The optical properties of aerosol particles must be clearly understood to reduce uncertainty in the prediction of the global climate change. Simultaneous measurements of scattering and absorption coefficients of aerosol particles were conducted in the atmospheric boundary layer over the western North Pacific and the Southern Ocean. For the scattering coefficient, total scattering and backscattering coefficients were measured at three different wavelengths. Over the western North Pacific, significant differences in the Ångström exponent and absorption coefficient were found between polluted and pristine air masses. Over the parts of the Southern Ocean free of sea ice, the Ångström exponent and the ratio of the back-to total-scattering coefficients were uniform. However, over the sea-ice regions, the scattering coefficients were an order of magnitude lower, and the Ångström exponent an order of magnitude higher, than over the parts of the ocean free of sea ice. These differences appear to be due to the fact that the emission of aerosol precursors and sea salt particles is suppressed by sea ice. This study represents the difference in aerosol optical properties as a function of source region and sea condition. These results will contribute to improving the accuracy of estimates of the direct radiative forcing effects due to aerosol particles.

必须清楚地了解气溶胶粒子的光学特性，以减少全球气候变化预测中的不确定性。在北太平洋西部和南大洋的大气边界层中同时测量了气溶胶颗粒的散射和吸收系数。对于散射系数，在三个不同波长下测量了总散射系数和背向散射系数。在北太平洋西部，污染气团和原始气团的 Ångström 指数和吸收系数存在显着差异。在没有海冰的南大洋部分，Ångström 指数和反向散射系数与总散射系数的比率是一致的。然而，在海冰区上空，与没有海冰的海洋部分相比，散射系数低一个数量级，Ångström 指数高一个数量级。这些差异似乎是由于海冰抑制了气溶胶前体和海盐颗粒的排放。这项研究代表了气溶胶光学特性的差异作为源区域和海况的函数。这些结果将有助于提高气溶胶颗粒直接辐射强迫效应估计的准确性。这项研究代表了气溶胶光学特性的差异作为源区域和海况的函数。这些结果将有助于提高气溶胶颗粒直接辐射强迫效应估计的准确性。这项研究代表了气溶胶光学特性的差异作为源区域和海况的函数。这些结果将有助于提高气溶胶颗粒直接辐射强迫效应估计的准确性。