Geography of the AirGreely, A. W. (Adolphus Washington)
Science
Geography of the Air
Greely, A. W. (Adolphus Washington)
Geography; Meteorology
Partsch, writing on evidence of climatic changes within historical
times in the Mediterranean region, remarks that too much attention has
been given to changes in crops, the introduction of plants, and the
limits of domestic animals. He states that existing information as to
the harvest time of ancient days indicates an unchanged climate, while
the land-locked lakes in Tunis, which afford the best evidence on
rainfall variation, show absolutely no climatic change.
* * * * *
{47} Van Bebber, in writing on weather types, claims that a line drawn
from the center of a cyclone perpendicularly in the direction of the
heaviest gradients will in general be perpendicular to the subsequent
path of the "low," and that these lows leave high temperature on the
right hand.
* * * * *
Hill, in describing hail-stones and tornadoes in India, explains them
on the principle of the great diminution of temperature upwards in the
air, but a critic, in combating this theory, objects to the high and
low stations selected to show temperatures.
* * * * *
The so-called "weather plant" of the tropics has passed through the
process of investigation with the usual result. It appears surprising
that in these days it should be believed that any plant or animal can
foretell weather 48 hours in advance, particularly after considering
the vast amount of proof as to the enormous rapidity with which
weather-changes progress from day to day.
* * * * *
Hugo Meyer, in treating the precipitation of central Germany for the
ten years ending in 1885, pertinently remarks that the same
significance does not attach to the same rainfall for all places and
different times of the year, for this average value is not the amount
most likely to fall in any particular interval of time, since there is
a limit to the extent of the negative deviations on one side--that is,
0 or no rainfall, while on the positive side there is no limit. The
most probable depth of rainfall, therefore, is less than the mean
value, the preponderance of negative over positive deviations being
about 10 per cent. and sometimes as great as 20 per cent.
* * * * *
Professor W. M. Davis wrote an interesting review of Professor
Ferrel's popular treatise on the winds, published a year ago.
Commenting on the review, the editor of _Meteorologische Zeltschrift_,
Vienna, remarks on a very important omission in the treatise, namely,
the absence of all reference to the diurnal variation of the wind and
the many interesting relations it bears to other phenomena, a notable
omission in a treatise specially devoted to winds. The treatment of
the monsoon wind and its relation to the general circulation is highly
commended by the editor, and indicated as being all new.
* * * * *
Public-domain text, read in full here on John Shaqi.
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