UNCLASSIFIED 



Security Classification 



(Security classifi* 



DOCUMENT CONTROL DATA -R&D 



of lille, body of abstract and /nde.\;/ij> annotation must be entered when tite 



all report is classified) 



I. ORIGINATING ACTIVITY (Corporate author) 



U.S. NAVAL OCEANOGRAPHIC OFFICE 



2a. REPORT SECURITY C L A SSI F I C A T10^ 



UNCLASSIFIED 



3- REPORT TITLE 



SOME SUMMER OCEANOGRAPHIC FEATURES OF THE LAPTEV AND EAST SIBERIAN SEAS 



4. DESCRIPTIVE NOT E.5 (Type of report and inclusive dates) 



Technical Report August-September 1963 and July- September 1964 



5. AUTHOR(S) (First name, middle initial, last name) 



Robert C . Locke rman 



REPOR T D A TE 



January 1968 



7a. TOTAL NO. OF PAGES 



50 



76. NO. OF REFS 



26 



8a. CONTRACT OR GRANT NC 



6. PROJECT NO. 202 02 



9a. ORIGINATOR'S REPORT NUMBER(S) 



TR-200 



10. DISTRIBUTION STATEMENT 



U .S. Government agencies may obtain copies of this report directly from DDC . Other qualified 

 DDC users mail request through: Commander, U.S. Naval Oceanographic Office, 

 Washington. D.C. 20390 ATTN: Code 40 



-^ In August-September 1963, a high degree of stratification for both temperature and 

 'salinity was observed in the Laptev and East Siberian Seas. Temperatures decreased with depth and 

 with distance away from the Siberian coast, and salinities decreased vertically from the bottom and 

 toward the coast . 



The five large rivers emptying into the Laptev Sea influence the temperature=salinity 

 characteristics to a great extent causing high temperatures and low salinities near the coast and in 

 the upper layers seaward. The Lena River fluvial plume, on the basis of salinity distribution, was 

 observed to extend in a north to northeasterly direction from the river delta. Tne combined effects 

 of the Khatanga and Anabar River runoff extended in a northeasterly direction from the Khatanga 

 River Estuary with vertical distribution of the low salinity water limited to the upper 10 meters. 



Water of three temperature-salinity relationships was observed in the East Siberian Sea in 

 both 1963 and 1964. Near the coast, between the Indigirka River and Chaunskaya Bay, warm low 

 salinity water was observed . In the sea's shallower western regions, cold water with slightly higher 

 salinities was noted • Both of these water types can be attributed to river runoff with cooling and 

 mixing in transit accounting for the colder water and higher salinities. Water in the eastern East 

 Siberian Sea through Long Strait and into the Chukchi Sea was observed to have water as cold as 

 -1 .S^C and as warm as 1 .4''C associated with salinities from 28 to 33%o. 



Lower dissolved oxygen values were present in Lena River effluent than in water in the 

 northern and western Laptev Sea. In the East Siberian Sea, dissolved oxygen values generally 

 increased seaward and toward the sea's eastern regions. 



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/N 10 1-807-680 1 



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