FI.IKRI. ANinVROBI.KVVSKI: WARM ('(^KK CUl.F STKKAM KINCS 

 Q DIFFUSION 



r20 



3 monlht 



DOWNSTREAM 

 DISTANCE X 



DIFFUSION 

 AND RING INTERACTION 



500 Km 



r\ 



• I 

 I 



I 



X (KM) 



500 



BIOLOGICAL DECAY AND 

 DIFFUSION 



X (KM) 



RING. BIOLOGICAL DECAY AND 

 DIFFUSION 



500 



500 



'--20 



Figure 8. - Time-dependent solution of the numerical model which includes a) the diffusion of a spawning group or cohort of larvae 

 as the patch is advected down the shelf. Snapshots are at 15-d intervals. Parameters u = 0, U,) = 5 cm/s, Ax = 5 km, and At = 0.5 

 d. b) Same as (a) except M = lO'^s"'. c) Same as (a) except a stationary ring is present at the shelf edge, with parameters A = 20 



— 1 — 1 



cm/s and L = 20 km. d) Same as (c) except jj = 10 s . 



As the ring passes by, the patch of larvae is spread 

 out and distorted. Some losses do occur, but because 

 of the rapidity of the interaction, these are slight. 

 Comparison of this picture with Figure 8d shows 



that the larval density at 4 mo is higher than that for 

 the stationary ring case. On the other hand, in the 

 case when the shelf flow is faster than the speed of 

 the ring (Fig. 9b), the impact of the ring is tremen- 



323 



