IMPROVE Optical data During the Asian Dust Storm 2001: First Look Bret Schichtel NPS/CIRANPS/CIRA, Fort Collins, CO

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Presentation transcript:

IMPROVE Optical data During the Asian Dust Storm 2001: First Look Bret Schichtel NPS/CIRANPS/CIRA, Fort Collins, CO

Optical Monitoring Network ARS deploys a number of transmissometers and nephelometers to measure light extinction and scattering, respectively, at Class I areas for the IMPROVE program and urban and rural areas for regulatory agencies.ARSIMPROVE ARS provide the Level 1 QA’ed data for this first look at the impact of the Asian dust on the optical environment.

Light Extinction Measurement April 8-18 Between April there was low RH and the Bext was 2-4 times the Bext from the preceding week.

Light Extinction and Scattering During Dust Event Nephelometers underestimate coarse particle scattering by as much as 50% due to truncation of the forward scattering lobe. The large difference between the Transmissometer, Bext and Nephelometer, Bsp along with the low RH is a good indication that the Asian dust is present.