Aerosol number-to-volume-relationship and relative humidity in the eastern Atlantic
Hegg, Dean A.
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Measurements acquired from the Office of Naval Research (ONR) Pelican research aircraft during the second Aerosol Characterization Experiment (ACE 2) are analyzed to derive values for the dry (RH = 40%) aerosol number‐to‐volume ratio in the submicron size range. This ratio is found to be relatively constant, with a mean value of 168±21 μm−3, in agreement with previous studies elsewhere. The impact of ambient relative humidity (RH) on the dry number‐to‐volume is also quantified and a procedure for estimating the dry from the ambient ratio established. Finally, the feasibility of a remote retrieval of the aerosol number concentration in the submicron size range, essentially the cloud condensation nucleus concentration active at a nominal 0.2% supersaturation, is partially assessed.
The article of record as published may be found at http://dx.doi.org/10.1029/1999JD901037
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