Accession Number : AD0888068

Title :   Project Gulf Q a Study of Maritime Cumulus Modification.

Descriptive Note : Summary rept. 4 May-3 Jun 70 on Phase 2,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Hall, Dale C. ; Clark, R. S. ; Wright, T. L. ; Cronin, H. E. ; Evert, R. W.

Report Date : AUG 1971

Pagination or Media Count : 75

Abstract : Phase 2 of Project Gulf Q was conducted 4 May through 3 June 1970 at Brownsville, Tex. The objective was to continue the study of the responses of warm cumulus clouds to seeding with ammonium nitrate, urea, and water, which was begun in Phase 1 of the project in May 1969. Thirty-two test cases were studied; 27 were seeded with ammonium nitrate, urea, and water; four were seeded with water alone; and one was unseeded. Statistical evidence was found to indicate that seeding warm cumulus clouds in the early or middle stages of their life cycles with ammonium nitrate, urea, and water causes increase in in-cloud updrafts and downdrafts, cloud water content, and cloud-height growth rates. Evidence was also found of a positive correlation between the amount of ammonium nitrate, urea, and water introduced into the cloud and the increase in liquid water content in the cloud. No correlation was found between seeding level and cloud response. No effect of seeding with water alone could be identified. (Author)

Descriptors :   (*ARTIFICIAL PRECIPITATION, TEXAS), CUMULUS CLOUDS, AMMONIUM COMPOUNDS, NITRATES, UREA, CONVECTION(ATMOSPHERIC), SAMPLING, STATISTICAL DATA.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE