中文摘要：

气溶胶光学厚度是大气校正所需要的重要参数。利用2006年9月7—30日中科院南海海洋研究所公开航次的多波段太阳光度计资料，得到了南海北部海域的气溶胶光学厚度。分析结果表明，南海北部海域气溶胶光学厚度在一天内的变化非常明显，最小值可达0．1（870nm），最大值为0．9（440nm），而日平均气溶胶光学厚度在0．2～0．6之间。结合同步观测气象数据，发现从陆地方向吹来的风，当风速达4m／s，对气溶胶的光学厚度有非常明显的影响，而从大洋方向吹来的风，对气溶胶的光学厚度影响不明显。

英文摘要：

The aerosol optical thickness is the primary parameter in the atmospheric correction algorithm. Based on the multi-wavelength sun-photometer data of an open navigation of South China Sea Institute of Oceanology, CAS, from September 7th to 30th 2006, the optical thickness of the northern South China Sea is obtained. The results indicate that the aerosol optical thickness of the northern South China Sea has extremely obvious diurnal change. The minimum value can be as low as 0.1（870 nm）, the maximum value is 0.9（440 nm） and daily average optical thickness is about 0.2-0.6. Based on meteorological data simultaneously observed, it is discovered that the wind blowing from the land direction has extremely obvious influence on the aerosol optical thickness when it reaches 4m/s, but the wind blowing from the ocean direction does not have obvious influence on the optical thickness of aerosols.