Abstract
The atmospheric budgets of mass, heat and moisture are analysed for the first phase (February 14-28, 1974) of the Air-Mass Transformation Experiment (AMTEX). The analysed period is subdivided into three parts according to different synoptic situations. During the period in which a warm air enters the AMTEX area from the subtropicalregion, a strong inversion lies near 800mb and there is a downward motion with a maximum value near the inversion. An apparent heat sink and a moisture source of the large-scale motion system are found near the inversion base and total heat transports by subgrid-scale
eddies are almost confined below the inversion base. The value of the total heat supply from the sea surface is estimated to be 400ly day-1. On the other hand during the period in which a cold-air outbreak occurs, a large amount of total heat energy more than 1, 000 ly day-1 is supplied from the sea surface. A large apparent heat source and a large apparent moisture source are found in the layer between the sea surface and 800mb. During the intermediate period between the previous two periods, the AMTEX area is affected by the traveling cyclones whose centers pass through to the north of the AMTEX area.
Values of the total heat flux calculated by large-scale budgets agree quite well with those estimated independently by bulk aerodynamic computations.
