Conferencia: «New techniques to retrieve optical constans from single levitated particles»

Conferencia impartida por el Dr. Antonio Valenzuela, en el marco de la Unidad de Excelencia del Sistema Tierra de la UGR.

Abstract: Aerosols constitute one of the main climate change agents. According to the Fifth Assessment Report (AR5) of the last Intergovernmental Panel on Climate Change (IPCC) in 2013, atmospheric aerosol produces a net cooling effect of the Earth’s climate. However, an accurate estimate of this cooling is extremely difficult because of the large uncertainty on the estimation of the aerosol radiative forcing (RF), where the largest uncertainty in RF is due to uncertainties in understanding aerosol properties. Reduction of these uncertainties requires improved methods of laboratory determination of the optical properties of aerosol particles and their change with ambient relative humidity. Cavity ring-down spectroscopy (CRDS) has been proven to be a sensitive tool for measuring the absolute extinction cross-sections for single aerosol particles with high precision by combining optical confinement and levitation of a particle with CRDS. We present a new experimental approach which levitates single particles, confined within optical or electrodynamic traps, providing precise measurements of aerosol refractive indices, hygroscopic growth and other properties of importance for their atmospheric behavior.

• Fecha: Viernes 14 de junio de 2019
• Lugar: Salón de Conferencias del IISTA
• Horario: 13:00 h
• Organiza: Unidad de Excelencia del Sistema Tierra, GFAT, IISTA, UGR
• Más información:
  Juan Antonio Bravo Aranda, PhD
  Marie Curie Cofund Researcher – Athenea3i programme
  Atmospheric-Physic Research Group (GFAT)
  Andalusian Institute for Earth System Research
  University of Granada
  Avd. Mediterráneo s/n
  E-18007 Granada, SPAIN
  Phone +34 958 249745
  e-mail: jabravo@ugr.es