STA.no, 22 20 18 16 14 13 12 II 10 9 8 7 



34.40 34.40 3450 3450 34.70 35.10 34.90 34.90 35.00 35.10 3 5.20 



100 — 



34J0 



200 



<0 

 IT 



300 



400 



600- 



- 100 



200 



■ 300 



•400 



- 500 



Figure 4. —Salinity profile to 600 m. based on data from hydrocast stations 7-22, TO-60-1. Contour interval: 0. 



Note the oxygen minimum layer, as in figure 3. 



- 600 

 10?». 



Figure 5 shows temperature- salinity (T-S) 

 curves from several stations off western 

 Lower California, from cruise 6004-B. Those 

 from line 120 are of stations off Point San 

 Eugenio (27° 50' N., 115° 10' W.); those from 

 line 143 (fig. 1) are of stations further south 

 off Magdalena Bay. These curves are typical 

 of California Current water in that area. The 

 curve of station 143.60 probably shows the in- 

 fluence of warm, saline eastern tropical, or, 

 possibly, central Pacific water at the surface. 

 Figure 6 shows curves from stations on line 

 153, still further south, and from cruise TO- 

 60-1. These two figures illustrate the fact that 

 with decreasing northern latitude the salinity 

 minimum (a marker of California Current 

 water) and the salinity maximum below it (a 

 marker of eastern tropical Pacific water ) have 

 an increasing value, but that the general form 



of the curve is maintained; that is, the changes 

 are quantitative rather than qualitative. 



T-S curves from stations still further south 

 fall into two main families or are quite 

 anomalous by virtue of deriving from more than 

 one kind of water. Figure 7 shows curves of 

 stations from TO-60-1 that probably represent 

 equatorial Pacific water (especially stations 

 54 and 56). Figure 8 shows curves of TO-60-1 

 stations in the Gulf of California that typify 

 Gulf water (except that the curve for station 

 10 suggests admixture of less saline water at 

 the surface) at this time of year (spring). 



Generally, the California Current's south- 

 easterly flow is reduced in the autumn, and 

 warm, saltier, equatorial Pacific water (Reid 

 et al., 1958, call it "southern" water) moves 

 northwestwards, inshore, along the coast of 

 southern Lower California. This corresponds 



10 



