Seasonal estimates of sea-salt aerosol particle concentration distributions 15 m above the sea are presented on global contour maps. Measured data from a variety of sources relating atmospheric sea-salt concentration to wind speed have been combined, yielding relationships of form C=exp (as+b), where C is sea-salt concentration in micrograms per cubic meter and s is the horizontal wind speed in meters per second. These relationships, coupled with a Gaussian wind speed frequency distribution, allow us to calculate the atmospheric sea-salt concentration accounting for the variance about mean wind speeds. We use monthly wind mean speed and variance information in 5¿¿5¿ latitude/longitude squares over the world ocean to estimate the global sea-salt aerosol particle mass distribution. The atmospheric sea-salt concentrations in the northern hemisphere marine troposphere display a substantial seasonal dependence. The 3-month seasonal average sea-salt concentrations in this region differ by a factor of 2-3 between the boreal winter and summer, and the highest values are between 40 and 49 μg m-3. The seasonal variability of atmospheric sea-salt concentrations in the high-latitude southern hemisphere is much less than that in the northern hemisphere, varying by less than a factor of 2 between the austral winter and summer, and again the highest values are about 45 μg m-3. The equatorial areas have uniformly lower atmospheric sea-salt concentrations than the high-latitude regions. The monsoonal winds over the Indian Ocean produce sea-salt concentrations in excess of 40 μg m-3 for the 3-month boreal summer average.