western portions of the sea, from north of the Kolyma River westward, 

 temperatures from -0.5° to -1.4°C were noted with salinities from 

 10 to 28 %o . From Chaunskaya Bay eastward through Long Strait and 

 into the Chukchi Sea, temperatures from 1.4' to -l.S'C were observed 

 associated with salinities greater than 28 %n. 



For descriptive convenience the two water types, water with salinities 

 less than 28 %„ and temperatures generally below -0.5*C and water 

 having salinities less than 20 %o and temperatures generally above 

 O'C, will be termed "Siberian Coastal Water". Water observed in 

 the eastern East Siberian Sea with salinities greater than 28 iy„„ and 

 temperatures from 1.4° to -1.7"*C will be termed "Arctic Basin Surface 

 Water" although some of it may originate in the Bering Sea. 



a. Siberian Coastal Water . Water described here as "Siberian 

 Coastal Water" is characterized by salinities less than 20<^no . Although 

 two temperature-salinity relationships were observed in this water, 

 both most likely can be attributed to river runoff from the Siberian 

 mainland . 



Water In the eastern East Siberian Sea, in the area covered 

 by the NORTHWIND survey, was observed to have salinities less than 

 28 %o associated with temperatures below -O.S'C. These temperatures 

 and salinities were similar to those observed in Sannikova Strait 

 and the eastern Laptev Sea near the New Siberian Islands. Temperatures 

 observed on the single line of six stations occupied in Sannikova 

 Strait ranged from -0.90° to -1.25°C at the surface and from -1.20° 

 to -1.32°C near the bottom. Salinities observed on the same stations 

 ranged from 21.07 to 24.01 %„ at the surface and from 24.82 to 26.02 %„ 

 near the bottom. 



These low salinities were comparable to those observed in 

 water directly attributable to river drainage, such as that in the 

 southern and eastern Laptev Sea, but the temperatures were somewhat 

 colder. This is not unreasonable since cooling in transit due to 

 mixing and the presence of sea ice is to be expected in this area. 



Water near the coast between the Indiglrka River and Chaunskaya 

 Bay was observed to have salinities less than 20 %„ and temperatures 

 generally above 0°C. These temperatures and salinities can be directly 

 attributed to the addition of river water to this region by the Indiglrka 

 and Kolyma Rivers. 



Ocean station coverage did not serve to describe the fluvial 

 plume from either the Kolyma or Indiglrka River. Eastward from the 

 mouth of the Indiglrka River some indication of runoff effects was 

 observed at 5 and 10 meters in offshore Isotherm displacement. A 

 similar, though lesser, offshore displacement also was observed in 

 the 5-and 10-meter isohalines shown in figures 19 and 20. 



31 



