• Anderson, T L. and J A. Ogren. 1998. Determining aerosol radiative properties using the TSI 3563 integrating nephelometer. Aerosol Sci. Technol. 29:5769.

    • Search Google Scholar
    • Export Citation
  • Anderson, T L. Coauthors 1996. Performance characteristics of a high-sensitivity, three-wavelength total scatter/backscatter nephelometer. J. Atmos. Oceanic Technol. 13:967986.

    • Search Google Scholar
    • Export Citation
  • Anderson, T L., D S. Covert, J D. Wheeler, J M. Harris, K D. Perry, B E. Trost, D J. Jaffe, and J A. Ogren. 1999. Aerosol backscatter fraction and single scattering albedo: Measured values and uncertainties at a coastal station in the pacific northwest. J. Geophys. Res. 104:2679326807.

    • Search Google Scholar
    • Export Citation
  • Bohren, C F. and D R. Huffman. 1998. Absorption and Scattering of Light by Small Particles. John Wiley and Sons, 544 pp.

  • Bond, T C., T L. Anderson, and D. Campbell. 1999. Calibration and intercomparison of filter-based measurements of visible light absorption by aerosols. Aerosol Sci. Technol. 30:582600.

    • Search Google Scholar
    • Export Citation
  • Carrico, C M., M J. Rood, and J A. Ogren. 1998. Aerosol light scattering properties at Cape Grim, Tasmania, during the First Aerosol Characterization Experiment. J. Geophys. Res. 103:1656516574.

    • Search Google Scholar
    • Export Citation
  • Gong, S L., L A. Barrie, and J P. Blanchet. 1997. Modeling sea-salt aerosols in the atmosphere, 1. Model development. J. Geophys. Res. 102:38053818.

    • Search Google Scholar
    • Export Citation
  • Heintzenberg, J., R J. Charlson, A D. Clarke, C. Liousse, V. Ramaswamy, K P. Shine, M. Wendisch, and G. Helas. 1997. Measurements and modelling of aerosol single-scattering albedo: Progress, problems and prospects. Beitr. Phys. Atmos. 70:249263.

    • Search Google Scholar
    • Export Citation
  • Hess, M., P. Keopke, and I. Schult. 1998. Optical properties of aerosols and clouds: The software package OPAC. Bull. Amer. Meteor. Soc. 79:831834.

    • Search Google Scholar
    • Export Citation
  • Koepke, P., M. Hess, I. Schult, and E P. Shettle. 1997. Global Aerosol Data Set. MPI Meteorologie Hamburg Rep. 243, 44 pp.

  • Li, S., K B. Strawbridge, W R. Leaitch, and A M. Macdonald. 1998. Aerosol backscattering determined from chemical and physical properties and lidar observations over the east coast of Canada. Geophys. Res. Lett. 25:16531656.

    • Search Google Scholar
    • Export Citation
  • Liousse, C., J E. Penner, C. Chuang, J J. Walton, and H. Eddleman. 1996. A global three-dimensional model study of carbonaceous aerosols. J. Geophys. Res. 101:1941119432.

    • Search Google Scholar
    • Export Citation
  • O’Dowd, C D., J A. Lowe, and M H. Smith. 1999. The relative importance of non-sea-salt sulphate and sea-salt aerosol to the marine cloud condensation nuclei population: An improved multi-component aerosol-cloud droplet parameterization. Quart. J. Roy. Meteor. Soc. 125:13111314.

    • Search Google Scholar
    • Export Citation
  • Quinn, P K. and D J. Coffman. 1998. Local closure during the First Aerosol Characterization Experiment (ACE 1): Aerosol mass concentration and scattering and backscattering coefficients. J. Geophys. Res. 103:1657516596.

    • Search Google Scholar
    • Export Citation
  • Seinfeld, J H. and S N. Pandis. 1998. Atmospheric Chemistry and Physics. John Wiley and Sons, 1326 pp.

  • Smirnov, A., Y. Villevalde, N T. O’Neill, A. Royer, and A. Tarussov. 1995. Aerosol optical depth over the oceans: Analysis in terms of synoptic air mass types. J. Geophys. Res. 100:1663916650.

    • Search Google Scholar
    • Export Citation
  • Smith, S R., M A. Bourassa, and R J. Sharp. 1999. Establishing more truth in true winds. J. Atmos. Oceanic Technol. 16:939952.

  • Strawa, A W., R. Castaneda, T. Owano, D S. Baer, and B A. Paldus. 2003. The measurement of aerosol optical properties using continuous wave cavity ring-down techniques. J. Atmos. Oceanic Technol. 20:454465.

    • Search Google Scholar
    • Export Citation
  • Tang, I N. 1996. Chemical and size effects of hygroscopic aerosols on light scattering coefficients. J. Geophys. Res. 101:1924519250.

    • Search Google Scholar
    • Export Citation
  • Tang, I N. 1997. Thermodynamic and optical properties of mixed-salt aerosols of atmospheric importance. J. Geophys. Res. 102:18831893.

    • Search Google Scholar
    • Export Citation
  • Toon, O B., J B. Pollack, and B N. Khare. 1976. The optical constants of several atmospheric aerosol species: Ammonium sulfate, aluminum oxide, and sodium chloride. J. Geophys. Res. 81:57335745.

    • Search Google Scholar
    • Export Citation
  • Zhang, X F., K A. Smith, D R. Worsnop, J. Jimenez, J T. Jayne, and C E. Kolb. 2002. A numerical characterization of particle beam collimation by an aerodynamic lens-nozzle system. Part 1, An individual lens or nozzle. Aerosol Sci. Technol. 36:617631.

    • Search Google Scholar
    • Export Citation
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 66 17 2
PDF Downloads 25 9 1

Optical Properties of Aerosol Particles over the Northeast Pacific

Julia MarshallDepartment of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada

Search for other papers by Julia Marshall in
Current site
Google Scholar
PubMed
Close
,
Ulrike LohmannDepartment of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
ETH Institute for Atmospheric and Climate Science, Zurich, Switzerland

Search for other papers by Ulrike Lohmann in
Current site
Google Scholar
PubMed
Close
,
W. Richard LeaitchMeteorological Service of Canada, Environment Canada, Downsview, Ontario, Canada

Search for other papers by W. Richard Leaitch in
Current site
Google Scholar
PubMed
Close
,
Nicole ShantzCentre for Research in Earth and Space Sciences, York University, Toronto, Ontario, Canada

Search for other papers by Nicole Shantz in
Current site
Google Scholar
PubMed
Close
,
Lisa PhinneyDepartment of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada

Search for other papers by Lisa Phinney in
Current site
Google Scholar
PubMed
Close
,
Desiree Toom-SauntryMeteorological Service of Canada, Environment Canada, Downsview, Ontario, Canada

Search for other papers by Desiree Toom-Sauntry in
Current site
Google Scholar
PubMed
Close
, and
Sangeeta SharmaMeteorological Service of Canada, Environment Canada, Downsview, Ontario, Canada

Search for other papers by Sangeeta Sharma in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

In July 2002, atmospheric aerosol measurements were conducted over the northeast Pacific Ocean as part of the Subarctic Ecosystem Response to Iron Enhancement Study (SERIES). The following aerosol quantities were measured: particle number size distribution, particle scattering and backscattering coefficients at three wavelengths, particle absorption coefficient at one wavelength, and size-segregated particle chemical composition. Using Mie theory to calculate the aerosol particle scattering and absorption coefficients from the size distribution and chemical measurements, closure with the measured optical coefficients is not attained. Discrepancies between the calculated and measured scattering and backscattering coefficients are largely a result of the fact that the nephelometer measures scattering only between 7° and 170°. Over 90% of the total scattering and 50% of the backscattering in this study was not measured by the nephelometer because of the missing forward-scattering (0°–7°) and backscattering (170°–180°) segments of the phase function. During this study the majority of the total scattering and backscattering in the marine boundary layer of this region was a result of coarse particles consisting almost entirely of sea salt.

Corresponding author address: Julia Marshall, Canadian Centre for Climate Modelling and Analysis, University of Victoria, P.O. Box 1700, STN CSC, Victoria, BC V8W 2Y2, Canada. marshall@mathstat.dal.ca

Abstract

In July 2002, atmospheric aerosol measurements were conducted over the northeast Pacific Ocean as part of the Subarctic Ecosystem Response to Iron Enhancement Study (SERIES). The following aerosol quantities were measured: particle number size distribution, particle scattering and backscattering coefficients at three wavelengths, particle absorption coefficient at one wavelength, and size-segregated particle chemical composition. Using Mie theory to calculate the aerosol particle scattering and absorption coefficients from the size distribution and chemical measurements, closure with the measured optical coefficients is not attained. Discrepancies between the calculated and measured scattering and backscattering coefficients are largely a result of the fact that the nephelometer measures scattering only between 7° and 170°. Over 90% of the total scattering and 50% of the backscattering in this study was not measured by the nephelometer because of the missing forward-scattering (0°–7°) and backscattering (170°–180°) segments of the phase function. During this study the majority of the total scattering and backscattering in the marine boundary layer of this region was a result of coarse particles consisting almost entirely of sea salt.

Corresponding author address: Julia Marshall, Canadian Centre for Climate Modelling and Analysis, University of Victoria, P.O. Box 1700, STN CSC, Victoria, BC V8W 2Y2, Canada. marshall@mathstat.dal.ca

Save