. Discovery reports. Discovery (Ship); Scientific expeditions. 148 DISCOVERY REPORTS STATION NUM6ER5_W5E36 MILES FROM COAST _ ' 50 WSG43 WS64I W5642 |W56C 18-12° S: SAN JUAN AND CALLAO The meteorological and hydrological conditions off San Juan and Callao present an interesting contrast with one another and with those off Arica (compare Figs. 4 and 16 and also 31-33). At Arica in calm wind-free conditions, surface isotherms were bunched close to the coast, yet upwelling and northerly current were strong inshore. Off San Juan a strong south-east wind blew and upwelling was such that the surface
. Discovery reports. Discovery (Ship); Scientific expeditions. 148 DISCOVERY REPORTS STATION NUM6ER5_W5E36 MILES FROM COAST _ ' 50 WSG43 WS64I W5642 |W56C 18-12° S: SAN JUAN AND CALLAO The meteorological and hydrological conditions off San Juan and Callao present an interesting contrast with one another and with those off Arica (compare Figs. 4 and 16 and also 31-33). At Arica in calm wind-free conditions, surface isotherms were bunched close to the coast, yet upwelling and northerly current were strong inshore. Off San Juan a strong south-east wind blew and upwelling was such that the surface isotherms spread out from the coast. Off Callao the wind lay towards the shore, with a slackening of upwelling and with the surface isotherms again bunched close to the shore.^ Off San Juan the volume of cool water was greater than at any region hitherto examined. Upwelling phenomena were evidently at their height, and the temperature rose from 13-79 to I9'25° C. at 95 miles offshore. Beyond this the ship crossed a patch of water, warmer than the sea on either side, and which appeared to differ from the surrounding water in its movement (see p. 129). It was some 50 miles wide and had a maximum temperature of about i9'48^ C. A warm wedge of very similar water was met later off Callao where it was also about the same width but closer to the coast; here its direction of movement was not noted. Northwards of Callao the wedge was traced to the Guanape Islands and possibly beyond, and later in the season it was again identified off Callao (see p. 171). Its appearance in section is seen in Figs. 32, 33 and 52. The absence of current at Callao, the on- shore wind and the closing of surface iso- therms with the coast, indicate that the temperature section illustrated in Fig. 32 may be a record of subsidence and not of an upwelling of cool water. This conclusion receives further support from observations of a seasonal character given on pp. 169- 171 Fip CT F'g- 3'- Distribution of tem
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