Meteorological observations obtained daily on the pier include 

 wind speed and direction, vet and dry biilb air temperature, cloud 

 cover and type, visibility, sea state, and state of weather. In 

 addition, pertinent data were extracted from the weather log main- 

 tained at Thule Air Base for analysis (Appendix V). Data on tidal 

 currents were obtained by suspending 3 Roberts radio current meters 

 at depths of 6, 26, and 5^ feet from an anchored radio buoy. Water 

 depth at each location was 12 fathoms. Signals transmitted from 

 the buoy were recorded at 30-minute intervals by a monitoring sta- 

 tion aboard the WESTWIM). Current meter Station 10 was occupied from 

 I83OZ, 25 September to 2100Z, 26 September; Station 11 was occupied 

 from 1200Z, 6 October to 1930Z, 13 October 1959. Current data were 

 not tabiolated, because the recorded results either approximated the 

 threshold value of the current meter (0.2 knot) or were unreadable. 



A supplementary survey conducted during April I960 by ^ydro- 

 graphic Office ice observers yielded late-winter temperature data 

 at Stations 1 and 2 (Appendix III). 



DATA ANALYSIS 



Oceanographic conditions at each station were examined for 

 factors contributing to the formation and growth of ice. Surface 

 temperatures indicating heat loss at the sea surface and physical 

 properties showing the distribution of heat loss throughout the 

 water column were studied. Data obtained outside the polynya 

 were compared to those obtained at Station 1 in order to deter- 

 mine the effect of the bubbling system on the oceanographic struc- 

 ture. 



Reversal of the heat budget had occurred prior to inception 

 of the oceanographic siirvey. Except for interruption by the foehn 

 on 8 October, progressive cooling was observed at all depths. The 

 temperat\ire rise shown by the tabulated data for ^, 10, and 11 Octo- 

 ber was observed at Station 1, Upon resumption of the cooling pro- 

 cess, surface temperature outside the bubbled area decreased rapidly. 

 The freezing point was attained on 13 October. 



A study of the salinity structure indicates spatial and tempo- 

 ral fluctuations of surface values and depth of the isohaline layer. 

 A plot of the surface salinity values at Station 1 is presented in 

 Figure k. The portion of the plot constructed from values for early 

 September indicates that a certain periodicity may exist. The pro- 

 nounced increase during the latter part of September is attributed 

 to cessation of runoff. 



Data obtained at Station 3 on I8 September and 12 October are 

 plotted in Figures 5 and 6. The surface water temperature on 18 

 September was 0.64° C; temperature maximum of 0.72° C occurred at 

 9 and 20 meters. The surface salinity was 31^23 °/oo. Convection 

 extended to a depth of only a few meters. 



