Fine Scale Meteorology & Air Quality Models - School of Architecture ...

ASI2_Lecture 3_7/12/2011
Impact of UCPs on Mesoscale modeling:
Mixing height and wind vectors at 50 m AGL
a) the standard version of MM5 using G-S PBL
b) GS PBL including UCP w/BouLac
a)
Mixing Height at 6 p.m.
b)
Mixing Height at 6 p.m.
X
100
80
60
40
20
0
0 20 40 60 80 100
Y
(in meter)
2000
1800
1600
1400
1200
1000
800
600
X
100
80
60
40
20
5m.s -1 0
0 20 40 60 80 100
Y
(in meter)
2000
1800
1600
1400
1200
1000
800
600
5m.s -1
ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011
Impact of UCPs on
Mesoscale modeling
Difference fields
(UCP- noUCP) MM5 simulations
LHS: mixing height
RHS: air temperature, wind
vectors @50 m AGL
X
X
X
a) 6a.m.
100
b) 2p.m.
100
c) 6p.m.
100
0
0 20 40 60 80 100
Y
0
0 20 40 60 80 100
Y
0
0 20 40 60 80 100
Y
ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011
80
60
40
20
80
60
40
20
80
60
40
20
(in meter)
250
200
150
100
50
0
-50
-100
-150
-200
-250
(in meter)
250
200
150
100
50
0
-50
-100
-150
-200
-250
(in meter)
250
200
150
100
50
0
-50
-100
-150
-200
-250
X
X
X
100
80
60
40
20
100
80
60
40
20
100
0
0 20 40 60 80 100
Y
0
0 20 40 60 80 100
Y
80
60
40
20
6a.m.
2p.m.
6p.m.
0
0 20 40 60 80 100
Y
(in K)
4
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
0.2 m.s -1
(in K)
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.2 m.s -1
(in K)
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.2 m.s -1
8