Skew T-log P diagram

Wet adiabatic lapse rates can be determined from Fig. 4-7, which is a skew T-log P diagram (or adiabatic chart). On this chart, dry adiabats are lines having a nearly constant slope of 9.8°C/1000 m (5.4°F/1000 ft). The wet adiabats are curved and have slopes that not only vary with the temperature at which the adiabat originates but also change along the length of the adiabats. Note that the wet adiabats tend to approach the slope of the dry adiabats at low temperatures, where the absolute amount of moisture in saturated air is small (see Table 4-3). 

FIGURE 4-7 The skew T-log P diagram, or adiabatic chart. On this chart all lines of temperature versus altitude for dry conditions (i.e., no condensation of water vapor) are nearly straight lines with a slope corresponding to the dry adiabatic lapse rate of 9.8°C/1000 m (5.4°F/1000 ft). These are called dry adiabats and slope upward to the left. Wet adiabats have a variable slope and appear as curved lines. Horizontal lines denote altitude lines of constant temperature slope upward to the right. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

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