Correction in aerosol mass concentration measurements with humidity difference between ambient and instrumental conditions |
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| Affiliation: | 1. Center for Environmental Remote Sensing, Chiba University, 1-33 Yayoi cho, Inage-Ku, Chiba 263-8522, Japan;2. Chiba Prefectural Environmental Research Center, 1-88 Iwasaki-nishi, Ichihara 290-0046, Japan;1. Instituto Nacional de Investigaciones Nucleares, Centro Nuclear “Nabor Carrillo”, Autopista México-Toluca, Salazar, Edo. Mex., Mexico;2. Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 México, DF, Mexico;1. Condensed Matter Physics Laboratory, National Institute of Physics, University of the Philippines, Diliman, 1101, Quezon City, Philippines;2. Materials Science and Engineering Program, University of the Philippines, Diliman, 1101, Quezon City, Philippines;1. Departamento de Geofísica, Universidad de Concepción, Chile;2. Departamento de Geofísica, Universidad de Chile, Chile |
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| Abstract: | The influence of humidity is considered on the concentration of the suspended particulate matter (SPM) measured with a β-ray counter. The humidity condition inside a small observatory where the counter is located is, in general, different from the ambient condition outside the observatory. From the measured values, the ambient SPM concentration is derived considering the hygroscopic effect of common aerosol species of sea salt (SS), (NH4)2SO4, NH4NO3 and NaNO3. In a case study conducted during September 2005, temperature and humidity were measured both inside and outside the observatory. The average value of the relative humidity is 48% for inside and 78% for outside, resulting in approximately 53% larger SPM mass concentration after the correction. Accordingly, the value of mass extinction efficiency, which is given by the ratio between the optically measured extinction coefficient and the mass concentration, becomes lower after the correction. |
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