Fig. 16. Zona! distribution of chlorophyll a average for a certain layer of water 

 (data from Robie el ai. Subchapter 5.1.2, tiiis volume). 



the result was negative. However, it was found that promising 

 results (Fig. 18) are obtained by comparing relevant values 

 only within the depths of localized subsurface turbid layer, 

 notable also for higher chlorophyll concentrations (Figs. 1 lb, 

 1 2b, 1 3b). The correlation of current values of e and Chi a can 

 be well expressed by the relation Chi a = 20E+7. 



Investigating Vertical Structure of Transmittance on Test 

 Areas and Sections 



East Polygon . Waters at the area of deeply immersed East 

 Polygon stations have a typical subpolar structure of 

 transmittance. The upper 20-30-m layer was turbid 

 (£ = 0.4-1.1 m '); below 50 m, very clear water 

 (£ = 0,13-0.1 m'). At shallow Stations 131 and 132, near the 

 bottom there appeared a thin turbid layer(8 = 0.2-0.25m '). At 

 Station 132, there was a reduced content of particulates in the 

 surfacelayer(e = 0.25m 'compared to £ = 0.6-0.7 m' at Station 

 131). 



South Polygon . Optical structures of transmittance at the 

 South Polygon are characterized as subpolar. In the upper 

 50- m layer, the attenuation index was £ = 0.25-0.3 m ' (at 

 Station 1 10, £ = 0.65-0.7 m '); lower depths (80 m) had clear 

 water (£ = 0. 1 1-0.095 m '). The attenuation index changed 

 gradually in the intermediate layer. Angular characteristics of 

 light scattering showed that the volumetric content of coarse 

 particulates per 10 m depth interval varied from 0.43 cmVm' 

 (Station 1 1 1 ) to 0.59 cmVm' (Station 1 10); fine particulates 

 varied from 0.05 cmVm' up to 0.09 cmVm' (at the same 

 stations). Assays of deep water from 200 to 2,450 m (Station 



chl a 

 25 



(mg/m ) 



• Anacjyr Gulf 



A Bering Sea {nonh area) 



+ East Polygon 



O Chuckcht Sea 



/= 



• St, 24 / 

 / 

 / 



/ 

 / 





chl a (mg/nf ) 



4 5 e (m 



Fig. 17. Relationship (Chl a) from (f) in experiment.s. 



Fig. 18. Dependence Chl ii from within the depths of localized subsurface 

 cloudy layer. 



150 



