Quantitative Diffusion Estimates of Cloud Seeding Nuclei Released from Airborne Generators


  • Abraham Gagi Department of Atmospheric Sciences
  • Marcel Aroyo Department of Atmospheric Sciences, Hebrew University of Jerusalem, Israel


Quantitative diffusion estimates of cloud seeding materials released from airborne generators are presented for a varietyof meteorological and delivery modes. These studies focus primarily on the case of broadcast seeding of an area downwind from a line of seeding along which the seeding air craft fly in a patrol mode.

The computational technique assumes that the release by aircraft of the seeding material can be the integrated contributions segments of the line of seeding, of equal length, each of which is considered to act as instantaneous dimensionsof the target area of Israeli II. The results suggest that:

i) Under the given conditions of aircraft performance, nuclei output of the airborne generators and meteorological conditions, the dispersed concentrations of the seeding material within the target area are, in principle, within the limits required for "static" seeding for microphysical effects.

ii) Regions of maximal exposure times to optimal concentration of cloud seeding nuclei are found downwind at distances of 20 to 50 km from the line of seeding

iii) Increased area coverage of seeding can be obtained primarily by increasing the numbers of seeding aircraft rather than by increasing the nuclei output of the airborne generators.






Scientific Papers