| OCR Text |
Show that riming substanti ally increases the fall velocity of a single crystal. Values for aggregati on are also given in Table A2. Riming serves to enhance the probabili ty of aggregati on by increasin g the differenti al fall velocities . However, significan t aggregati on is only observed at temperat ures near -4°C. The diffusiona l growth equation can be put into paramete rized form as follows: dm dt = 2 x 10 2 Y (T) m O. 5 m = 15. 2 x 10 V. 1 -4 r ( 19) 2 = k r 0 · 3 = 600mO. (20) 15 (21) I (22) Q. =__.nm 1 For diffusiona l growth a monodisp erse distributi on is assumed. 2 x 10 2 N(T) O. 5 Y(T) Q. O. 5 (23) 1 Total ice crystal water also includes the water collected by ice crystals through capture of small supercoo led water droplets. Thus, it is necessary to compile the ice crystal collection . Again, the particle distributi on is assumed to be Marshall -Palmer, but for ice the A relation is: A 2. 56/D = (24) 0 Defining Q., as 1 CX) CX) Q. 1 = (_' j 0 n .e -AD dD = r~ 01 Q. 1 = 4 X 10 -4 4 x 10 -4 D 2 n .e 01 -AD dD (2 5) (26) n . 01 n . 01 and Q. 1 347 ( 2 7) |
