HALE1 (Haleakala National Park, HI, Lat. 20.8086, Long. -156.2823, Alt. 1157.9) Print-Friendly Version Print-Friendly Version (B&W)
2 year and 2 month aerosol data are available in Haleakala National Park during the sampling period of 1997 - 2002. As shown in Figure 1, the overall average total light extinction coefficient (Bext) is 25.2 Mm-1 (Visual Range ~ 155 Km; Deciview ~ 9.2). The average PM2.5 mass concentration is 2.6 mg/m3. The average contributions of the major aerosol components to Haleakala National Park haze are particulate sulfate 32.7%, nitrate 8.0%, organic matter (OMC) 7.0%, elemental carbon (light absorbing carbon, LAC) 3.1%, fine soil 1.0% and coarse mass (CM) 8.4%.
Figure 1 Average contributions of major aerosol chemical components to light extinction (Based on data available in 1997-2002) (B&W)
Figure 2 Average contributions of major aerosol chemical components to light extinction in 20% best, middle 60% and 20% worst days (Based on data available in 1997-2002) (Data Table) (B&W)
As Figure 2 indicates, the average aerosol light extinction coefficient (Bext – Rayleigh Scattering (10 Mm-1)) during the 20% worst days is 28.0 Mm-1, which is about 5.2 times of the value of 5.4 Mm-1 during the 20% best days and 2.0 times of the value of 13.9 Mm-1 during the middle 60% days. Sulfate is the largest contributor to aerosol light extinction during the 20% worst days, and the contribution of sulfate to aerosol light extinction is ~ 64.1% in the 20% worst days.
Figure 3 suggests that the highest occurrence of the 20% worst days happened in March to May, in which ~30 - 40% of the sampling days are the 20% haziest days at Haleakala National Park. As shown in Figure 4, sulfate is the largest aerosol contributor to haze the whole year, with a contribution of ~ 30 - 60% in the worst days.
Figure 3 Percentage of sampling days that are 20% worst days in each month (Based on data available in 1997-2002) (Data Table) (B&W)
Figure 4 Average contributions of major aerosol chemical components to light extinction during 20% worst days in each month (Based on data available in 1997-2002) (Data Table) (B&W)
