Aerosol concentrations observed at Mt. Haruna,Japan, in relation to long-range transport of Asian mineral dust aerosols |
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| Authors: | Hiroshi Takahashi Hiroaki Naoe Yasuhito Igarashi Yayoi Inomata Nobuo Sugimoto |
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| Affiliation: | 1. Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA;2. Earth Sciences Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA;3. Joint Center for Earth Science and Technology, University of Maryland at Baltimore County, Baltimore, MD, USA;4. Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA;5. NASA Langley Research Center, Hampton, VA, USA;6. Universities Space Research Association, Columbia, MD, USA;7. Department of Physics, University of Maryland at Baltimore County, Baltimore, MD, USA;1. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China;2. Environmental Meteorology Forecast Center of Beijing–Tianjin–Hebei, China Meteorological Administration, Beijing 100089, China;3. China Meteorological Administration, Beijing 100081, China;4. Beijing Municipal Meteorological Observatory, Beijing 100081, China |
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| Abstract: | As a part of the effort to understand the structure of long-range transported aerosol plumes and local pollution, aerosol observations monitored the mass concentrations and number-size distributions during the period August 2006 to July 2009 near the top of Mt. Haruna (1365 m), an isolated mountain in the Kanto Plain in Japan. The mass concentrations observed at Mt. Haruna and plain sites showed a seasonal variation with a maximum in spring and summer, respectively. The spring peaks in aerosols at Mt. Haruna were probably caused by long-range transport of mineral dust and anthropogenic particles from the Asian continent. The summer peaks at the plain sites was attributed to local pollution from the Tokyo metropolitan area. Three examples of 2007 Asian dust events were investigated to show that aerosols may be dispersed in a complicated three-dimensional structure and that delayed arrivals of the dust plumes at plain sites compared to Mt. Haruna were not a rare case. Because of the boundary layer being stable at night, the dust layer was advected eastward without the vertical mixing before sunrise. This study suggests that after thermal convection activated by sunlight during daytime Asian dust transported in the free troposphere may be brought down into the atmospheric boundary layer, increasing the dust concentration there. |
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