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Airborne measurements of aerosol light-scattering efficiencies are presented for a portion of the northeast Atlantic seaboard of the United State during July 1993. The measurements suggest a value for the sulfate light-scattering efficiency in the range 2.2–3.2 m2 g−1, which is lower than the value used in recent modeling assessments of the climate impact of aerosols. In general the sulfate light-scattering efficiency decreased with increasing altitude in a manner consistent with concurrent measurements of aerosol size distributions. Some limited measurements of cloud condensation nuclei and sea-salt particles are also presented.
Hegg et al. (Sun,) studied this question.