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    Original Research Papers

    A comparison of aerosol chemical and optical properties from the 1st and 2nd Aerosol Characterization Experiments

    Authors:

    P. K. Quinn ,

    Pacific Marine Environmental L aboratory, NOAA, 7600 Sand Point Way NE, Seattle, WA 98115; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98195, US
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    T. S. Bates,

    Pacific Marine Environmental L aboratory, NOAA, 7600 Sand Point Way NE, Seattle, WA 98115; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98195, US
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    D. J. Coffman,

    Pacific Marine Environmental L aboratory, NOAA, 7600 Sand Point Way NE, Seattle, WA 98115; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98195, US
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    T. L. Miller,

    Pacific Marine Environmental L aboratory, NOAA, 7600 Sand Point Way NE, Seattle, WA 98115; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98195, US
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    J. E. Johnson,

    Pacific Marine Environmental L aboratory, NOAA, 7600 Sand Point Way NE, Seattle, WA 98115; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98195, US
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    D. S. Covert,

    Pacific Marine Environmental L aboratory, NOAA, 7600 Sand Point Way NE, Seattle, WA 98115; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98195, US
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    J.-P. Putaud,

    Environment Institute (JRC), European Commission, Ispra, IT
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    C. Neusüß,

    Institute for Tropospheric Research, Permoserstr 15, Leipzig D, 04303, DE
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    T. Novakov

    Lawrence Berkeley National Laboratory, Berkeley, CA 94720, US
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    Abstract

    Shipboard measurements of aerosol chemical composition and optical properties were made during both ACE-1 and ACE-2. ACE-1 focused on remote marine aerosol minimally perturbed by continental sources. ACE-2 studied the outflow of European aerosol into the NE Atlantic atmosphere. A variety of air masses were sampled during ACE-2 including Atlantic, polar, Iberian Peninsula, Mediterranean, and Western European. Reported here are mass size distributions of non-sea salt (nss) sulfate, sea salt, and methanesulfonate and submicron and supermicron concentrations of black and organic carbon. Optical parameters include submicron and supermicron aerosol scattering and backscattering coefficients at 550 nm, the absorption coefficient at 550±20 nm, the Ångström exponent for the 550 and 700 nm wavelength pair, and single scattering albedo at 550 nm. All data are reported at the measurement relative humidity of 55%. Measured concentrations of nss sulfate aerosol indicate that, relative to ACE-1, ACE-2 aerosol during both marine and continental flow was impacted by continental sources. Thus, while sea salt controlled the aerosol chemical composition and optical properties of both the submicron and supermicron aerosol during ACE-1, it played a relatively smaller role in ACE-2. This is confirmed by the larger average Ångström exponent for ACE-2 continental aerosol of 1.2±0.26 compared to the ACE-1 average of -0.03±0.38. The depletion of chloride from sea salt aerosol in ACE-2 continental air masses averaged 55±25% over all particle sizes. This compares to the ACE-2 marine average of 4.8±18% and indicates the enhanced interaction of anthropogenic acids with sea salt as continental air masses are transported into the marine atmosphere. Single scattering albedos averaged 0.95±0.03 for ACE-2 continental air masses. Averages for ACE-2 and ACE-1 marine air masses were 0.98±0.01 and 0.99±0.01, respectively.

    How to Cite: Quinn, P.K., Bates, T.S., Coffman, D.J., Miller, T.L., Johnson, J.E., Covert, D.S., Putaud, J.-P., Neusüß, C. and Novakov, T., 2000. A comparison of aerosol chemical and optical properties from the 1st and 2nd Aerosol Characterization Experiments. Tellus B: Chemical and Physical Meteorology, 52(2), pp.239–257. DOI: http://doi.org/10.3402/tellusb.v52i2.16103
      Published on 01 Jan 2000
    Peer Reviewed
     CC BY 4.0
     Accepted on 13 Sep 1999            Submitted on 4 Feb 1999

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