🗊 Презентация Slice Method

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Слайды и текст этой презентации

Слайд 1


Lecture 10 part 2 1. Particle method (Lect. 8-9): assumption of particle motion within motionless environment. 2. Basic approaches of slice method:...
Описание слайда:
Lecture 10 part 2 1. Particle method (Lect. 8-9): assumption of particle motion within motionless environment. 2. Basic approaches of slice method: 1938-1939 (Bjerknes J.,Petersen S., Shishkin N. )

Слайд 2


Let’s pick out a sufficiently large layer of air
Описание слайда:
Let’s pick out a sufficiently large layer of air

Слайд 3


Slice method assumptions: all variations of the quantities within the picked out layer come out adiabatically; no advection (horizontal mass motion)...
Описание слайда:
Slice method assumptions: all variations of the quantities within the picked out layer come out adiabatically; no advection (horizontal mass motion) is observed; the mass of air above any layer remains unchanged.

Слайд 4


The latter means that fluxes of air mass through section S’ and S’’ are equal:
Описание слайда:
The latter means that fluxes of air mass through section S’ and S’’ are equal:

Слайд 5


To derive the stability criterion:
Описание слайда:
To derive the stability criterion:

Слайд 6


Suppose, particles come from lower level to upper one:
Описание слайда:
Suppose, particles come from lower level to upper one:

Слайд 7


From (10.10)-(10.13) we obtain:
Описание слайда:
From (10.10)-(10.13) we obtain:

Слайд 8


Let’s use (10.9)
Описание слайда:
Let’s use (10.9)

Слайд 9


Let’s consider 3 cases: Updraft and downdraft air isn’t saturated Criteria of stability of both methods (parcel and slice ones) give the same result.
Описание слайда:
Let’s consider 3 cases: Updraft and downdraft air isn’t saturated Criteria of stability of both methods (parcel and slice ones) give the same result.

Слайд 10


2nd case: Updraft and downdraft air fluxes are saturated Criteria of stability of both methods (parcel and slice ones) give the same result.
Описание слайда:
2nd case: Updraft and downdraft air fluxes are saturated Criteria of stability of both methods (parcel and slice ones) give the same result.

Слайд 11


3d case: Updraft air is saturated and downdraft flux is not. Cu clouds development
Описание слайда:
3d case: Updraft air is saturated and downdraft flux is not. Cu clouds development

Слайд 12


From (10.18) and From (10.18) and Stability criteria of both methods are coincide if the stratification is absolutely unstable and absolutely stable....
Описание слайда:
From (10.18) and From (10.18) and Stability criteria of both methods are coincide if the stratification is absolutely unstable and absolutely stable. However, often

Слайд 13


Let’s introduce a critical lapse rate
Описание слайда:
Let’s introduce a critical lapse rate

Слайд 14


at conditionally unstable stratification the atmosphere is unstable for small size particles and it’s stable for LARGE size particles =>>the...
Описание слайда:
at conditionally unstable stratification the atmosphere is unstable for small size particles and it’s stable for LARGE size particles =>>the atmospere is said to be selectively unstable

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