用气象站地温资料计算多年平均土壤热流的初步结果

PRELIMINARY RESULTS OF MEAN SOIL HEAT FLUX CALCULATED BY SOIL TEMPERATURE DATA OBSERVED AT METEOROLOGICAL STATIONS

According to linear heat conduction theory in half limitedless space, the soil temperature data at the depths of 0.8 m and 3.2 m observed at meteorological stations from 1954 to 1989, have been used for calculating soil heat flux. Preliminary results are that: (a) If soil temperature data observed at meteorological stations are more than 11 years, they can be used for calculating the average of soil heat flux (also can be called earth surface layer heat flux) after filter analysis. (b) Both methods given in this paper and in Wang's(Wang, 1990) are the same precise for calculating thermal conductivity. (c) The soil temperature data observed in Beijing station have been analyzed, for example, which demonstrated that there exist good corresponding relationships among the soil temperature gradient, annual precipitation and earthquake.(d) Both the directions and the orders of magnitude of the heat flow at the earth surface layer and that at the deep are the same in the most of calculated area. And in the area where there are two kinds of heat flows mentioned above, their distribution patterns are accordance to each other.(e) The heat flows at the surface layer is contrary to that at the deep in desert, this means that there is a " heat sink layer" at the adequate depth under the desert, (f) There is a great similarity between the locations of high bands of soil heat flux and the earthquake bands in China.