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Title: Experiments on Greenland whiteout modification, 1960
Authors: United States. Office of Ordnance Research
Calspan Corporation
Jiusto, James E.
Rodgers, R. R.
Keywords: Snow
Weather modification
Cloud seeding
Dry ice
Nucleating agents
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 84.
Description: Technical Report
Summary: A 2-month experimental program was conducted in Greenland to determine the extent to which arctic whiteouts and low clouds could be modified using cloud dissipation techniques. Seven seeding agents, applicable to supercooled or warmer-than-freezing clouds, were tried employing aircraft, tethered blimp-balloon, and rocket delivery. Successful dissipation of supercooled clouds was achieved with dry ice. As little as 5 lb of dry ice per mile, dispersed from aircraft, produced efficient clearing action and line openings up to 2. 5 miles wide. An inexpensive seeding scheme, involving a tethered blimp-balloon and open baskets of dry ice attached at intervals along the tether line, was shown to be capable of opening holes in low cloud overcasts. Such a technique appears feasible for maintaining safe landing corridors at ice-cap air strips during fog and low stratus conditions. Seeding materials that were ineffective in dissipating the supercooled clouds or warmer-than-freezing clouds encountered were liquid carbon dioxide, Greenland soil particles, silver iodide, carbon black, calcium chloride, and sodium chloride. Cloud hydrometeor and atmospheric nuclei measurements were made in relation to the modification tests. Specialized seeding equipment for specific arctic operations are recommended.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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