Dust characteristics over the North Pacific observed through shipboard measurements during the ACE-Asia experiment |
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| Affiliation: | 1. Department of Earth and Environmental Sciences, Rutgers University, Newark, NJ 07102, USA;2. Department of Mechanical & Aerospace Engineering, Arizona State University, Tempe, AZ 85287, USA;1. University of Strathclyde, Department of Mathematics and Statistics, 26 Richmond Street, Glasgow G1 1XH, United Kingdom;2. Health Protection Scotland, 5 Cadogan Street, Glasgow G2 6QE, United Kingdom;3. International Prevention Research Institute (iPRI), 95 cours Lafayette, 69006 Lyon, France;1. Institute of Chemistry, Eötvös University, H-1518 Budapest, P.O. Box 32, Hungary;2. Department of Earth and Environmental Sciences, University of Pannonia, H-8200 Veszprém, P.O. Box 158, Hungary;3. MTA-PE Air Chemistry Research Group, H-8200 Veszprém, P.O. Box 158, Hungary;4. Department of Physics, University of Helsinki, FI-00014 Helsinki, P.O. Box 64, Finland;1. Inserm, CépiDc, 80, rue du Général-Leclerc, 94270 Le Kremlin-Bicêtre, France;2. Laboratoire espace santé et territoires, Nanterre, France;3. UMRS 1018, épidémiologie des déterminants professionnels et sociaux de la santé, Inserm U1018, centre de recherche en épidémiologie et santé des populations (CESP), 94807 Villejuif, France;4. UMRS 1018, University of Versailles Saint-Quentin (UVSQ), 94807 Villejuif, France;1. Department of Gastrointestinal Oncology, Royal Marsden Hospital, Sutton, UK;2. Department of Gastrointestinal Oncology, Royal Marsden Hospital, Sutton, UK;3. Royal Marsden Hospital, Sutton, UK;4. Royal Marsden Hospital, Sutton, UK;5. Heartlands Hospital, Bordesley Green East, Birmingham, UK;6. Department of Gastrointestinal Oncology, Royal Marsden Hospital, Sutton, UK;7. Department of Gastrointestinal Oncology, Royal Marsden Hospital, Sutton, UK;1. Howard University Hospital, Howard University, Washington, DC;2. Department of Medicine, College of Medicine, Howard University, Washington, DC;1. University of Helsinki and Helsinki University Hospital, Department of Obstetrics and Gynecology, 00029 Helsinki, Finland;2. THL-National Institute for Health and Welfare, PO BOX 30, 00271 Helsinki, Finland;3. Heart Center, Turku University Hospital and Department of Clinical Medicine, University of Turku, Turku, Finland;4. Central Hospital of North Karelia, Joensuu, Finland;5. University of Eastern Finland, Kuopio, Finland;6. Research Institute of Internal Medicine, Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland;7. Folkhälsan Research Center, Biomedicum, 00029 Helsinki, Finland |
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| Abstract: | To examine the diversity of chemical and physical properties of aerosol particles, in particular dust, over the North Pacific, aerosols were collected along ∼32°N latitude between 140°E and 170°W longitude aboard the NOAA R/V Ronald H. Brown during the Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) in the spring 2001. A total of 11,482 aerosol particles were examined through individual-particle analysis. Results indicate that dust particles over this region were dominated primarily by Si-rich particles, including aluminosilicates that contain Fe. Fe is also present as separate Fe-rich particles. Additional common particle types include Ca- and S-rich particles; many of the later appear to represent soil-derived calcium carbonate and its reaction products whereas the former are predominantly reaction products of sea salt and sulfate. Particles are often aggregates of different types including pollution-derived substances and highly heterogeneous, both internally and externally. Dust particles are non-spherical, having circularities from 1.0 up to 4.5, suggesting the high degree of complexity of particle shape. The majority of dust particles were dominated by particles with median diameters from 0.67 to 1.26 μm. However, dust particles with diameters of 5 μm or even larger do exist associated with those events of dust originated from Asian desert areas. The existence of soot and Fe-rich particles over this region indicates the influence of fossil fuel sources in Asia. Aerosol Fe from both Asian desert and fossil fuel combustion may contribute to the nutrient Fe in the surface waters of the North Pacific basin. Therefore, the transport of Asian dust associated with species of fossil fuel burning in the spring may play an important role in altering the natural composition of aerosols over the North Pacific. |
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