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 />
ACM-2<br />
BouLac<br />
QNSE<br />
TKE-NO<br />
TKE-YES<br />
TKE-YES<br />
YSU<br />
TKE-NO<br />
Results Sensitive<br />
to PBL schemes<br />
TERRA: Pixel Size 500m<br />
Aug 4 2006 @ 17:20UTC<br />
Simulations @ 20:00 UTC<br />
MYJ<br />
MYNN2<br />
MYNN3<br />
TKE-YES<br />
TKE-<br />
TKE-<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 />
Grid size dependent results<br />
4km(upper) vs 1 km Base (lower)<br />
Heat Flux Latent Heat PBL height Ustar<br />
<strong>Fine</strong> scale structures are unresolved at 4 km, even though features are <strong>of</strong> that order. Resolution becoming<br />
apparent for grids at 1km (or less). From Rampanelli et al., (2004), with 1km grids, shallow circulations can<br />
appear due to convective instability (superadiabatic layer) at the minimum resolved scale (4dx). At the<br />
coarser horizontal grids typical <strong>of</strong> mesoscale models, such circulations would grow too slowly to be noticed.<br />
Hence at 1km the simulations are in a resolution regime where turbulence cannot be explicitly resolved, yet<br />
the superadiabatic ASI 2: URBAN CLIMATE layer can AND induce AIR POLLUTION circulations that <strong>School</strong> grow <strong>of</strong> <strong>Architecture</strong>, to noticeable The Chinese University size over <strong>of</strong> Hong the Kong, integration Hong Kong, 7-8 Dec period. 2011<br />
19
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