:c-pm^^^a-:/f^'ji'xi~.f] :(1t^ ft??Ä ^^m, ^t mr^ m» f3 3ê JtftTHEJOURNALOF THECOLLEGE OF SCIENCEIMPERIAL UNIVERSITY OF TOKYO.Vol. XLI.PUBLISHED BY THE UNIVEESITY.TOKYO. JAPAN.1917—1921.TAISHO 6-10.Committee,PublishingDirector of the CollegeProf. Bigakuhakushi, (exS. Goto, officio).Prof. I. Ijima, Ph. D., Bigakuhakushi.Prof. F. Ömori, Bigakuhakushi.Prof. S. Watasé, Ph. D., Bigakuhakushi.— — —CONTENTS.:and Tukamoto1. T. Terada, M. ]\iuti J. On diural variation ofArt.Publ. November 20th, 1917.barometric pressure.:Y. Shibata and T. Muraki Mesotomisation of diammine-Art. 2.complex and determination of the configura-dinitro-oxalo-cobaltdiammine-tetranitro-cobalt complex.tions ofthis complex and ofNovember 30th, 1917.Publ.: on the distrib ition of theArt. 3. K. Hirayama —Researches meanWifJi 1 plate. Publ. March 30th,motions of the asteroids.1918.:4. M. Kuntieda —Asymptotic formulae for oscillating Dirichlet'sArt.Publ. April 30th, 1919.coefificients of power series.integrals and:Ishimoto and M. Imamura —On the effectT. Terada, M. ofArt. 5.Publ. June 13th,topography on the precipitation in Japan.1919.:Y. Shibata Recherches sur les spectres d'absorption desArt. 6.III. Spectres desammine-complexes métalliques.chrome et de cuivre. Avec 18sels complexes de nickel, dePubl. March 20th, 1920.figures.:7. Yamada Magnetic separations of the lines of iron, nickelArt. K. —Publ. Februarydifferent fields. With 20 plates.and zinc in28th, 1921.of ...
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THE
JOURNAL
OF THE
COLLEGE OF SCIENCE
IMPERIAL UNIVERSITY OF TOKYO.
Vol. XLI.
PUBLISHED BY THE UNIVEESITY.
TOKYO. JAPAN.
1917—1921.
TAISHO 6-10.Committee,Publishing
Director of the CollegeProf. Bigakuhakushi, (exS. Goto, officio).
Prof. I. Ijima, Ph. D., Bigakuhakushi.
Prof. F. Ömori, Bigakuhakushi.
Prof. S. Watasé, Ph. D., Bigakuhakushi.— — —
CONTENTS.
:and Tukamoto1. T. Terada, M. ]\iuti J. On diural variation ofArt.
Publ. November 20th, 1917.barometric pressure.
:Y. Shibata and T. Muraki Mesotomisation of diammine-Art. 2.
complex and determination of the configura-dinitro-oxalo-cobalt
diammine-tetranitro-cobalt complex.tions ofthis complex and of
November 30th, 1917.Publ.
: on the distrib ition of theArt. 3. K. Hirayama —Researches mean
WifJi 1 plate. Publ. March 30th,motions of the asteroids.
1918.
:4. M. Kuntieda —Asymptotic formulae for oscillating Dirichlet'sArt.
Publ. April 30th, 1919.coefificients of power series.integrals and
:Ishimoto and M. Imamura —On the effectT. Terada, M. ofArt. 5.
Publ. June 13th,topography on the precipitation in Japan.
1919.
:Y. Shibata Recherches sur les spectres d'absorption desArt. 6.
III. Spectres desammine-complexes métalliques.
chrome et de cuivre. Avec 18sels complexes de nickel, de
Publ. March 20th, 1920.figures.
:7. Yamada Magnetic separations of the lines of iron, nickelArt. K. —
Publ. Februarydifferent fields. With 20 plates.and zinc in
28th, 1921.
of iron lines in different8. Y. Takahashi :--Magnetic separationsArt.
Publ. February 28tb, 1921.fields. With l3 plates.
T. des relativ Abel'schen Zahl-Art. 9. Takagi :—Ueber eine Theorie
3 1st, 1920.körpers. Publ. July
: configuration of theK. Matsuno —On the stereochemicalArt. 10.
salts. Publ.and diammine cobalt complexaquotriammine
March 31st, 1921.
: sulphide sol byArt. 11. K. Matsuno —The coagulation of arsenious
1921.cobaltic complexes. Publ. March 31st,
BY THE TOKYO PRIN 1 ING CO., LTD.PRINTED
~x^-^'^JOUllNAL OF THE COLLEGE OF SClENeF, TuKYO IMPERIAL UNIVERSITY.
VOL. XLT., ART. 1.
Diurnal Variation of Barometric Pressure.On
II. from the Geophysical Seminary(Contribution
in the Physical Institute, Co!lege of Science}.
By
Torahiko TeRADA,
Eg ikiihakusJii,
KlUTl, , JyunMasazô TUKAMOTO,
Eigakmh f, Eigakushi.
1. While the amplitudes and phases of the semidiurnal wave
of barometric pressure show a very regular distribution over the
the earth, the diurnal component dependentire surface of those of
remarkably on secondary local conditions, as was fully illustrated
by the classical investigations of A. Angot'^ and J. Hann.^^
According to the recent aerological investigations/^ the diurnal
daily of temperature is conspicuouscomponent of the variation
in the lowest kilometer of the atmosphere, and it seemschiefly
quite natural that the corresponding diurnal component of the
of the nature ofbarometric pressure is influenced by the variety
earth's surface within comparatively narrow extent.the underlying
moment the picture of the isobaric surface at aboutImagine for a
etc.,over land with irregular patches of water, desert2 km, a
up by the solar radia-while the earth's surface is rapidly heated
surface will be scattered over with numeroustion. The isobaric
theaccording to the nature of the substratum, andhills and dales,
subsist withoutresulting horizontal gradient of pressure cannot
the heatingthe flow of air tending to annul the gradient. When
Angot, Annales du Bureau Central Météorologique de France, 1887.1.) A.
49-121.uiath.-naturwis?. Kl., 55,J. Hann, Denkschriften d. kais. Akad. d. Wiss., pp.2.)
bei Lindenberg,Eeger, Arbeiten d. kon. preuss. aeronautischen Observatoriums 8, p.3.)
229.Art. l.-T. Terîlda:2
rapid, the state can be maintained, since the flow isis sufficiently
partly hindered by the friction of the underlying layer and also the
influence the Coriolis's force. The irregularity of smalldeviating of
due to the influence of the immediate neighbourhood will bescale
down as we proceed higher and higher, andgradually smoothed
of the remoter substratum will gradually come intothe influence
play.
The above idea is not at all essentially new, being entertained
among others.'^ Itby the authorities such as Hann and Angot
otherwise impossible to account -for the irregularseems indeed
nature of the geographical distribution of the diurnal components
as actually observed. As far as we are aware, there were however
these effects ofas yet no serious attempt made to consider local
more and to deduce anything in way ofconditions a little closely
some rules or laws from among the apparently intractablefinding
of materials. The present communication is the results ofchaos
some trials dared in tliis direction. Though far from laying an^^
of norserious claim on the rigorousness the method employed, on
exhaustiveness of the materials utilized, the essential featuresthe
some of the results given below may be of some interests forof
meteorologists.
2. The beginning of the present investigation dates back to
ofseveral years ago when the attention the one of the author was
simple chart by Buchan'\drawn })y the constructed showing
roughly the geographical distribution of the daily amplitude of
barometric pressure over the world. The dependency of the ampli-
tude on the distriljution of and water was so conspicuous thatland
it seemed quite feasible to infer some quantitative relation between
the amplitude and the proportion of land and water over a certain
definite area. To carry out the comparison, the following procedure
was taken. The amplitudes variation at differentof the pressure
20° 40°points on the circles of latitude and respective!}' were
estimated from the chart by interpolation and plotted in a diagram
1.) e. (/. Bürnstoin, Wiener Borichto, 2a, 721 Met. Z.S., 837.113, 1904, p. ; 7, p.
Buchan,2.) Challen>fer Report, Phys. and Clieui. 2, Report on Atmospheric Circulation,
p. 21, Fii,'. 2.