【摘要】 <正> 当氣球無洩氣情况時,300毫巴以下每升高4公里升速約增加7—8％。根據風洞及实驗大氣中氣球升速特性之实驗,指出C为雷諾数R之函数。对C來说,R有一臨界值,当R处於臨界區内,C隨R減少而增加极快,因之氣球升速也当隨R之減少而激烈下降。当R处於臨界區以外C可看為常数。臨界區的範圍約在R=更多还原

【Abstract】 In the winter of 1945-46, there existed frequently a deep stable layer in the lower troposphere. The upper boundary of this stable layer was at a height of about 3-4 km and the lower boundary might reach the ground It was very often that there might be another deep stable layer in the middle or upper troposphere. The original data of rawind and rasonde systems showed that as the balloons passing through these layers the rate of ascent changed noticeably. The following relation between the rate of ascent of balloons and stability of the layer of the atmosphere usually holds.:when —（W₂-W₁）>0 , stability is large,—（W₂- W₁）<0 , stability is low,whereW₂ and W₁ are the rate of ascent of balloon at the upper and lower surfaces of the layer. According to the character of the spherical balloon, When the value of Reynolds number is larger than 4×10⁵ （in our case this value occoured at about 400 mb level）. Hergsells formulae for the rate of ascent may hold constant specific resistance. It leads to the conclusion that the above stated stable layers were in close relation to the vertical motion below 400 mb level. Mean speed of vertical motion at various levels bellow 400 mb in the months of January and February 1946 were also estimated.更多还原