Transcript State_Climatologist_Report_June_2009.ppt

Observed Diurnal-Seasonal and
Longer Scale Variation of
Sulfur Dioxide in Maryland
Partly supported by NASA
Progress Report to MDE
June 12, 2009
Dr. Konstantin Vinnikov, Acting State Climatologist for Maryland
Prof. Russell Dickerson, Department of Atmospheric and Oceanic Science
University of Maryland at College Park, MD
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TASK:
Study Temporal and Spatial Variability of
SULFUR DIOXIDE in Atmospheric Air Using
Multi-year Observations at Surface Stations at
Maryland and its Vicinity.
GOAL:
Define Temporal and Scale Requirements for
Geostationary Satellite Monitoring of Air
Pollutants & Evaluate/Validate CMAQ model.
DATA:
1. National Parks
2. MDE-run stations
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YEAR 2002 DATA
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STATIONS MAP
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SHENANDOAH NATIONAL PARK:
•This station is ~1 km above sea level.
•No local SO2 emissions.
•Very weak diurnal cycle.
•Noticeable seasonal cycle
Altitude = 1073 m above MSL
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VINTON, VA
BLUE RIDGE PWY:
•Altitude ~350 m
•No local emissions
•Weak diurnal cycle.
•Noticeable seasonal
cycle.
ALEXANDRIA, VA
Altitude = 346 m MSL
G. Wash. Mem. Pwy:
•Traffic emissions.
•Well pronounced
diurnal and seasonal
Altitude = 23 m MSL
cycles in SO2.
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BELTSVILLE, MD:
•Suburban
environment.
•Traffic emissions.
•Well pronounced
seasonal and
diurnal cycles in
SO2.
PINEY RUN, MD:
•Altitude is 777 m.
Altitude = 49 m MSL
•Strong seasonal
cycle.
•Strong diurnal
cycle in SO2
without known
sources of local
emissions.
Altitude = 777 m MSL
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Long-term changes in seasonal and diurnal cycles of SO2
<SO2>=9.8 ppb
<SO2>=7.2 ppb
<SO2>=6.3 ppb
Altitude = 5 m MSL
<SO2>=4.4 ppb
<SO2>=7.2 ppb
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Conclusions:
•Seasonal cycle of SO2 with late winter (reduced loss
rates due to H2O2 and OH) maximum always exists in
surface data at MD and its vicinity.
•Diurnal cycle of SO2 depends on diurnal cycle of local
pollutants and on diurnal evolution of boundary layer.
•High elevated monitoring stations at National Parks do
not display noticeable diurnal cycle in SO2.
•Unexpected well pronounced diurnal cycle in
observation of Piney Run, MD station is a mystery!
•These estimates will be used for model validation.
The work is in progress. Seasonal and diurnal
cycles of CO and PM2.5 and other pollutants are going to
be studied next.
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