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<br />,. <br /> <br />2 <br /> <br />Very recently workers at the Illinois State Water survey have shown <br /> <br />\ <br /> <br />that ~ersistent contrails laB out in the heavily travelle.j air corridors <br /> <br />over the state rlecrease the total flux of ra:,iation to the surface beneath <br /> <br />these corrirlors. <br /> <br />In each case the ballrark lecrease is of the order of 10~. If it <br /> <br />., <br /> <br />."'" <br /> <br />is rossible to rrorluce such effects artificially, then ~erhans a more <br /> <br />structureJ a"~roach to the nrorluction of these clou:\s can leal to beneficial <br /> <br />weather mOlification. For instance, recent calculations cone at Colora'o State <br /> <br />University show that a 'lecrease in the maximum tem"erature on the hottest <br /> <br />rlays of the growing season by a few rlegrees may have the same effect on <br /> <br /> <br />cror ~roiuction as a 10% increase in annual rainfall. in the iry farming <br /> <br />regions of the high "lains. It may be rossible to mo'Hfy the severity or <br /> <br />the location of severe convective storms. Or nerhans an artificial clou" <br /> <br />deck lai-i out over the citrus groves of Florida on an otherwise clear winter <br /> <br />night will stem the rlunge of the mercury that woulrl occur if the surface of the <br /> <br />earth were allowed to radiate through clear skies. <br /> <br />Jet aircraft are e~ensive to o~erate. The i~virlual contrails generally <br /> <br />have a limitei. growth an', affect a small area. Due to the water injecte1 by <br /> <br />fuel combustion, the in:livi,!ual i?e ~:ystals_l':row rather ranUly an:l "fall out" <br /> <br /> <br />within 30 to 60 minutes or so, in most cases. <br /> <br />Our single engine rroreller-lriven Schweizer can reach 35,000 feet. With <br /> <br />it we. hone to test the ability of artificial ice nuclei to nucleate ice directly <br />