海城地区震前低层大气增温的数值分析

NUMERICAL ANALYSIS OF HEAT INCREASE IN THE LOWER ATMOSPHERE PRIOR TO THE HAI-CHENG EARTHQUAKE (1975)

摘要:

本文提出了震前低层大气的增温原因,利用温度倾向方程,考虑了每一项加热因子。铅直速度项(对流项)的值为-8.6°/天(3日)、-3.8℃/天(4日),位于地面至970毫巴的薄层内,辐射项分别为+3.9℃/天、+3.3℃/天,水平输送项,+0.43℃/天,-0.8°/天,潜热项很小。感热项(下垫面感热通量)是从倾向方程中倒算出来的,似乎分别是7.4℃/天,3.8℃/天。然而平均气温的观测表明,在1-4日的一半时间内高于平均地温。它意味着一半时间内感热输送是从大气输向地面,感热的净输送为零。
这个结果表明震前低层大气加热非常不同于传统方式(热传导、涡流扩散),它似乎与地气污染有关,是震前地下所逸放出来。

Abstract:

This paper deals with the cause-of heat increase in the lower atmosphere in Hai-Cheng region prior to the earthpuake.
By means of the temperature tendency equation, each item of heating factors has been Considered. The vertical velocity item's (convection item) value was -8.6℃/day, -3.8℃/day, on 3rd and Feb, respectively in the 1000rob to 970mb level, The radiation item's value was 3.9℃/day, 3.3℃/day on 3rd and 4th Feb. respectively, The horizotal transport item's value was 0.43/day, -0.8℃/day on 3rd and 4th. Feb. respectively. The latent heat item's value was Very small. The Sensible heat value (flux of sensible heat at atmosphere bottom), was calculated from the temperature tendency equation inversely; it seemed to be 7.4℃/day, 3.8℃/day on 3rd and 4th respectively. But the odeservations of the mean air temperture at 1.5m height in Hai-Cheng region showed that it appeared above the average ground temperature during the half period of lst-4th. Feb. It hinted that during the half period the sensible heat was transported from atmosphere to t-he ground. The net sensible heat transport was near zeros.
The result shows that the heating mode of the lower atmosphere prior to the earthquake is Very different from traditional heating (conduct, eddy transport) It may be concerned with the pollution of gases which overflowed out of ground prior to the earthquake.