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Long-range transport of ozone from the Los Angeles Basin: A case study. A.O. Langford 1 , C. J. Senff 2 , R.J Alvarez 1 II, R. M. Banta 1 , R.M. Hardesty 1 1 Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA - PowerPoint PPT Presentation
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Long-range transport of ozone from the Los Angeles Basin:
A case study
A.O. Langford1, C. J. Senff2, R.J Alvarez1 II, R. M. Banta1, R.M. Hardesty1
1Chemical Sciences Division, Earth System Research Laboratory,
NOAA, Boulder, Colorado, USA
2Cooperative Institute for Research in Environmental Sciences,
University of Colorado, Boulder, and Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA
Pre-CalNex flights coincided with highest ozone in SCAB
during all of 2009
27 of 31 days in July exceeded NAAQS in South Coast Air Basin
2009 High ozone episode15 July: 1-hr 116 ppbv 8-hr 100 ppbv
2009 High ozone episode16 July: 1-hr 124 ppbv 8-hr 90 ppbv
2009 High ozone episode17 July: 1-hr 149 ppbv 8-hr 111 ppbv
2009 High ozone episode18 July: 1-hr 150 ppbv 8-hr 128 ppbv*
* 2009 high value
2009 High ozone episode19 July: 1-hr 146 ppbv 8-hr 110 ppbv
2009 High ozone episode20 July: 1-hr 115 ppbv 8-hr 83 ppbv
San Gabriel Mountains from Pomona CA (1910)
Twin Otter over San Gabriel Mountains on 17 July 2009
Flight track 17 July 2009
TOPAZ Aerosol 17 July
TOPAZ Ozone 17 July
TOPAZ Ozone 17 July
Fontana
San Gabriel Mountains
Glendora
Chino Hills
Santa Ana MountainsCosta Mesa
TOPAZ Ozone 17 July 2009
4
3
2
1
0
120100806040200
Distance (km)
(b)
UCLA SMOG Model 27 Aug 1987 SCAQSLu and Turco 1996
4
3
2
1
0
120100806040200
Distance (km)
(a)
UCLA SMOG ModelLu, Turco, and Jacobson 1994-1996
Integrated model with:• Mesoscale meteorology• Boundary layer physics• Tracer advection• Convection and diffusion• Photochemistry• Aerosol microphysics and chemistry• Solar and terrestrial radiative transfer
UCLA SMOG ModelLu, Turco, and Jacobson 1994-1996
• 85 x 55 grid cell meteorological domain• 51 x 31 grid cell tracer chemistry domain • Horizontal resolution ~0.05° (~5 km)• 20 non-uniform vertical layers
Synoptic Background
00 UT 18 July 200944
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
44
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
1000 hPa 1000 hPa
m ASL
00 UT 27 August 1987
1000 hPa
Synoptic Background
44
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
700 hPa 700 hPa
m ASL
00 UT 18 July 2009 00 UT 27 August 1987
700 hPa
Where does the ozone go?48 h HYSPLIT forward trajectories
44
42
40
38
36
34
32
-125 -120 -115 -110 -105Longitude (°E)
2000 m 3000 m 4000 m
DV
GB
CL
GCMV
GH
(a)
Where does the ozone go?48 h HYSPLIT forward trajectories
6
4
2
0
00:007/18
12:00 00:007/19
12:00 00:007/20
UT
2000 3000 4000
Where does the ozone go?48 h HYSPLIT forward trajectories
70
65
60
55
50
45
40
35
7/15 7/17 7/19 7/21
UT
GB
24 hours later
Where does the ozone go?48 h HYSPLIT forward trajectories
70
65
60
55
50
45
40
35
7/15 7/17 7/19 7/21
UT
MV CL
48 hours later
Where does the ozone go?48 h HYSPLIT backward trajectories
44
42
40
38
36
34
32
-125 -120 -115 -110 -105Longitude (°E)
CL
21 20 19 18 17 16 15
Where does the ozone go?48 h HYSPLIT forward trajectories
6
4
2
0
7/15 7/17 7/19 7/21
UT
How often does this occur?
What about 19 July 2009
Flight track 19 July 2009
TOPAZ Aerosol 19 July
TOPAZ Ozone 19 July
Synoptic Background
00 UT 18 July 2009 00 UT 20 July 200944
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
44
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
1000 hPa 1000 hPa
m ASL
00 UT 090720 1000 hPa
1000 hPa
Synoptic Background
00 UT 18 July 2009 00 UT 20 July 200944
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
44
42
40
38
36
34
32
30
-125 -120 -115 -110 -105
Longitude
700 hPa 700 hPa
m ASL
700 hPa
700 hPa
Questions for CalNex
• What conditions are needed for “Mountain Chimney Effect”?
• What conditions favor long range transport from the Los Angeles Basin?
• How well can WRF/Chem reproduce these observations?