Fine Scale Meteorology & Air Quality Models - School of Architecture ...
Fine Scale Meteorology & Air Quality Models - School of Architecture ...
Fine Scale Meteorology & Air Quality Models - School of Architecture ...
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ASI2_Lecture 3_7/12/2011<br />
Suggested parameterization<br />
u u <br />
u u K<br />
<br />
i j 2<br />
Best option would be to treat <br />
<br />
i j<br />
ijtke<br />
x<br />
j<br />
x <br />
<br />
<br />
i <br />
3<br />
As first step, Martilli assumed<br />
ui<br />
u<br />
iuj<br />
K<br />
Relatively easy to implement in WRF….<br />
x<br />
j<br />
For “ K” Martilli invoked the Bougeault and Lacarrere scheme, so<br />
the vertical diffusion coefficient becomes<br />
K<br />
z<br />
<br />
cl<br />
boulac<br />
tke<br />
By analogy, in the horizontal<br />
K c maxl<br />
, x tke<br />
x<br />
boulac<br />
<br />
z<br />
zdz<br />
tkez<br />
<br />
down<br />
<br />
z<br />
zdz<br />
tkez<br />
<br />
z o<br />
1/<br />
2<br />
l<br />
upldown<br />
<br />
minl<br />
,l <br />
ASI 2: URBAN CLIMATE AND AIR POLLUTION <strong>School</strong> <strong>of</strong> <strong>Architecture</strong>, The Chinese University <strong>of</strong> Hong Kong, Hong Kong, 7-8 Dec 2011<br />
z<br />
<br />
zlup<br />
z<br />
zl<br />
l<br />
l<br />
<br />
boulac<br />
g<br />
o<br />
g<br />
up<br />
down<br />
l up and l down are the distances that a parcel<br />
originating from level z, and having the<br />
TKE <strong>of</strong> level z, can travel upward and<br />
downward before coming to rest due to<br />
buoyancy effects.<br />
Application <strong>of</strong> Filter Option<br />
Base<br />
New<br />
23
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