frontal characteristics with help of: –equivalent thickness and –thermal front parameter (tfp)
Post on 21-Dec-2015
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Frontal Characteristics
• With help of:– Equivalent Thickness and – Thermal Front Parameter (TFP)
Thermal Front Parameters TFP
Zones of high thickness gradient
Use of Vertical Cross Sections
• Important view in third dimension• Reveals additional information• Parameters most indicative:
– Isentrops (constant potential temp, dry [ =T(1000/p) R/cp ], and wet)
– Humidity and humidity advection– Divergence and vertical motion – Temperature advection– Vorticity and vorticity advection – Potential vorticity– Isotachs
frontunstable
front
CA
CA
WA
frontal cloud
front
Frontal cloud
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frontal cloud
Analyses on Isentropic Surfaces
Relative Streams and
Conveyor Belts
Relative Streams Approach
• Streams are on isentropic surfaces:
• Surface of constant potential/equivalent potential temperature = T (1000/p) exp (R/cp) e = exp (r qm/ cp T)
• Streams are relativ to a system velocity– Determination of system velocity from AMVs
frontal cloud pre-frontalCb
selectionof indicativeisentrops:
front