摘要
通过与地基气溶胶观测数据的对比,确认了SeaWiFS气溶胶光学厚度产品用于研究中国海域气溶胶分布和变化特征的有效性。在此基础上,分析了中国海域气溶胶光学厚度的季节变化和地理分布特征。研究结果表明,中国东部海域平均气溶胶光学厚度存在以中纬度为中心的纬向分布;受沙尘、季风气候的影响,中国海域气溶胶光学厚度存在季节变化,不同海区有不同的季节变化和分布特征。渤海、黄海及东海有类似的变化特征,春季都受到沙尘气溶胶的影响,使中国东部海域气溶胶光学厚度普遍高于0.160,且对东海的影响最大;夏、秋季逐渐减小,冬季有所回升。南海气溶胶光学厚度均值为0.150,随时间变化不明显,但地理分布变化显著;受季风气候的影响,从春季到冬季,气溶胶光学厚度高值中心从高纬海域向低纬海域转移,范围也逐渐扩大。冬季南海大部分海域气溶胶光学厚度都达到0.160以上,是整个中国海域冬季气溶胶光学厚度最大的海区。气溶胶光学厚度的季节变化和地理分布特征为研究中国海区域气候变化和海洋生态提供了依据。
Comparing with the derived aerosol optical thickness （AOT） from ground radiance measurements at 870 nm using the sun photometer, we determine the validity of study on aerosol distribution and variety over the China Seas using the SeaWiFS-derived aerosol products at 865 nm. The spatial distribution and temporal variation of the AOT over the China Seas are analyzed using those monthly-mean aerosol products. Results show that the temporal-mean AOT has high-value at the mid-latitude over the China Seas. Due to the influence of Asian dust and monsoon, the distinct temporal and spatial distribution of the AOT are presented. Their characteristics vary with different area of the China Seas. The feature is similar over Bohai Sea, Huanghai Sea and Donghai Sea. In spring, the effect of the Asian dust makes AOT 〉0. 160 over the whole East China Seas, and reaches the most over Donghai Sea. The value and region begin to reduce during summer and autumn, and then enlarge slowly in winter. Over the South China Sea （SCS） the mean value reaches 0. 150, and the AOT changes unapparent with time, but it has notable spatial change. The center of high value transfers from high-latitude to low-latitude and the area extendes gradually from sprint to winter due to the effect of monsoon. In winter, the AOT （〉 0. 160 over the most SCS region） is highest over the China Seas. These results provide the base for marine regional climate and ecology research.
出处
《海洋学研究》
北大核心
2007年第1期80-87,共8页
Journal of Marine Sciences
基金
国家海洋局青年基金资助项目(2005404)
