Hourly averages of corrected light scattering integrals in six wavelength investigated during the Atlantic Expedition of RV \"Meteor\" 1969 (Table 2)

With a 6-channel integrating nephelometer spectral scattering properties of the atmospheric aerosol have been measured during the third part of the Atlantic Expedition 1969. A meridional cross section of light scattering integrals in the wavelength range 0.475 µm to 0.924 µm was recorded reaching from 10° S to 60° N along 30° W. With a new algorithm the time series of hourly scattering spectra was inverted yielding a first meridional cross section of the median radius of the number size distribution in situ. Three air mass regimes could be distinguished in the course of the experiment, the first one being the extremely clean air of the SE-trade south of the ITC. An abrupt increase in light scattering marked the hemispheric change when the ship entered the NE-trade which was heavily loaded with Sahara dust. North of the trade region the ship sailed through maritime North Atlantic air masses with highly variable light scattering and a slow decrease in median radius with latitude.1969年大西洋考察第三次航次期间，研究人员采用六通道积分浊度计（6-channel integrating nephelometer）开展了大气气溶胶光谱散射特性的原位观测。本次观测获取了沿西经30°、从南纬10°延伸至北纬60°，波长范围0.475 μm至0.924 μm的光散射积分经向剖面。本研究通过全新算法对逐小时散射光谱的时间序列进行反演，首次获得了大气气溶胶数浓度粒径分布中值半径的原位经向剖面。实验过程中共可区分出三类气团：第一类为热带辐合带（Intertropical Convergence Zone, ITC）以南东南信风带内的极端清洁大气；当科考船驶入受撒哈拉沙尘重度污染的东北信风带时，光散射强度出现突变，标志着半球气团类型的转变；信风带以北区域，科考船航行于北大西洋海洋性气团中，该区域光散射强度波动显著，且气溶胶粒径中值半径随纬度升高呈缓慢递减趋势。