摘要
根据2003—2005年三年夏季渤海及北黄海海上调查资料.使用浑浊度系数α和埃斯特朗指数β描述气溶胶的光学厚度,对该海域上空气溶胶分布特征进行了分析。调查数据显示,浑浊度系数α的范围是0.03~2.76,大部分站点α集中分布在1个比较小的范围内;埃斯特朗指数β的范围是0.12~1.64.其分布较分散。在β=1.3处存在一个β最大值,在8〈0.8的范围分布相对均匀。分析还发现,气溶胶的光学厚度与标准化气压有明显的负相关(相关系数为-0.42),特别是二者对应变化曲线的跨零点基本重合。在数据分析的基础上,作者提出了两尺度气溶胶的光学厚度模型以及对应的两尺度气溶胶散射的反射率模型,这样可将传统气溶胶模型中乘幂形式的两个变量结合改为两个变量线性组合,从而将气溶胶散射的反射率并入整体反演公式,使之有可能被用于水色遥感的线性系统算法,从而避免传统大气校正的过程。这为二类水体水色反演提供了一种新思路。
Based on th analysis of survery data in each summer of 2003--2005, aerosol distribution characters in the area of Bohai Sea and North Huanghai Sea are given in this paper. Angstrom turbidity coefficient a and Angstrom exponent β are used to characterize the aerosol optical thickness (AOT). The data showed that α, with a range of 0.03~2.76, of most observation points distribute in a small area, while β, with a range of 0.12~1.64, have a dispersed distribution. On the basis of data analysis, a new AOT model and corresponding aerosol scattering reflection model are put forward, which transform the former two variables in power form to a pair of linear combined variables. This transformation makes sense, for it makes the reflection of aerosol admitted into a wholly inversing algorithm with air-sea linear system. In this algorithm the atmospheric correction can be left out, and it will be much more suitable for remote sensing of water color in class Ⅱ water than former algorithms.
出处
《海洋湖沼通报》
CSCD
北大核心
2008年第3期13-26,共14页
Transactions of Oceanology and Limnology
基金
国家863计划项目(2006AA09Z140)资助
关键词
水色遥感气溶胶
光学厚度浑浊度系数
埃斯特朗指数
remote sensing of water color
aerosol optical thickness (AOT)
Angstrom turbidity coefficient
Angstrom exponent