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<br />OcrOBER 1988 <br /> <br />ARLIN B. SUPER AND BRUCE A. BOE <br /> <br />1169 <br /> <br />TABLE 1. Summary of seeded zone for 3.8 km passes with ground generator on 19 Mar 1986. <br /> <br /> Time of Seeded zone Total <br /> seeded zone edge positions* Seeded zone Seeded zone Maximum Mean Volume acoustical <br /> penetration (WSW from Snow Lab) center"' width IPC IPC sampled counter <br />Pass (MST) (km) (km) (km) (L-1) (L-1) (L) counts <br />I 1200 5.27-5.86 5.6 0.6 48 17 13.6 11 <br />2 1209 5.80-8.41 7.1 2.6 74 16 56.0 28 <br />3 1221 6.76-8.09 7.4 1.3 101 21 25.1 30 <br />4 1230 7.37 7.4 <0.1 94 82 0.4 22 <br />5 1240 6.11 6.1 <0.1 22 22 1.1 7 <br />6 1309 6.13-6.89 6.5 0.8 120 50 8.3 21 <br />7 1316 5,0 -9.0** 4 2 149.0 5 <br /> * WSW from Snow Lab. <br /> ** Approximate zone based on earlier passes (AgI generator off at 1248). <br /> <br />zone") were thus defined for each pass according to <br />where the IPC fell below 10 L -1 and remained below <br />that level for at least a few kilometers beyond. Seeded <br />zone information is summarized for each pass in Table <br />1. In general, the seeded zone was quite narrow at 3.8 <br />km altitude, exceeding 1.0 km on two passes but less <br />than 0.1 km on two others. A 0.5 km plume width <br />measured at the aircraft sampling line 6.3 km down- <br /> <br />wind of the Agl generator corresponds to only 4.50 of <br />arc. Mean seeded zone IPCs ranged from 16 to 50 L -1 , <br />except for the very narrow plume recorded on pass 4 <br />and the low postseeding concentration observed on pass <br />7. As will be shown, the natural mean IPC was near <br />3 L -1. <br />The high-resolution precipitation gage network re- <br />corded at most only intermittent trace amounts during <br /> <br />.25~ <br />~~ ' <br />~E : <br />(/)01 <br />.00 <br /> <br />~ <br /> <br />~ <br /> <br />~~ <br /> <br />~~ <br /> <br />.. <br />I <br /> <br />ENE <br /> <br />wsw <br /> <br />"LI <br /> <br />860319 <br />1307-1310 mst <br />PASS 6 <br /> <br />100 <br />z <br />o <br />~ <br />IE: <br />... <br />Z <br />IoU <br />o <br />Z <br />o <br />o <br />IoU <br />d 50 <br />i= <br />IE: <br />f <br />IoU <br />2 <br /> <br />o <br />o <br /> <br /> <br />5 10 <br />DISTANCE WSW FROM SNOW LAB IN KM <br /> <br />15 <br /> <br />FIG. 3. Buffer-by-buffer ice particle concentration and supercooled liquid water content recorded on 19 Mar <br />during the first ground-based seeding experiment. <br /> <br />ll;,'. <br />