SURFACE LAYER

Сентябрь 3, 2022

Содержание

2. Some characteristics of the surface layer Surface layer (SL) is greatly influenced by the underlying surface.
3. For more clear reasoning, let’s assume the following conditions: no advection vertical motion close to zero
4. Let’s define the altitude z=h, up to which the ratio remains very small. For instance ε=0,1
5. From the previous discussion we know The layer 0 – Z is relatively small. Therefore, within
6. Temperature profiles in the surface layer the New Bridge, Bratislava, Slovakia; Temperature inversion; 11 Nov 2005
7. eddy coefficient k grows up with z in the surface layer assume there’s linear growth of
8. Let’s multiply both parts of (13.4) by dz
9. Let’s integrate (13.6) from z=0 ( ) to arbitrary chosen z we adopted that (13.7) is
10. (13.7) can be rewritten as T0 is measured just at the surface (significant inaccuracy). Let’s reduce
11. sign of temperature variation with height depends on sign of heat flux Q0 the air temperature
12. Some empirical studies have shown that logarithmic law describes T(z) more or less correctly at neutral
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Слайд 2

Some characteristics of the surface layer
Surface layer (SL) is greatly influenced

by the underlying surface. The latter supplies the SL with heat, water vapor, and admixtures and here the air currents experience the friction effect.
Meteorological parameters experience variations with time and altitude that are much stronger than in the rest of the atmosphere.
Inversions are frequent phenomena in the surface layer.
The most important process in the surface layer is EDDY MIXING.

Слайд 3

For more clear reasoning, let’s assume the following conditions:
no advection
vertical

motion close to zero
εr=0, fair weather (no water phase transfer)

Слайд 4

Let’s define the altitude z=h, up to which the ratio remains

very small.

For instance ε=0,1

“h” is altitude of SL

According to measurements, Q0=40…250 w/m².

Suppose, temperature variation is 5°C for 12 hours

Слайд 5

From the previous discussion we know
The layer 0 – Z is

relatively small. Therefore, within this layer temperature variation has the same sign at any altitude. It means that Z increase results in increase the integral too, and at Z

Thus, within the layer 0 – h Q≈Q0. The error will not be more than 10%

Слайд 6