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The FACE confirmatory program (FACE-2): design and evaluation specifications, June 1, 1978
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1978
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[PDF-106.42 MB]
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Description:The design and prospective evaluation for the confirmatory phase of the Florida Area Cumulus Experiment, herein called FACE-2, are specified in this document. FACE is a continuing effort to determine the potential of dynamic seeding for increasing convective rainfall over a fixed target area. The initial, or exploratory, phase of FACE (FACE-1) provided evidence for increased rainfall. The focus of FACE-2 is confirmation of these indications. FACE-2 will be an intensive program to obtain a minimum of 35 randomized B (> 60 flares) days of experimentation. Every effort will be made to obtain the required sample during the summer of 1978. Under no circumstances will the number of B days exceed 60 in FACE-2. The sequence of treatment decisions will not be revealed until the end of the entire field effort and only after all rainfall data reduction is completed. The design for FACE-2 is similar to that of FACE 1976. The double-blind nature of the experiment has been strengthened, and fixed periods of experimentation, treatment, and observation have been specified. Treatment decisions will be determined through a blocked randomization scheme. The gageadjusted radar method of precipitation estimation will be employed and additional rain gages will be placed in the target area to enable us to make an independent assessment of target rainfalls. Constant Altitude Plan Position Indicator (CAPPI) radar observations of cloud top height will be made to examine the dynamic response of the clouds to seeding. Cloud physics and lightning programs are planned. The cloud physics effort will be particularly important in documenting further the physical processes operative before and after dynamic seeding. Overall and detailed confirmation of data subsets will be sought in FACE-2 according to specific criteria. Analyses begun in FACE-1 to gain more insight into natural and modified convective processes will be continued. This information is necessary to strengthen the FACE physical hypothesis and it is requisite for planning the testing of dynamic seeding in other geographical regions and/or under other weather regimes.
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Rights Information:CC0 Public Domain
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