Milford chronicle., 1906-05-04
CLIMATE OF THE UPPER AIR
Variation OF Temperature In Atmos-
phere at Great Height.

/ VARIATION
phere at Great Height
That at great heights, 10000 or 10000
feet. the seasons occur at different
times of the year from those on the
surface of the earth just below appears
from numerous measurements Of TEN
perature taken with sounding Dal-
looms" or small captive balloons con-
tanning automatically registering IN
struments.
The fact that midsummer comes IN
October in the upper air and lnidwln-
ter in April appears to have an I'M
portant influence on the weather OF
these months, as is noted in an article
in Ciel ct Terre, distracted in Cosmos.
The author first notes that the upper
air temperatures measured by the
method referred to above are surpris-
ingly low. He writes:
"Facts regarding thermic conditions
in the upper regions Of the atmosphere
are always of interest. Data collected
on this point several years ago by
means of sounding balloons caused
some astonishment, but nevertheless
they do not appear so remarkable when
we compare them with facts obtain
ed more recently, since aerostats ana
perfected devices have made it posi-
BILE for us to penetrate to still loftier
elevations.
ION Dec. 5, 1901, balloon sent up
at Trappes, near Versailles, by Teis-
serene de Bort reached the height of
46.9O4 feet. At this great height the
temperature was 90 degrees F. In the
same December a piece Of apparatus
sent up by Mr.. Rotch at st. Louis reg
istered 100 degrees F. ut 4S,544 feet.
These figures, which are actual rec
ords, have now been exceeded, as we
shall see, at least so far as the Eu-
ropean continent goes.
"In the Intercollegiate Zeitschrift
for July last R. Nimfuhr announces the
temperature registered on two Sound
ing balloons sent up from Vienna on
March 2 and April 4, 1905. The mini
ma recorded in these ascensiOns were,
on March 2, 121 degrees F. at 31,S12
feet, and on April 4, III degrees f. at
SO, 113 feet. These represent up to the
present day the extreme figures re-
corded in Europe.
''It is important to note in this re-
gard that in the elevated layers of the
atmosphere the fiuctuation Of the tenn
perature undergoes a well marked an
nual variation which, however, is not
parallel to that which is familiar to us
on the lower levels. The seasons in the
upper air are late, the greatest cold oc-
curing toward spring (the beginning
of ApriD and midsummer about the be-
ginning of October.
"This popularity has some influence
on the condition of the atmospheric
strata. The proverbial variability Of
the weather in spring results largely
from the fact that then the atmosphere
is generally in a state Of unstable
equilibrium, due to the cOldness and
consequent excessive weight Of the up
per layers in relation to the lower
which. being already somewhat warm
er, are lighter.
''Now we know that the equilibrium
of a mass of air is most stable when
the layers that are relatively warm
and light are above the colder ones.
This condition is most often realized In
autumn for the reason indicated above,
and the weather then is less variable.
Sometimes the upper air also under
goes extraordinary thermal variations
in the course of a day or two.
During the same lapse Of time the
distribution of barometric pressure and
temperature on the earth's surface re-
mains sensibly the same."-hterary
Digest.