Introductory Meteorology

Introductory Meteorology

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ... much faster than the storm center. But they also are fairly common in the midst of "highs" due, presumably, to a mechanical or bodily lifting of the upper air of these regions, or overrunning of air in the general circulation, and, consequently, dynamical cooling not only of the stratosphere, as abundantly shown by the records of sounding balloons, but also of the topmost portion of the troposphere where cirri usually form. It has been suggested that cirri often are caused by cooling in place by radiation, but, as already explained, this appears to be improbable for clouds so broken and discontinuous. On the contrary, however, it seems likely that through free radiation and cooling at night they often sink to lower levels, get warmer and evaporate. Thermal and mechanical convection, therefore, the first prevailing in tropical regions, the second, presumably, in extratropical, appear to be the only abundant causes of cirri. The excessively low temperatures at which cirri are formed, generally--30 C. to--50 C, necessitate their being tenuous (at such temperatures there is but little water vapor to condense) and practically insure (exceptions have been reported1) that they shall consist of ice needles. Cirro-stratus (Ci.-St.).--When cirrus clouds thicken, as they usually do on the approach of a cyclonic storm, they gradually merge into a broad cloud layer, having the appearance of a more or less continuous white veil of uneven and often fibrous texture (Figure 51), to which the name cirro-stratus has been given. Its altitude is nearly that of the cirrus, of which indeed it is only a dense and extensive form, though its under surface is not so high. Like its forerunner, the thinner cirrus, it also consists of ice crystals, as is more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236489292
  • 9781236489296