interested in the project, and with those working in other 

 branches of oceanography and meteorology. As a result 

 of this meeting, two joint theoretical projects were in- 

 itiated: a numerical modeling of eddy statistics in the 

 POLYGON 70 region and observation comparisons; and 

 a study of non-linear Rossby wave dynamics. Abstracts 

 of all papers presented at the summer institute will be 

 collected and published as a joint Soviet-American report. 



2. CTD intercomparison aboard RV Akademik Ver- 

 NADSKY. Preliminary results of calibration and intercom- 

 parison of American and Soviet conductivity-temperature- 

 depth (CTD) observations obtained during leg 3 of RV 

 Akademik Vernadsky cruise 14 (October 16-29, 1976) 

 are given in table 7. The expected standard deviations for 

 each instrument were calculated from the quantizing inter- 

 nal; this was compared with the range of standard devia- 

 tions obtained from joint lowerings. The observed values, 

 which were preliminary estimates, were about two to three 

 times the digitizing noise level when the CTDs were 

 stopped at the bottom or top of the cast. The magnitude 

 increased by 10 to 50 times the digitizing noise level 

 when the CTDs passed through a sharp vertical gradient. 



These trials showed that significant improvement in com- 

 patibility of data could be achieved by intercalibration. Ob- 

 served differences were sufficiently great to question laboratory 

 calibration standards and techniques. A recommendation was 

 made to consider shipboard calibration facilities on Soviet 

 POLYMODE ships. 



3. R/V Akademik Vernadsky Current Meter Inter- 

 comparison. This intercomparison was carried out in Oc- 

 tober. 1976. The primary purpose of the intercomparison 

 was to compare velocity measurements at 4,000 m depth 

 using U.S.S.R. and U.S. current meters on U.S.S.R. sur- 

 face float moorings with measurements by U.S. current 

 meters on U.S. subsurface moorings at the same level (see 

 table 8.) The intercomparison was scheduled at an Array 



2 mooring (#581) to minimize effort and cost. The 

 United States prepared two 850 current meters to deploy 

 on two U.S.S.R. moorings. The moorings were set about 

 5 km apart. Only a partial record was obtained from the 

 850 current meter on one Soviet mooring, and the 850 

 current meter on the other Soviet mooring was partially 

 flooded on recovery and yielded no data. 



Figure 6. — Distribution of deep-current velocity statistics 

 along 55°W (time averages indicated by solid line) and 

 70 W (space-time averages indicated by dashed line). 

 Symbols ■ and • are for 4,000 m data, for 5,000 m, 

 and H for 2,000 m. The latitudes of the 70°W data have 

 been shifted 2° north. Top) East-west velocity compon- 

 ents; Middle) eddy kinetic energy; Bottom) ofi-diagonal 

 horizontal Reynolds stress. 



16 



