地球自轉速率年变化的一个可能進一步的解釋

A POSSIBLE EXPLANATION OF THE ANNUAL VARIATION OF THE ANGULAR VELOCITY OF THE EARTH’S ROTATION

中文摘要:

      把大气和地球看成一个孤立的系统,则此系统之总角动量不改变。从冬到夏地球本身的角动量增加,则同一时期大气的总角动量减少,但是低层大气(从地面到800毫巴)的平均西风环流夏季反而强於冬季,因此作者认为:从冬到夏近地面西风环流的这种加强,可能就是同一期间地转角速加快的原因;同时也可能是夏季大气角动量消耗率较高的原因。

英文摘要:

      It is founded by several authors that: the total angular momentum of the atmosphere decreases from winter to summer, compensating tho increase of the angular momentum of the solid earth in the same poriod (principle of conservation of total angular momentum of an isolated system). However the average (over the globe) westerly circulation in the lower atmosphere(from 800 mb to surface) is stronger in summer than in winter. It is the authors, opinion that: it may be this increase from winter to summer of the westerly circulation near tho earth's surface, that speeds up the angular velocity of the earth's rotation from winter to summer. It may also be this increase that causes a higher rate of destruction of atmospheric angular momentum in summer, thus diminishing the total amount of the angular momentum from winter to summer.