Frontal Characteristics With help of: –Equivalent Thickness and –Thermal Front Parameter (TFP)
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Transcript of Frontal Characteristics With help of: –Equivalent Thickness and –Thermal Front Parameter (TFP)
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Frontal Characteristics
• With help of:– Equivalent Thickness and – Thermal Front Parameter (TFP)
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Thermal Front Parameters TFP
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Zones of high thickness gradient
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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
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frontunstable
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front
CA
CA
WA
frontal cloud
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front
Frontal cloud
conv
convdiv
div
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front
frontal cloud
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Analyses on Isentropic Surfaces
Relative Streams and
Conveyor Belts
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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
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frontal cloud pre-frontalCb
selectionof indicativeisentrops:
front
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