Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
Volume 27 , Issue 12
Showing 1-8 articles out of 8 articles from the selected issue
  • The Vertical Distribution of the Wind Velocity near the Earth's Surface, (II)
    K. Takeda
    1949 Volume 27 Issue 12 Pages 363-370
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    The experimentally obtained logarithmic fovmula of the wind velocity
    where u denotes the wind velocity and Z the height, α and Z0 being constants, is examined in the light of data of Best, Heywood and Hellmann. The formula represents well the data of Best and Heywood but not that of Hellmann. The author considers that this reveals the deficiency of the experimental formula.
    Hence a new formula of the eddy viscosity in the stratified atmosphere is deduced, where K. and K denote thee ddy viscosity in the stratified and the adiabatic atmosphere respectively, β the Rossby constant, and Ri the Richardson number.
    The author further discusses the controversy between Sutton and Sverdrup on the velocity distribution and supports Sutton.
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  • K. Takahasi
    1949 Volume 27 Issue 12 Pages 370-372
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    The author found periodicities of 4.4, 7 and 9 years in the annual amount of precipitation at Tokyo by periodgram analysis, and shows the-possibility of seasonal forecasting by extrapolating the yearly values with such assumptions.
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  • H. Hatakeyama
    1949 Volume 27 Issue 12 Pages 372-376
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    The Volcano Yake-yama, Niigata prefecture, erupted at 8h in the morning of Feb. 5th, 1949. The cloud of the eruption-smoke was carried away by the west-northwesterly monsoon to the Kashimanada and the volcanic ashes fell on the northern part of Kanto district. On this day, the Benndorf's electrometer of the Kakioka Magnetic Observatory recorded a large bag-type disturbance exceeding 1200 volts per meter between 11h and 12h. After 12h, the value of the atmospheric potential gradient remained as a small negative value, and after 16h, it returned to its normal value.
    The author considered the model distribution of the electric charge to explain the disturbance of the potential gradient. We have the aerological data which confirm that the height of the smoke-cloud was lower than 4.5km. Therefore, we took the height as 4km and estimated the distribution of the electric charge. It is natural to consider the distribution of electric charge in the cloud as spindle-type. We assume a column of point charges which have the following electric charges respectively,
    2, 3, 5, 7, 8, 9, 10, 10, 10, 10, 10, 9, 8, 7, 5, 3, 2, and the distance between the consecutive charges is assumed to be 4km, and the speed of the smoke-cloud to be 72km per hour. The distribution of the potential gradient under such assumption is shown with figure in the text. The sum of the electric charge which makes the spindle-type distribution is -0.55 coul. It is nearly the same order of magnitude with the case of the Volcano Asama-yama, in which the electric charge was estimated as -1.4 coul or -0.13 coul.
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  • E. Suzuki
    1949 Volume 27 Issue 12 Pages 376-380
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    In my former report, I discussed on the autocorrelation coefficient of difference time series. In this paper, I point out some properties of time series that are investigated by taking difference, and discuss apparent periodicities coming out in the higher order difference series of purely random time series. Namely, according to E. L. Dodd, if {Xt} is purely random series the apparent period T of difference series {_??_nXt} is given by where, in our case, b0=1, bn+1=(-1)n+1, Besides, corrections and supplements for the former report are appended.
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  • H. Matsui
    1949 Volume 27 Issue 12 Pages 380-381
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    From April 1948 to March 1949, the content of the hydrogen peroxide of the rain and snow waters in Kanagawa Prefecture was chemically estimated.
    From the analytical data, the author obtained the following results.
    1. Max. 0.86mg/l, min. 0.08mg/l. The yearly average; 0.52mg/l.
    2. H2O2 content is larger in rain water than in snow water.
    3. In the annual variation a maximum occurs in June and a minimum in January. There is a parallelism between the yearly variation of the hydrogen peroxide and the ultra-violet ray in the solar radiation. This suggests that the ultra-violet ray produces the hydrogen peroxide in the presence of water particles suspended in the atmosphere.
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  • H. Matsui
    1949 Volume 27 Issue 12 Pages 381-382
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    The method of determining ozone in the atmosphere is based on the oxidation of potassium iodide. The author studied the influence of the coexistence of other oxidizing agents with ozone.
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  • H. Matsui
    1949 Volume 27 Issue 12 Pages 382-383
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
    In this paper, the author studied the atmospheric ozone in Kanagawa Prefecture observed during July 1948-June 1949.
    The results obtained are as follows:-
    1. Max. 1×10-7g/l, min. trace. The yearly average; 1.5×10-8g/l.
    2. The proportion of ozone in the atmosphere is greater in winter than in summer.
    3. Air mass may possibly exert some influence in modifying ozone content.
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  • [in Japanese]
    1949 Volume 27 Issue 12 Pages 384
    Published: 1949
    Released: February 05, 2009
    JOURNALS FREE ACCESS
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