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As well as spectral aerosol optical depth (AOD), aerosol composition andconcentration (number, volume, or mass) are of interest for a variety ofapplications. However, remote sensing of these quantities is more difficultthan for AOD, as it is more sensitive to assumptions relating to aerosolcomposition. This study uses spectral AOD measured on Maritime AerosolNetwork (MAN) cruises, with the additional constraint of a microphysicalmodel for unpolluted maritime aerosol based on analysis of Aerosol RoboticNetwork (AERONET) inversions, to estimate these quantities over open ocean.When the MAN data are subset to those likely to be comprised of maritimeaerosol, number and volume concentrations obtained are physically reasonable.Attempts to estimate surface concentration from columnar abundance, however,are shown to be limited by uncertainties in vertical distribution. ColumnarAOD at 550 nm and aerosol number for unpolluted maritime cases arealso compared with Moderate Resolution Imaging Spectroradiometer (MODIS)data, for both the present Collection 5.1 and forthcoming Collection 6. MODISprovides a best-fitting retrieval solution, as well as the average forseveral different solutions, with different aerosol microphysical models. The"average solution" MODIS dataset agrees more closely with MAN than the"best solution" dataset. Terra tends to retrieve lower aerosol numberthan MAN, and Aqua higher, linked with differences in the aerosol modelscommonly chosen. Collection 6 AOD is likely to agree more closely with MANover open ocean than Collection 5.1. In situations where spectral AOD ismeasured accurately, and aerosol microphysical properties are reasonablywell-constrained, estimates of aerosol number and volume using MAN or similardata would provide for a greater variety of potential comparisons withaerosol properties derived from satellite or chemistry transport model data.However, without accurate AOD data and prior knowledge of microphysicalproperties, such attempts are fraught with high uncertainties

Estimating marine aerosol particle volume and number from Maritime Aerosol Network data