Difference between revisions of "Convective adjustment"

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<div class="definition"><div class="short_definition">A method of representing unresolved [[convection]] in atmospheric models  by imposing large-scale vertical profiles when convection occurs.</div><br/> <div class="paragraph">As originally developed, convective adjustment was applied when modeled lapse rates became  [[adiabatically]] unstable. New temperatures were calculated for unstable layers by conserving [[static  energy]] and imposing an [[adiabatic lapse rate]]. If, in addition, humidities exceeded [[saturation]],  they were adjusted to saturation, with excess water removed as [[precipitation]]. A related adjustment,  (stable saturated adjustment), for stable layers with [[water vapor]] exceeding saturation, returned  them to saturation, also conserving [[energy]]. More recently, convective adjustments have been  developed that adjust to empirically based lapse rates, rather than [[adiabatic lapse rates]], while still  maintaining energy conservation. Convective adjustment is generally applied to [[temperature]] and  [[humidity]] but, in principle, can also be applied to other fields affected by convection.</div><br/> </div>
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<div class="definition"><div class="short_definition">A method of representing unresolved [[convection]] in atmospheric models  by imposing large-scale vertical profiles when convection occurs.</div><br/> <div class="paragraph">As originally developed, convective adjustment was applied when modeled lapse rates became  [[adiabatic process|adiabatically]] unstable. New temperatures were calculated for unstable layers by conserving [[static energy|static  energy]] and imposing an [[adiabatic lapse rate]]. If, in addition, humidities exceeded [[saturation]],  they were adjusted to saturation, with excess water removed as [[precipitation]]. A related adjustment,  (stable saturated adjustment), for stable layers with [[water vapor]] exceeding saturation, returned  them to saturation, also conserving [[energy]]. More recently, convective adjustments have been  developed that adjust to empirically based lapse rates, rather than [[adiabatic lapse rates]], while still  maintaining energy conservation. Convective adjustment is generally applied to [[temperature]] and  [[humidity]] but, in principle, can also be applied to other fields affected by convection.</div><br/> </div>
 
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Latest revision as of 15:42, 25 April 2012



convective adjustment

A method of representing unresolved convection in atmospheric models by imposing large-scale vertical profiles when convection occurs.

As originally developed, convective adjustment was applied when modeled lapse rates became adiabatically unstable. New temperatures were calculated for unstable layers by conserving static energy and imposing an adiabatic lapse rate. If, in addition, humidities exceeded saturation, they were adjusted to saturation, with excess water removed as precipitation. A related adjustment, (stable saturated adjustment), for stable layers with water vapor exceeding saturation, returned them to saturation, also conserving energy. More recently, convective adjustments have been developed that adjust to empirically based lapse rates, rather than adiabatic lapse rates, while still maintaining energy conservation. Convective adjustment is generally applied to temperature and humidity but, in principle, can also be applied to other fields affected by convection.


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