Figure 8. — Occanographic sampling accomplished during F 

 DRAKE 75. 



changes with time, the Yelcho again mapped the thermal struc- 

 ture of the region during the last 2 weeks of the Thompson 

 survey. In this manner, investigators were able to obtain a 

 reasonably good picture of the temporal development of meso- 

 scale frontal features. 



The Professor Vize deployed three current meter moor- 

 ings in mid-January 1976. These moorings were maintained 

 for about 1 month during an extensive hydrographic survey 

 (fig. 10) that included upper air observations every 6 hours 

 to study the meteorology of the region. 



Other Studies 



ISOS sponsors individual theoretical studies and regular 

 meetings of a panel on theoretical studies. The studies emphasize 

 circumpolar current dynamics. Included are laboratory investi- 

 gations, an analytical study of topographically-induced jets in 

 a zonal channel, and analytical studies of the interaction of 

 bottom topography and the circumpolar current. Another ISOS 

 project provides for the publication of a Southern Ocean Atlas. 

 Completion of the Atlas is expected in 1978. Some preliminary 

 plates based on data collected by the Islas Orcadas have been 

 published. In September 1974, an ISOS field project was com- 

 pleted near McMurdo Sound to detcrmnie the feasibility of 

 winter hydrography in the regions of bottom-water formation. 

 Although this project yielded promising results, logistic con- 

 straints prevented further measurements. 



ISOS Bibliography 



Baker, D. J., Jr. 1975: Ocean monitoring as an element in 

 climate prediction, in Energy and Climate: Outer Limits 

 to Growth? Report of the Geophysics Research Board of 

 the National Academy of Sciences. 



Baker, D. J., Jr. 1975: U.S. contribution to Southern Ocean 

 dynamics, Rev. Geophys. & Space Phys., 13(3) :61 5-617. 



Baker, D. J., Jr. 1975: Currents, fronts, and bottom water, 

 Oceanus, 18(4):3-15. 



Gordon, Arnold L. 1975: Contributions of RV Conrad to 

 F DRAKE, 1975. Antarctic J. of the U.S. 14(2): 142- 

 143. 



Figure 9. — Location of year-round measurements in Drake 

 Passage during 1976. Triangles are current meter moorings. 

 Each mooring had an Aanderaa current meter at 2,700 m; 

 D, R, A, and E had another Aanderaa current meter at 500 

 m. Circles TG5 and TG6 are locations of shallow-water 

 Aanderaa tide gauges. Squares PI, P2, and P3 are locations of 

 deep-sea pressure gauges. P2 and P3 were at 500-m 

 depth and PI at 1,700-m depth. 



54° 



56" 



58^ 



60" 



62" 



64° 



66° 



68° 



2759/1 



2808/50 



\ 



2792/34 



a 



A6CN-1 



2791/33 2771/13 



2809/5 



^ ^. 



m ^ ^ 



Y^ 2767/9 !• * " 



■.A6CN-4Sj 



80" 



75" 



70" 



65" 



60" 



Figure 10. — RV PROFESSOR VIZE oceanographic 

 observations in Drake Passage, January 1976. 



22 



