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发表于 2015-1-18 18:46:52
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Pseudo-equivalent potential temperature (cont'd)
ep=T p0
pd Rd /C pd
H−r Rv /C pd exp Lr
C pdT exp−
Cl
C pd
∫T *
T
r d lnT '
ep is conserved for adiabatic transform up to the LCL followed by a pseudo-adiabatic.
ep is function de T , pd , r for unsaturated air and is only function of T and pd for
saturated air.
In practice, except in very moist tropical regions, epdiffers weakly frome
and can be used also in reversible transforms for which liquid water is transported
with the parcel.
Practical approximative formula ep (Bolton, 1980)
ep=T 1000
p 0,28541- 0,28r
exp[r 10,81r 3376
T *
−2,54]
This expression is accurate up to 0.3K within the range of atmospheric conditions.
附件62页有假相当位温的解释;56页有相当位温的解释;应该不是一个概念;注明:附件是网上找到的,不是本人的东西; |
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