大亚湾水体后向散射比率的光谱变化

doi:10.11978/j.issn.1009-5470.2010.02.039

热带海洋学报 ›› 2010, Vol. 29 ›› Issue (2): 39-45.doi: 10.11978/j.issn.1009-5470.2010.02.039cstr: 32234.14.j.issn.1009-5470.2010.02.039

大亚湾水体后向散射比率的光谱变化

周雯1, 曹文熙1, 杨跃忠1, 王桂芬1, 赵俊1,2, 孙兆华1,2, 许占堂1,2

1. 中国科学院南海海洋研究所热带海洋动力学重点实验室, 广东广州 510301; 2. 中国科学院研究生院, 北京 100039

收稿日期:2009-05-06 修回日期:2009-11-09 出版日期:2010-03-23 发布日期:2010-03-23
作者简介:周雯(1982—), 女, 湖南省邵阳市人, 助理研究员, 主要从事海洋光学技术的研究。
基金资助:
中国科学院重要方向性项目(KZCX2-YW-215); 国家自然科学基金项目(40906022; 40606011; 40906021;U0933005)

Spectral variability of particulate backscattering ratio in the Daya Bay

ZHOU Wen1, CAO Wen-xi1, YANG Yue-zhong1, WANG Gui-fen1, ZHAO Jun1,2, SUN Zhao-hua1,2, XU Zhan-tang1,2

1. LED, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; 2. Graduate Univ. of Chinese Academy of Sciences, Beijing 10039, China

Received:2009-05-06 Revised:2009-11-09 Online:2010-03-23 Published:2010-03-23

摘要/Abstract

摘要：

采用2007年5月大亚湾浮标定点航次采集的生物-光学数据, 分析了大亚湾水体后向散射比率的光谱变化及其影响因素。分析结果表明, 660nm处后向散射比率变化范围在0.0040—0.0245之间, 均值为0.0082±0.0032, 实测后向散射比率光谱波段间的相对变化不超过15%; 颗粒后向散射比率随着叶绿素a浓度增加呈减小的趋势, 高叶绿素浓度显著对应较低的后向散射比率; 粒径是影响大亚湾水体后向散射比率的重要因素之一, 随着水体中Junge粒级斜率的增大, 颗粒后向散射比率显著增大; 折射率的变化也对后向散射比率产生一定影响, 类似的水体粒径分布情况下, 浮游植物与非藻类物质相对贡献的变化将导致折射率的明显变化, 并将主导水体后向散射比率的变化。

关键词: 后向散射比率, 光谱变化, 颗粒粒径分布, 颗粒折射率

Abstract:

Variability of particulate backscattering ratio and its interpretation were examined using in-situ measurements performed during May 2007 in the Daya Bay. The results indicated that the particulate backscattering ratio values range between 0.004 and 0.0245, with a mean value of 0.0082±0.0032. There was some spectral dependence of the particulate backscattering ratio, and less than 15% variability between wavelengths was estimated. A global decreasing of particulate backscattering ratio with increasing chlorophyll concentration was visible, and the low backscattering ratios were observed in water with high chlorophyll concentration. Particle-size distribution slope was the main factor controlling the variability of particles backscattering ratio: The particle backscattering ratio increased with particle-size distribution slope. Average particle refractive index was another influencing factor. With similar particle-size distribution, the amount of non-pigment material relative to phytoplankton that was characterized by the variability of refractive index had a strong effect on particulate backscattering ratio.

Key words: backscattering ratio, spectral variability, particle-size distribution, refractive index

中图分类号:

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周雯,曹文熙,杨跃忠,王桂芬,赵俊,孙兆华,许占堂,. 大亚湾水体后向散射比率的光谱变化[J]. 热带海洋学报, 2010, 29(2): 39-45.

ZHOU Wen,CAO Wen-xi,YANG Yue-zhong,WANG Gui-fen,ZHAO Jun,SUN Zhao-hu. Spectral variability of particulate backscattering ratio in the Daya Bay[J]. Journal of Tropical Oceanography, 2010, 29(2): 39-45.

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大亚湾水体后向散射比率的光谱变化

Spectral variability of particulate backscattering ratio in the Daya Bay

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