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High Tropospheric Divergence in Developing Lows |
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Click here to Order your Radar Equipment Online High Tropospheric Divergence in Developing LowsIn the case of developing (dynamic) cyclones, horizontal divergence is at a maximum in the 400- to 200-hPa stratum, and the air above must sink and warm adiabatically to maintain equilibrium. See figure 3-8.
Figure 3-8.-Vertical circulation over developing low. Using the Current 500-hPa Chart In the deepening of lows there must be removal of air at high levels due to divergence in the 400- to 200-hPa stratum, resulting in stratospheric warming. Insufficient inflow at very high levels to compensate the subsidence results in 500-hPa contour falls. This is roughly the mechanism thought to be responsible for the development of low-pressure systems. The high-level decrease in mass overcompensates the low tropospheric increase in density; the high-level effect thus determines the reduction of pressure at the surface when lows are intensifying. This information is now available on CD in Adobe PDF Printable Format |
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