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Volume 3 (1952 - 1953･･･
- Issue 4 Pages 229-
- Issue 3 Pages 175-
- Issue 2 Pages 77-
- Issue 1 Pages 1-
Volume 3, Issue 1
Displaying 1-8 of 8 articles from this issue
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S. Ooi, S. Matsumoto, H. Itoo, A. Arakawa1952 Volume 3 Issue 1 Pages 1-11
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSThe condition of upper atmosphere is investigated with relation to cyclones. The strongly deepening cyclones areas sociated with the typical westerly troughs which have a characteristic structure. On the other hand, cyclones can hardly develop in some period. The northward displacement of cyclones is remarkable in front of a typical westerly trough and is related to the distribution of westerly wind velocity.View full abstractDownload PDF (2046K) -
H. Arakawa1952 Volume 3 Issue 1 Pages 12-18
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSUsing the velocity profile with maximum zonal wind at about 26.5° latitude, and assuming the conservation of the absolute vorticity, the author derived the stream function for the finite perturbation motion. The method of analysis used is quite similar with that given in papers by HAURWITZ, CRAIG, NEAMTAN and H(/)ILAND. The streamlines associated with small stationary perturbations and the streamlines associated with relatively large stationary perturbations are drawn as examples. In the former case, the streamlines surround the pole and the effects of the disturbance appear as north-southerly undulations or meanderings of the streamlines. In the latter case, the basic westerly flow splits into two separate branches. Each of these branches transports an appreciable mass, and a dynamic high occurs just south of the northern current branch and a dynamic low just north of the southern branch. This may offer a simple explanation for the kinematics of blocking action on the rotating spherical earth.View full abstractDownload PDF (867K) -
H. Arakawa1952 Volume 3 Issue 1 Pages 19-25
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSSolutions of the GRIMES type are derived in both spherical polar coordinates and cylindrical coordinates. It is pointed out that solutions of this type have the close relationship with the law of conservation of angular momentum.View full abstractDownload PDF (760K) -
- Periodicities in Meteorological Phenomena -K. Takahashi, Collaborators1952 Volume 3 Issue 1 Pages 26-40
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSPredominating periods of daily pressures at several stations in Japan were investigated by harmonic analysis. W e found 5-,12-13-day and probably 4- and 10-day periods predominated throughout the year. Analysing 5-day mean values of pressure and temperature deviations from the normal at some stations over Asia and the North Pacific, we found 25-,35-,4 5-, and 65-day periods predominated. The latter long periods coincide with the values which were analysed formerly by s o-called periodogram analysis.5- and 9-month periods were als o found to predominate. Assuming such a long period,5-day mean pressure at the stations over the Northern Hemisphere was analysed by harmonic analysis, and we found that they were expressed approximately by a regular standing oscillation of pressure over the earth. Next,8-day period of pressure ove r the Northern Hemisphere was analysed by similar methods, and such an oscillation was suggested to be an internal wave of atmosphere.
Among many short periods,4-day period at 500 mb level over the Northern Hemisphere was investigated in detail.8or 9 planetary waves round the Northern Hemisphere seem to be the origin of the 4-day period. Heights of 500 nib level along latitude 50° N in winter were analysed into elementary sinusoidal waves by harmonic analysis and two, kinds of waves, one a stationary and the other a propagating wave, were found. It was found that long waves propagate' towards the west and short waves towards the east. Thus, modes of the oscillation of long periods and short periods are quite different.
Some trials of long range forecasting we r e made, assuming such periodicities. Analysing the pressure variations of several stations to the elementary oscillation and extrapolating such elementary oscillation to the future and adding them, the forecasted values of pressure are obtained.View full abstractDownload PDF (2201K) -
M. Sanuki1952 Volume 3 Issue 1 Pages 41-53
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESShree- and four-bladed windmill-anemometers and cupanemometers are started from rest in the wind tunnel and are also stopped from rotation in a still air, and their responses are compared with one another. The static torque coefficients are calculated from the observation of rotational speed versus time to be used in SCHRENK's parameter. SCHRENK's overestimation factors for both anemometers are evaluated into a single chart for rectangular wind waves. For sinusoidal wind waves, graphical solution of the equation of motion is carried out, from which the over-estimation factor is computed and compared with experiment due to DEACON. The phase lag is also obtained into a chart.View full abstractDownload PDF (1621K) -
M. Sanuki, N. Tsuda, S. Kimura1952 Volume 3 Issue 1 Pages 54-63
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSTwo types of wind shield for rain gauge, i. e., conical and hollow ring-shaped designs are tested in combination with in tegral and separated equipment housings, both in water tank and in wind tunnel. The flow patterns are photographed by mea ns of aluminium powder spread over the water surface of the tank, or wool strings tied to the model in the wind tunnel. By the inspection of the photographs taken in two-dimensional aspect in water tank, together with those taken in three-dimensional aspect in wind tunnel, the conical wind shield wi th a flat circular edge combined with separated housing is found to be th e most satisfactory, giving uniform horizontal flow and generating the minimum of eddies around the rain gauge funnel mouth.View full abstractDownload PDF (3748K) -
T. Sato1952 Volume 3 Issue 1 Pages 64-67
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSHere we derived the inte g r a l s from the equations of horizontal motion in the case of spherical coordinates under the s a m e assumptions as in Part 1. The " horizontal motion " which i s called here means of course the motion on a spherical surface. The derived integrals express the same law of conservati o n of vorticity and energy respectively as in Part 1.View full abstractDownload PDF (399K) -
T. Sato1952 Volume 3 Issue 1 Pages 67-69
Published: August 31, 1952
Released on J-STAGE: December 11, 2012
JOURNAL FREE ACCESSHere we derived a vorticity integral from the equations of motion under the following three assumptions: (A) motion is horizontal, (B) fluid is friction less, (C) fluid is autobarotropic. Adopting t h e above assumptions, it is known from the equation of continuity that momentum can be expressed b y applying stream-surface functions. Thus, we can obtain a vorticity integral from the equations of motion. The integral expresses a conservation law in a world of space and tim e, but not a conservation law in the ordinary space. We treate d only the case in Cartesian coordinates.View full abstractDownload PDF (335K)
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