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全文: "極東風"
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  • 矢沢 大二
    地学雑誌
    1970年 79 巻 5 号 297-299
    発行日: 1970/10/25
    公開日: 2009/11/12
    ジャーナル フリー
  • 石岡 圭一, 山田 道夫, 林 祥介, 余田 成男
    日本流体力学会誌「ながれ」
    1999年 18 巻 6 号 410-411
    発行日: 1999/12/31
    公開日: 2011/03/07
    ジャーナル フリー
    Time-evolutions of decaying turbulence in two-dimensional non-divergent fluid on a rotating sphere were conducted with high-resolution numerical model to examine what stream pattern appears finally.
    To investigate the condition needed for each pattern to appear in detail, higher-resolution model are used and wider parameter range of initial condition or angular velocity of sphere rotation are swept than other past researches on the same subject.
    As a result, it is confirmed that the appearance of easterly polar vortex when the angular velocity of sphere rotation is rapid is a robust feature. Furthermore, it turned out to be necessary for band structure of zonal flow to appear in middle and low latitudes that initial energy must be injected into small scale enough as well as the angular velocity of sphere rotation is rapid.
  • 村瀬 信夫
    気象集誌. 第2輯
    1941年 19 巻 3 号 83-87
    発行日: 1941/03/05
    公開日: 2009/02/05
    ジャーナル フリー
  • 櫻庭 信一
    気象集誌. 第2輯
    1939年 17 巻 7 号 296-298
    発行日: 1939/07/05
    公開日: 2009/02/05
    ジャーナル フリー
    Take the x-and y-axis east-and northwards respectively, and let the general westerly wind be U(y), then Here u and υ denote the velocity components associated with wave motion. The equation of continuity is then the instability of wave motion sets in only when β is complex.
    The vorticity of the steady motion is 1/2 dU/dy If throughout any layer the vorticity is constant, d2U/dy2 vanishes and wherever β+αU does not also vanish. When there are several layers in each of which the steady vorticity is constant the various solution of the form (4) are to be fitted together, the arbitrary constants being so chosen as to satisfy certain boundary conditions. The first of these conditions is evidently The second may be obtained from the continuity of pressure across the boundary. Thus when U(y) is continuous across the boundary. At a fixed wall, of course Under these circumstances the examinations of stability coincides with Lord Rayleigh's investigation on the stability of certain fluid motions. Thus it may be concluded that in the isolated system of west wind zone the wave motion of any wave length is stable and has no chance of transforming into vortical motion, but on coupling with the east wind zone such as the equatorial trade wind zone or the polar east wind zone, the wave motion becomes unstable and transforms into vortical motion when the wave length is large compared with the breadth of the wind zone. The critical wave length is estimated to be about 10, 000km, which is too large compared with the cyclone wave of wave length 1000km. This discordance may be ascribed to the much simplified assumptions adopted here.
  • 村瀬 信夫
    気象集誌. 第2輯
    1936年 14 巻 5 号 255-263
    発行日: 1936年
    公開日: 2009/02/05
    ジャーナル フリー
  • 早瀬 吉雄
    水利科学
    1994年 38 巻 5 号 1-23
    発行日: 1994/12/01
    公開日: 2019/04/30
    ジャーナル フリー
  • 田中 潔, 羽角 博康, 小松 幸生, 伊藤 幸彦, 柳本 大吾, 坂本 天, 仁科 慧, 道田 豊
    日本水産学会誌
    2017年 83 巻 4 号 644-647
    発行日: 2017年
    公開日: 2017/08/07
    ジャーナル フリー
  • 照明学会雑誌
    1928年 12 巻 5 号 251-254
    発行日: 1928年
    公開日: 2010/10/27
    ジャーナル フリー
  • 櫻庭 信一
    気象集誌. 第2輯
    1936年 14 巻 5 号 263-274
    発行日: 1936年
    公開日: 2009/02/05
    ジャーナル フリー
    There are at present two dominant theories of essentially differnet mechanism on the existence of the high pressure belt of subtrooical latitude (subtropische Hochdruckgürtel, for brevity hereafter will be call “subtropical high”), whose development and decaying of intensity and migration of the location in the course of year have unseparably intimate relation with our climatic circumstances, in conjunction with the high and low pressure system developing over the continent and ocean (High and Low of Monsoons). This is the very reason why we n_??_me it “the active center of the atmosphere”. Thus it is one of the most important problem in the the_??_ry of the general circulation of the atmosphere to investigate the mechanism of subtropical high. One of them is the theory inheren from W. Ferrel, in which he assumes the conservation of angularmomentum referred to the rotation axis of the earth in spetially fixed coordinate and the complete rest of the atmosphere relative to the rotating earth at a certain stage of the earth's history. In this theory the effect of friction is discar_??_el. Indeel W. Ferrel succeeded in determining the location of subtropical high, but his hypothetical conditions are generally unrealizable on our globe. (This throry will be named “dynamical theory, dynamische Theorie” in the present paper).
    The other is the theory by Oberbeck and others, in which the distribution of air temperature constitutes the cssential factor in deciding the subtropical high (This theory will be named “thermic theory, thermische Theorie”).
    In this paper the latter thermic theory is supported, and finally the mechanism of subtropical high and that of high and low pressure system accompanying monsoon wind are condcluded to be essentially the same.
    Next, in order to explain the mechanism of monsoon high and low has seen introduced the term “Cyclo-and Anticyclogenesis of Oberbeck's type”, in consideration of the analogy with that in the theory of air mass.
    This means “in the northern hemisphere, the current system of warm air in the south and cold air in the north results in the formation of anticyclonic motion and that of cold air in the south and warm in the north result in the formation of cyclonic motion (This result has been derived in my previous pa_??_er. On the Effect of the Distribution of Continent and Ocean upon the Geaeral Circulation of the Atmosphere and the Theory and the Theory of Monsoons, Geophys. Mag. Vol. IX).”
    The above theme is the generalized one of Oberbeck's theory. Here warm and cold air mean that of positive and negative deviation from normal temperature respectively, viz. in the problem of planetary circulation the normal temperature denotes the equilibrium temperature and in the problem of non-planetary circulation the normal temperature has to be replaced by the temperature corresponding to the planetary circulation.
    As annual mean, in the tropical region the air temperature ove the continent is higher than that over the ocean on the same hatitude and reversed in higher latitude, the critical latitude being supposed to be about 45°, as is evident from, say, Spitaler's formula.
    Such a distribution of non-planetary temperature constitutes the essential factor in determining the high and low pressure system developing over continent and ocean, namely on the continent warm air exists in the south and cold air in the north, the location of juxtaposition of both currents being at latitude 45°.
    This distribution of current system corresponds to anticyclogenesis of Oberbeck's type and may be compared to the Siberian High in win'er seasons.
    The same is said of cyclonic motion over the ocean.
  • 地理学評論
    1961年 34 巻 6 号 344-359_1
    発行日: 1961/06/01
    公開日: 2008/12/24
    ジャーナル フリー
  • 安藤 定雄, 平山 次清
    日本造船学会誌
    1981年 626 巻 363-369
    発行日: 1981/08/25
    公開日: 2018/03/30
    解説誌・一般情報誌 フリー
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