As shown in Figure 2, the average PM2.5 mass
concentration measured at SAMA1 during 2002 to 2004 is 9.2
µg/m3. The average total light extinction coefficient (Bext) is 82.4 Mm-1
(Visual Range ~ 58 Km; Deciview ~ 20). The average contributions of the
major aerosol components to St. Marks haze are particulate sulfate 58.7%,
coarse mass (CM) 3.0%, organic matter (OMC) 14.5%, elemental carbon (light
absorbing carbon, LAC) 4.2%, fine soil 0.8%, sea salt 0.7%, and nitrate 4.7%.
Figure 2. Average
contributions of major aerosol chemical components to light extinction
(Based on data available in 2000-2002)
Figure 3. Percentage of
sampling days that are 20% worst days in each month (Based on data available
in 2000-2002)
Figure 4. Average
contributions of major aerosol chemical components to light extinction
during 20% worst days in each month (Based on data available in 2000-2002)
For a detailed examination of
the aerosol characteristics at St. Marks consult the
aerosol description web page.
