Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: Giorgio Fiocco x
  • Refine by Access: All Content x
Clear All Modify Search
Giorgio Fiocco, Gerald Grams, and Alberto Mugnai

Abstract

A previous analysis (Fiocco et al., 1975) of the energetic equilibrium of small particles in the earth's upper atmosphere is extended to the 0–60 km region. The analysis is based on establishing a balance among the energy absorbed from solar and planetary radiation fields, the energy radiated by the particles, and the sensible heat exchanged through collisions with the ambient gas. The planetary radiation field is calculated as a function of altitude and includes radiation from the surface as well as emission and absorption by the infrared bands of CO2, O3, and H2O The various energy term change as a function of radius and altitude of the particles, season, time of day and the earth's albedo. Thus aerosols may beat or cool the atmosphere and their temperature may. differ from the ambient gas temperature. Maximum and average values for the heating rates induced by the particles into the ambient gas are computed for summer and winter 45°N conditions.

Full access
Giorgio Fiocco, Paolo G. Calisse, Marco Cacciani, Stefano Casadio, Giandomenico Pace, and Daniele Fua

Abstract

The acronym ABLE (Airborne Lidar Experiment) identifies a project to develop and fly an optical radar on a stratospheric platform for studies related to atmospheric radiation and composition. The prototype, ABLE 1, has been successfully flown on board the M55 Geophysica aircraft in the Arctic campaign of December 1996–January 1997 to observe stratospheric clouds and aerosol. The lidar, which runs automatically, has been installed in the unpressurized bay of the aircraft where the temperature approaches the low values of external air. The lidar transmitter is based on a Nd:YAG laser, with second and third harmonic outputs. The receiver consists of a 0.3-m Cassegrain telescope and several detection channels to look at different wavelengths and polarizations. A fluid circulation unit connected to the aircraft provides heating control. The instrument can point to the zenith or to the nadir. In the past campaign only λ = 532 nm was utilized: observations were carried out at two polarizations, pointing to the zenith. The present status of the device and foreseeable developments are described.

Full access