Thalassa; an essay on the depth, temperature, and currents of the ocean . tter ;while in the polar regions, the fresh but cold surface-waterproduced by the melting of the ice will, on becoming more saltby its admixture with the surrounding water, sink in its turnand lower the temperature of the strata with which it comes incontact. The final result of these exchanges of temperature, whichconstitute what may be called the vertical circulation of theoceanic waters, appears in the oblique position, and the con-sequent spreading out of the isotherms as we recede from theEquator (Plates 9 and 19).
Thalassa; an essay on the depth, temperature, and currents of the ocean . tter ;while in the polar regions, the fresh but cold surface-waterproduced by the melting of the ice will, on becoming more saltby its admixture with the surrounding water, sink in its turnand lower the temperature of the strata with which it comes incontact. The final result of these exchanges of temperature, whichconstitute what may be called the vertical circulation of theoceanic waters, appears in the oblique position, and the con-sequent spreading out of the isotherms as we recede from theEquator (Plates 9 and 19). The isotherm of 5° C, for example,which near the Equator is found at a depth of 300 fathoms, ismet with at 600 fathoms in lat. 50° S. in the Southern Ocean,and at 800 fathoms in lat. 50° N. in the North Atlantic. The Southern Ocean is the main feeder of its three giganticoffshoots—the Atlantic, the Pacific, and the Indian Oceans, whichit supplies through the medium of both surface and under-currents. The former, driven by the westerly winds against Cv] O 2 •OO o. spuiM AHS3Mlsuj|e3isspeJi3 Ml sujieo isopeji 3§ sujieo spui/w ^l^^A^uoi^ay xiiagx uoi^aa X 1199 X uoi?ay x nsgx uoj^ayx C— uiseg 0|UB930
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Keywords: ., bookcentury1800, bookdecade1870, bookidthalassa, booksubjectocean
