Report on the scientific results of the voyage of during the years 1873-76 : under the command of Captain George SNares, , Captain Frank Turle Thomson, . f the Ganges has a moist atmosphere and a (PHYS. CHEM. CHALL. EXP.—rAUT V.—1889.) C ll 74 THE VOYAGE OF CHALLENGER. large rainfall, the western half of it is singularly dry and practically rainless, and itscentral portion occupies a region where at the time the climate is one of the driest andhottest found at any season anywhere on the globe. Hence, while observation showsthe vapour to be the most impo
Report on the scientific results of the voyage of during the years 1873-76 : under the command of Captain George SNares, , Captain Frank Turle Thomson, . f the Ganges has a moist atmosphere and a (PHYS. CHEM. CHALL. EXP.—rAUT V.—1889.) C ll 74 THE VOYAGE OF CHALLENGER. large rainfall, the western half of it is singularly dry and practically rainless, and itscentral portion occupies a region where at the time the climate is one of the driest andhottest found at any season anywhere on the globe. Hence, while observation showsthe vapour to be the most important and widespread of the disturbing influences atwork in the atmosphere, the temperature also plays no inconspicuous part directly indestroying the equilibrium of the atmosphere; from which disturbance result winds,storms, and many other atmospheric changes. Annual Range of the Mean Monthly Pressure.—This has been calculated fromthe sea-level pressures by simply subtracting the lowest mean monthly pressure fromthe highest, and entering the difference in its place on a map of the globe from whichthe lines of equal difference were drawn, as shown in the accompanying Fig. Fig. 3. Chart sbowing the annual range of the mean monthly pressure over the globe, expressed in hundredths of an inch. The greatest difference occurs in the interior of Asia, near Urga, to the south-south-west of Lake Baikal, amounting to one inch. Thus in this region a thirtiethpart of the whole winter pressure is removed during the summer months. In BritishAmerica the difference is about 0-40 inch, and this is also the difference in SouthAfrica. In South America and in Central Australia it amounts to 030 inch. Theseall occur in continents, and the largest difference is in the largest continent. On theother hand, in the North Atlantic, between Iceland and the south of Greenland, andagain in the North Pacific to the south of Alaska, the difference is 040 inch; but in noother part of the ocean is the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscientificexpedition
