Long − Range Transport of Asian Sulfate and Its Effects on the Canadian Sulfate Burden Aaron van...
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Transcript of Long − Range Transport of Asian Sulfate and Its Effects on the Canadian Sulfate Burden Aaron van...
Long−Range Transport of Asian Sulfate and Its Effects on the Canadian Sulfate Burden
Aaron van Donkelaar, Randall V. Martin – Dalhousie University W. Richard Leaitch, Anne Marie Macdonald – Environment Canada
Thomas W. Walker – University of TorontoDavid G. Streets, Qiang Zhang – Argonne National Laboratory
Edward Dunlea, Jose L. Jimenez – University of ColoradoJack E. Dibb – University of New Hampshire
Greg Huey, Rodney Weber – Georgia Institute of TechnologyMeinrat O. Andreae – Max Plank Institute for Chemistry
AGU Fall Meeting 2007December, 14th, 2007
INTEX−B
• Intercontinental Chemical Transport Experiment Phase B• NASA driven campaign• April-May 2006
• Sulfate enhancement in free troposphere
• Organic enhancement in boundary layer
• Sulfate mass scaled by 1.4 to compensate for size restrictions
Trans−Pacific sulfate observed at Whistler?
600
700
800
900
Alti
tude
[k
m]
Pressure
[hPa]
Aerosol Concentration [µg/m3]
0 3 6
H2O Concentration [g H2O/kg]
0 1 2 3
4
3
2
1
SO4=
Org
NH3
Sulfate contributes to East Asian AODModel (GEOS-Chem) MODIS MISR
MODISMISRAllDust ModelSO4
=
Model held at 2000 anthropogenic emissions
Fall AOD trend reflects SOx emissions
6.2 – 9.6% emission
growth per year
MODISMISRAllDust ModelSO4
=
Model held at 2000 anthropogenic emissions
Asian sulfate dominates INTEX−B sulfate
• Filter Pack 25% higher than unscaled Mist Chamber
• C130 and Cessna measurements scaled by 1.4
AircraftFull EmissionsNo East Asia ModelNo Anthro.
Significant growth to East Asian contribution
• 2.4-3.4x increase in simulated East Asian contribution since 1985
AircraftFull EmissionsNo East Asia ModelNo Anthro.
Long−range transport affects NA sulfate burden
• April-May 2006• Persistent East Asian
contribution at 4 km• Near Vancouver:
– 25-30% of surface sulfate of east Asian origin
– 40% of sulfate burden (1-5 km) of east Asian origin
Alti
tude
[k
m]
SO
4= a
t 2.0
km
Alti
tude
[k
m]
% A
sian
S
O4=
SO
4=
[µg/
m3]
Long−range transport degrades surface air quality
• Mean surface conditions well correlated with simulated East Asian influence during April-May 2006
• Mean increase of 0.38 µg/m3 per +10% Asian influence
% Asian (simulated)
Mea
sure
d S
O4=
[µg/
m3]
Conclusions
• 6.2-9.6% annual mean increase in anthropogenic East Asian SOx emissions since 2000
• 2.4-3.4x increase in the relative contribution of East Asian sulfate since 1985
• Anthropogenic East Asian sulfate degrades NA surface air quality