. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 282 DISCOVERY REPORTS water movements in the Benguela current, and is a diagrammatic and somewhat idealized version of them, but we feel that it is a fair representation of the circulation which is probably common to the major upwelling regions (but the mirror image of those in the northern hemisphere). A striking feature of the Peru current is the very large apparent size of the anti-cyclonic eddies, which far exceed the dimensions of those found in the Benguela and California currents. There i
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 282 DISCOVERY REPORTS water movements in the Benguela current, and is a diagrammatic and somewhat idealized version of them, but we feel that it is a fair representation of the circulation which is probably common to the major upwelling regions (but the mirror image of those in the northern hemisphere). A striking feature of the Peru current is the very large apparent size of the anti-cyclonic eddies, which far exceed the dimensions of those found in the Benguela and California currents. There is some indication that these large eddies off Peru may conceivably have within them smaller eddies, but in themselves they appear to be peculiar to the Peruvian coast, and one can only assume that it must be constancy in the driving forces which enables them to persist and achieve such large Fig. 96. A perspective diagram showing an idealized picture of the principal horizontal and vertical water-movements in the process of upwelling. The isosteres are represented by the thin lines on the 'cut' faces of the water masses. The shaded sinuous line on the sea-surface represents the continuation of the boundary convection between the upwelled and oceanic surface-waters. The name of the deep compensation current has been abbreviated. The Peru current itself, of course, is very much more extensive than any of the other upwelling regions, for it runs along the South American coast for nearly 2000 miles. Furthermore it is unique in having within its range the subtropical convergence, and consequently involves subantarctic waters in addition to subtropical waters. By comparison the subtropical convergence in the South Atlantic lies well to the south of South Africa (Deacon, 1933). In spite of its great size, however, the Peru current has a slightly smaller negative temperature anomaly ( — 8° C.) than the Benguela (— 9°C), and both exceed by far that off California (
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