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Title: Influence of air mass origin on aerosol properties at a remote Michigan forest site

The northern Great Lakes region of North America is a large, relatively pristine area. To date, there has only been limited study of the atmospheric aerosol in this region. During summer 2009, a detailed characterization of the atmospheric aerosol was conducted at the University of Michigan Biological Station (UMBS) as part of the Community Atmosphere–Biosphere Interactions Experiment (CABINEX). Measurements included particle size distribution, water-soluble composition, and CCN activity. Aerosol properties were strongly dependent on the origin of the air masses reaching the site. For ~60% of the study period, air was transported from sparsely populated regions to the northwest. During these times aerosol loadings were low, with mean number and volume concentrations of 1630 cm -3 and 1.91 μm 3 cm -3, respectively. The aerosol during clean periods was dominated by organics, and exhibited low hygroscopicities (mean κ = 0.18 at s = 0.3%). When air was from more populated regions to the east and south (~29% of the time), aerosol properties reflected a stronger anthropogenic influence, with 85% greater particle number concentrations, 2.5 times greater aerosol volume, six times more sulfate mass, and increased hygroscopicity (mean к = 0.24 at s = 0.3%). Furthermore, these trends are have themore » potential to influence forest–atmosphere interactions and should be targeted for future study.« less
ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [1] ;  [1]
  1. Washington State Univ., Pullman, WA (United States)
  2. Washington State Univ., Pullman, WA (United States); African Centre for Technology Studies, Nairobi (Kenya)
  3. Washington State Univ., Pullman, WA (United States); Rice Univ., Houston, TX (United States)
  4. Washington State Univ., Pullman, WA (United States); Houston Advanced Research Center, The Woodlands, TX (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Atmospheric Environment (1994)
Additional Journal Information:
Journal Name: Atmospheric Environment (1994); Journal Volume: 107; Journal Issue: C; Journal ID: ISSN 1352-2310
Research Org:
Washington State Univ., Pullman, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; aerosol; trajectory analysis; hygroscopicity
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1250952