. Fig. 28. Changes in wind and in the distribution of surface isotherms off Antofagasta in the period June 8-10, 1931. The sequence of events described in the text may be traced by following the track of the ship (thin line in direction of thin arrows) from Punta Tetas. The position of stations on this line is shown by dots (cf. Fig. 9). Isotherms are indicated by heavy lines, wind direction and force by broad arrows. The dotted lines show the shift of the isotherms of 15, 16 and 17° C.; the isotherm of 14° C. had disappeared when the site occupied by it on June 8 was revisited on June 10 (see
. Fig. 28. Changes in wind and in the distribution of surface isotherms off Antofagasta in the period June 8-10, 1931. The sequence of events described in the text may be traced by following the track of the ship (thin line in direction of thin arrows) from Punta Tetas. The position of stations on this line is shown by dots (cf. Fig. 9). Isotherms are indicated by heavy lines, wind direction and force by broad arrows. The dotted lines show the shift of the isotherms of 15, 16 and 17° C.; the isotherm of 14° C. had disappeared when the site occupied by it on June 8 was revisited on June 10 (see Table III, and compare with Figs. 24-27). Comparison of Figs. 26 and 27 shows far more active upwelling and far more cold water at the surface in section 26 of the outward journey than in 27 on the return. The wind data show a similar contrast of strong southerly and easterly winds on the west- ward journey and weak northerly winds during the return (Fig. 28). While the subse- quent rise in surface temperature with change of wind might have been brought about by mixture of the upwelled with off'shore water, the evidence of the ship's drift raises another possibility. We may picture the lighter warm surface water driven away from the coast as a result of these strong southerly and easterly winds acting in conjunction
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