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Improvement of Field Calibration of a Transmissometer for Visibility Measurement  

Kim Kyung W. (Department of Environmental Science and Engineering, Gyeongju University)
Kim Young J. (Advanced Environmental Monitoring Research Center(ADEMRC) Department of Environmental Science & Engineering, Gwangju Institute of Science and Technology(GIST))
Publication Information
Journal of Korean Society for Atmospheric Environment / v.21, no.E2, 2005 , pp. 49-56 More about this Journal
Abstract
A long-path transmissometer is one of the optical instruments widely used to measure atmospheric light extinction coefficient without enclosing a light beam and perturbing aerosols. Over the past two decades, a number of measurements have been carried out using the long-path transmissometer manufactured by OPTEC, Inc. Calibration of the transmissometer should be performed when any component of the transmissometer system is interchanged or installation condition is changed. For a better calibration of the transmissometer, application of a modified calibration method for the existing neutral density (ND)-filter method was recommended for the computation of the atmospheric transmittance using model MODTRAN 4 in this study. It was revealed that the measured light extinction coefficient from the transmissometer which was calibrated using the existing ND-filter method could be overestimated due to the assumption of the atmospheric transmittance suggested by OPTEC, Inc. The uncertainty of the measured light extinction coefficient from the transmissometer calibrated based on the modified ND-filter method was calculated to be approximately $13Mm^{-1}$.
Keywords
Visibility; Transmissometer; Light extinction; Calibration;
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  • Reference
1 Malm, W.C. and G. Persha (1991) Considerations in the Accuracy of a Long-Path Transmissometer, Aerosol Science and Technology, 14, 459-471   DOI   ScienceOn
2 Sobeman, R.K. and C.L. Hemenway (1965) Metroric Dust in the Upper Atmosphere, J. Geophys. Res., 70, 4943 -4949   DOI
3 Tombach, I. and D. Allard (1983) Comparison of Visibility Measurement Techniques: Eastern United States, Report EPRI EA-3292, Electric Power Research Institute, Palo Alto, CA
4 Shettle, E.P., V.D. Turner, and L.W. Abreu (1983) Angular Scattering Properties of the Atmospheric Aerosols, Fifth Conference on Atmospheric Radiation, Oct. 31-Nov. 4, Baltimore, MD, A.M.S
5 Ghim, Y.S., K.C. Moon, S. Lee, and Y.P. Kim (2005) Visibility Trends in Korea during the Past Two Decades, J. Air & Waste Manage. Assoc., 55, 73-82   DOI   ScienceOn
6 Gebhart, K.A., S. Copel, and W.C. Malm (2001) Diurnal and Seasonal Patterns in Light Scattering, Extinction, and Relative Humidity, Atmos. Environ., 35(30), 5177-5191   DOI   ScienceOn
7 Baik, N.J., Y.P. Kim, and K.C. Moon (1996) Visibility Study in Seoul, 1993. Atmos. Environ., 30, 23 19-2328   DOI   ScienceOn
8 Kim, K.W., Z. He, and Y.J. Kim (2004) Physico- Chemical Characteristics and Radiative Properties of Asian Dust Particles Observed at Kwangju, Korea during the 2001 ACE-Asia IOP, J. Geophys. Res., 109, D19, D19S02   DOI
9 Molenar, J.V., G. Persha, and W.C. Malln (1989) Long-Path Transmissometer for Measuring Ambient Atmospheric extinction, AWMA Visibility Specialty Conference, Estes Park, Colorado, October   DOI
10 IMPROVE (1998) Spatial and Temporal Pattern and the Chemical Composition of the Haze in the United States, 4-1-4-9
11 Kneizys, F.X., E.P. Shettle, L.W. Abreu, J.H. Chetwynd, G.P. Anderson, W.O. Gallery, J.E.A. Selby, and S.A. Clough (1988) Users Guide to LOWTRAN 7, AFGL-TR-88-0177, (NTIS AD A206773)
12 Malm, W.C. and J.V. Molenar (1984) Visibility Measurements in National Parks in the Western United States, J. APCA, 34,899-904   DOI   ScienceOn
13 Berk, A,, L.S. Bernstein, and D.C. Robertson (1989) MODTRAN: A Moderate Resolution Model for LOWTRAN 7, Final Report GL-TR-89-0122, Hanscom AFB, MA
14 Ruby, M.G. (1985) Visibility Measurement Methods: I. Integrating Nephelometer, J. APCA, 35, 244-248   DOI   ScienceOn
15 Clough, S.A., M.J. Iacono, and J.L. Moncet (1992) Lineby- line Calculations of Atmospheric Fluxes and Cooling Rates: Application to Water Vapor, J. Geophys. Res., 97, 15761-15774   DOI
16 Kim, K.W., Y.J. Kim, and S.J. Oh (2001) Visibility impairment during Yellow Sand periods in the urban atmosphere of Kwangju, Korea, Atmos. Environ. 35(30), 5157-5167   DOI   ScienceOn
17 OPTEC, Inc. (2004) Technical manual for theory of operation and operation procedures for model LPV-2 transmissometer (is available on the website, www.optecinc.com)
18 Dzubay, T.G., R.K. Stevens, C.W. Lewis, D.H. Hern, W.J. Courtney, J.W. Tesch, and M.A. Mason (1982) Visibility and aerosol composition in Houston, Texas, Environ. Sci. Technol. 16, 514-525   DOI   ScienceOn
19 Air Resource Specialists Inc. (1988) OPTEC, Inc. LPV-2 Transmissometer Instrument and Standard Operating Procedures Manual, ARS, Ft. Collins, CO
20 Mathai, C.V. (1995) The Grand Canyon Visibility Transport Commission and Visibility Protection in Class I Areas, EM, 1(12), 20-31
21 Hidas, M.G., M.G. Burton, M.A. Chamberlain, and J.W.V. Storey (2000) Infrared and Sub-millimetre Observing Conditions on the Antarctic Plateau, PASA, 17(3), 260-272   DOI