Airborne field experiments

Elemental iodine is a reactive gas, and the rate of uptake on certain surfaces is controlled by the rate of diffusion through the boundary layer over the surface. At some surfaces, tracer quantities of iodine are adsorbed irreversibly, at others reversibly. In most applications the amount of iodine on the surface is much less than a monolayer, and the equilibration between the adsorbed and airborne iodine cannot be considered in terms of vapour pressure. In 1949, experiments were started at Harwell, both in the wind tunnel and in the field, to study the deposition of elemental 131I vapour to surfaces. 

An astronomical experiment is described which allows simultaneous viewing of the same field of view in well defined bands at 30, 50 and lOOym with AX/X V2 Color temperatures as well as surface brightnesses are measured directly the system has obvious advantages for airborne and balloon platforms where good absolute pointing accuracy and reproducibility are difficult This experiment has been flown successfully on the NASA 91 cm airborne telescope. 

Erom both airborne and ground-based field campaigns during the 2004 Amazon dry season as part of the Tropical Forest and Fire Emissions Experiment (TROFFEE), Yokelson et al. quantified the volatile emissions from a pristine tropical forest and several plantations [168]. In addition to this the emissions, fuel consumption and fire ecology of tropical deforestation fires were also quantified. About 80% of the mass of non-methane organic compounds emitted by the tropical deforestation fires were found to be associated with reactive, oxygenated VOCs. Recommended values for the emission factors for most of the major compounds released by deforestation fires globally were provided. 

The holographic method is a relatively new imaging technique developed about three decades ago. Since then, this method has been used in the study of airborne and liquid-borne particulate systems in their real world environments [21]. In a holographic experiment, images are formed in a two-step process. In the first step, a collimated coherent light is used to illuminate the sample. A hologram is formed by the far-field diffraction patterns of all the particles in the... 

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