Abstract
During the past three decades, most experimental convective cloud seeding programs have relied exclusively on aircraft for delivery of ice nuclei to the clouds. However, some commercial operators have made extensive use of ground-based generators intending to accomplish the same objective.... During the past three decades, most experimental convective cloud seeding programs have relied exclusively on aircraft for delivery of ice nuclei to the clouds. However, some commercial operators have made extensive use of ground-based generators intending to accomplish the same objective..... The exploratory Agl tracing program discussed here in has shown that vertical diffusion, during summer afternoons in central Montana, was often sufficient to transport Agl into small cumulus clouds based 1.5 to 2.5 km above ground within a few to several kilometers of the ground-based generators.....
Highlights
Duringthe past threedecades,mostexperimentaclonvectivecloudseeding programshave reliedexclusivelyon aircraftfor deliveryof ice nucleito the clouds.,some commercialoperatorshave made extensiveuse of groundbasedgeneratorsintendingto accomplishthe same objective.Use of aircraft as a deliverysystemhas a definiteadvantagefrom an experimentaplointof view becausea controlledamountof seedingmaterialcan be introducedinto a specificcloud.This is not the case with ground-releasemdaterialand, considerablsekepticismexistsas to whetherground-releaseidce nucleiroutinely becomeentrainedin activelygrowingcumuluscloudsin sufficientquantitiesand at the correcttime to produoea positiveseedingeffect.Relativelyfew measurementprogramshave attemptedto documentthe transportand diffusionof groundreleasedsilveriodide(AgI)from non-mountainoutserrainduringsummer. surveyof pertinentliteraturecan be foundin Superand McPartland(1973)
The high cost of aircraftseedingoperationsis a disadvantagfeor operational seedingprograms.It is probablethat a considerablceost savingcouldbe achievedif groundgeneratorswere shownto be capableof supplyingcloudswith sufficient(but not excessive)ice nucleiat the righttime and location achievedesiredseedingeffects
Air temperatures obtained during the flight indicated that a dry-adiabatic lapse rate existed from near surface (1250 m - all elevations above sea level) to 3960 m, which was the highest level of measurement
Summary
Duringthe past threedecades,mostexperimentaclonvectivecloudseeding programshave reliedexclusivelyon aircraftfor deliveryof ice nucleito the clouds.,some commercialoperatorshave made extensiveuse of groundbasedgeneratorsintendingto accomplishthe same objective.Use of aircraft as a deliverysystemhas a definiteadvantagefrom an experimentaplointof view becausea controlledamountof seedingmaterialcan be introducedinto a specificcloud.This is not the case with ground-releasemdaterialand, considerablsekepticismexistsas to whetherground-releaseidce nucleiroutinely becomeentrainedin activelygrowingcumuluscloudsin sufficientquantitiesand at the correcttime to produoea positiveseedingeffect.Relativelyfew measurementprogramshave attemptedto documentthe transportand diffusionof groundreleasedsilveriodide(AgI)from non-mountainoutserrainduringsummer. surveyof pertinentliteraturecan be foundin Superand McPartland(1973). The purpose of the program was to investigate the persistence, as active ice nuclei, and diffusion (especially in the vertical), of the Agl-NH41-acetone seeding agent. No attempt was madeto achieve any given concentration of Agl at any particular location in the clouds that formed.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
