ICAS). Gas inlet Sub-sat stage Water vapour bath Ice nucleation chamber

Institute for Climate and Atmospheric Science (ICAS) Aerosol Modelling (Dobbie): Collaborative link with Canadian Climate Centre for Modelling and Analysis: - Parameterisation of sea-salt optical properties and associated growth for GCMs. Installed in the Canadian GCM model. J. Li, X. Ma, K. von Salzen, and S. Dobbie Parameterization of sea-salt optical properties and physics of the associated radiative forcing Atmos. Chem. Phys., 8, 4787-4798, 2008