Spectroscopic measurement of horizontal atmospheric extinction and its practical application |
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| Institution: | 1. Environmental Metrology Group, Division of Metrology for Quality Life, Korea Research Institute of Standards and Science (KRISS), 1 Doryong Dong, Yusung Gu, Daejeon 305-600, Republic of Korea;2. Advanced Environmental Monitoring Research Center, Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong Dong, Buk Gu, Gwangju 500-712, Republic of Korea;1. Namik Kemal University, Corlu Engineering Faculty, Environmental Engineering Department, Cerkezkoy Yolu 3. Km, 59860 Corlu-Tekirdag, Turkey;2. European Commission, Joint Research Centre, Institute for Environment and Sustainability, Via E. Fermi 2749, I-21027 Ispra (VA), Italy;1. PRES L''UNAM, Institut Français des Sciences et Technologies des Transports, de l''Aménagement et des Réseaux, Département Géotechnique, Eau et Risques, CS 4, 44344 Bouguenais, France;2. IRSTV (FR CNRS 2488), Nantes, France;3. Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de Cherbourg-Octeville, BP 10, 50130 Cherbourg-Octeville, France;4. LMSPC UMR 7515 CNRS, Université de Strasbourg, 1 rue Blessig, 67084 Strasbourg Cedex, France;1. Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA;2. Institute of Chemical Engineering Sciences, ICEHT/FORTH, Patras, Greece;3. Department of Chemical Engineering, University of Patras, GR 26500, Greece;1. Department of Chemistry, Carleton College, 1 North College Street, Northfield, MN 55057, USA;2. Department of Earth and Atmospheric Sciences, Saint Louis University, O''Neil Hall, 300E, 3642 Lindell Blvd., St. Louis, MO 63108, USA;3. Department of Civil & Environmental Engineering, University of Wisconsin – Madison, 660 North Park Street, Madison, WI 53706, USA;4. Water Science and Engineering Laboratory, University of Wisconsin – Madison, 660 North Park Street, Madison, WI 53706, USA;1. Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, PO box 80005, 3508 TA, The Netherlands;2. Copenhagen Center of Atmospheric Research (CCAR), Department of Chemistry, University of Copenhagen, Denmark;3. Department of Atmospheric Sciences, Institute of Astronomy, University of São Paulo, Brazil;1. Laboratoire de Météorologie Physique, CNRS, Université Blaise Pascal, UMR6016, Aubière cedex, France;2. NASA Langley Research Center, Hampton, VA 23666, USA;3. Institute for Physics of the Atmosphere, Johannes Gutenberg University, Mainz, Germany;4. Centre National de Recherches Météorologiques, URA 1357, Météo-France, Toulouse, France;5. Norwegian Institute for Air Research, Kjeller, Norway;6. Laboratoire des Science du Climat et de l''Environnement, CNRS, France;7. Departement of Atmospheric and Oceanic Sciences, McGill University, Montreal, Canada;8. Laboratoire de Glaciologie et Géophysique de l''Environnement, UMR 5183, Université de Grenoble 1/CNRS, Grenoble, France |
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| Abstract: | At a suburban location in southern Korea, the optical properties of the atmosphere were characterized over a horizontal light path of 1.5 km (in two ways) from 22 October to 19 November 2002. This was achieved by measuring light extinction with a long path differential optical absorption spectrometer system in the ultraviolet and visible wavelength region. The extinction coefficients were obtained relatively as a ratio of a target air spectrum to a defined reference spectrum measured over the same light path (290–760 nm). To assess the measured extinction coefficients, the extinction coefficients at 550 nm were compared to those measured with a commercial long-path transmissometer.To avoid the absorption of known gases (H2O, NO2, and O3), extinction coefficients at the spectral bands of 325, 394, 472, 550, 580, 680, and 753 nm, with 3 nm window widths, were selected and analyzed for the purpose of the study of the aerosol properties. Importantly, the atmospheric physical properties during the episodes (such as a biomass burning or a dust storm) were investigated by means of the Angstrom parameters and the mass ratio of fine-to-coarse particles. In addition, it was found that the Angstrom exponents decrease monotonously for relative humidity above 50%. |
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