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Volume 15 (1964 - 196･･･
- Issue 3-4 Pages 167-
- Issue 2 Pages 93-
- Issue 1 Pages 1-
Volume 15, Issue 1
Displaying 1-5 of 5 articles from this issue
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Tomio Asai1964 Volume 15 Issue 1 Pages 1-30
Published: August 25, 1964
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSThe numerical experiments are tried in a simple two dimensional atmospheric model in order to investigate the evolution of a cumulus convection from a dynamical aspect.
In the first place, a system of the equations governing a thermal convection in cumulus scale is derived by making use of the perturbation method. It is suggested, especially, that the assumption of non-divergent motion is appropriate and the introduction of eddy exchange is inevitable.
Secondly, a non-linear system of the equations designed on the basis of the perturbation analysis is integrated numerically for some cases during several tens of minutes. An isolated convection 5 km thick and 10 km wide is investigated assuming the pseudo-adiabatic process in some conditionally unstable layers at rest. The convection is further assumed to be without supply of energy through the boundary of rectangular domain.
In general, a lifetime of convection ranges from 20 to.30 min. The development in an early stage of the convection is characterized by the intensification of convective circulation associated with narrowing an updraft region. Immediately after the convection attains the mature stage with maximum upward velocity and rate of condensation, it plunges into the decaying stage with damping oscillation.
Finally a great difference between the co n vections in warm and cold layers is illustrated.View full abstractDownload PDF (3830K) -
E. Suzuki1964 Volume 15 Issue 1 Pages 31-51
Published: August 25, 1964
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSAs a unified functional model of frequency distribution of the variouE amounts of precipitation, hyper Gamma distribution function, is proposed to contain the past several functional distributions as the special cases by author.
Moment estim a tes and maximum likelihood estimates of parameters, α, β and υ are studied and variance matrix of maximum likelihood estimates is asymptotically gained, and test result of fitness to actual frequency distribution shows the satisfactory fittness exceeding the fast functional types.
Several necessary diagrams to gain moment estimates are supplemented for this paper.View full abstractDownload PDF (2468K) -
K. Ninomiya1964 Volume 15 Issue 1 Pages 52-70
Published: August 25, 1964
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSThe winter weather in 1963 was unusually severe over the Far East, where abnormal cold was accompanied with blizzards notably in the northwest coastal area of the Japan Islands. Heat budget over the Japan Sea and the Japan Islands are analysed during the tenday period of the most severe weather from Jan.16th to Jan.26th. From the results of computation, it is concluded that the amount of sensible heat supplied from the Japan Sea is as much as 1100 ly⋅day-1 and is several times as large as the amount of heating due to the condensation and radiation. Also it is found in the comparison with the synoptic weather situations that the amount of sensible heat supply remarkably increases in front of cold vortex in the troposphere. As for the heat budget over the Japan Island, it is concluded that large portion of heating is due to the released latent heat.View full abstractDownload PDF (2467K) -
On the Peculiar Nature of ForeshocksS. Suyehiro, T. Asada, M. Ohtake1964 Volume 15 Issue 1 Pages 71-88
Published: August 25, 1964
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSA small perceptible earthquake and its 25 foreshocks and 173 aftershocks were recorded by a special tripartite observation of high sensitivity set up in the Matsushiro Seismological Observatory. A substantial difference was found between the foreshocks and aftershocks in the relation of frequency of occurrence and magnitude, i. e. the coefficient“b”in Gutenberg-Richter's formula is only 0.35 in the former as against 0.76 in the latter. This is discussed with the general seismicity of the region.
Some relations between main shocks and their aftershocks have been found to hold good also in the present example of a miniature size; namely, the main shock occurred on the margin of the foreshock and aftershock region, and the size of the region is as small as expected from the magnitude of the main shock.View full abstractDownload PDF (2150K) -
Y. Miyake, Y. Ohtsuka1964 Volume 15 Issue 1 Pages 89-92
Published: August 25, 1964
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSBeryllium-7 in Tokyo rain water which is produced in the upper atmosphere through the spallation of air molecules by the cosmic ray was determined. The content of Be-7 in rain water ranged from 0.7to 5.7×103atoms per millilitre which is about the same as in other observations at different places. The calculated amount of Be-7 in the rain-bearing air-column above the ground is much greater in the cold frontal type of rainfall than that in the warm front.View full abstractDownload PDF (506K)
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