and small angle value of indicatrix x(y= 1°)- Given as fractions 

 in the right-hand column are volumetric contents V^ and V, in 

 (cmVin') of coarse and fine fractions and also the type of water 

 (Kopelevich, 1983). Here, in the surface 10-m layer of water, 

 there is intense development of diatomic particulates (ocean 

 water was brown). At this station (Station 24), the white disk 

 could be discerned at the depth as small as 3 m. The integral 

 characteristics of light scattering here were also high ( K > 90, 

 cos Y - 0.943 ); as for the coarse fraction, its relative content was 

 somewhat lower (84%). For the purpose of comparison. 

 Fig. 4 shows how chlorophyll a is distributed throughout that 

 quasi-latitudinal section (data from Robie et al., subchapter 

 5.1.2, this volume). Obviously, there is certain correlation 

 between the two presented structures. 



It is possible that conditions prevailing at the area of 

 Station 24 were more beneficial for particulates development 

 and that it was just those factors that caused a sharp rise of 

 productivity in originally bioactive Pacific waters. It is 

 noteworthy, however, that these waters give higher values of K 

 and cos y • This can be explained as follows: All light- 

 scattering indicatrices measured in northern waters (all in all 

 about 100 angular relationships had been obtained) were 

 analyzed statistically. The analysis showed the volumetric 



content of fine fraction increasing with the rise of productivity 

 at a higher rate than that of coarse fraction. In other words, the 

 relative content of the latter drops (which, by the way, was the 

 case at Station 24). Accordingly, the indicatrix becomes less 

 extended and its integral characteristics decrease. Since the 

 water at Station 24 belongs to a very definite type, we shall 

 consider the diatom particulates as having the following 

 characteristics: 



K = 80-120, 

 cos Y = 0.945-0.960, 

 X,„ = 50-70, 

 R„_,., = 0.1 7-0.22. 



(14) 



It is understood that the upper and lower boundaries are 

 reached when the volumetric content of coarse fraction equals 

 88-92% and 84-85%, respectively. 



Gulf of Anadyr Littoral Waters 



Unusual structure of particulates was observed at Stations 

 26 and 30 at depths of subsurface maximum (15-30 m). Here, 

 the volumetric content of fine fraction comprised more than 



Section 1 



(25) 



(24) 



(23) 



Station No. 

 (22) 



(21) 



Fig. 3. Section I. (Stations 2.'i-l9) Vertical strin.turc of transmiltance. 



140 



