长江口及其邻近海域CDOM光谱吸收特性分析

海洋学研究 ›› 2013, Vol. 31 ›› Issue (1): 53-58.

长江口及其邻近海域CDOM光谱吸收特性分析

范冠南, 毛志华, 陈鹏, 王天愚, 张琳

卫星海洋环境动力学国家重点实验室,国家海洋局第二海洋研究所,浙江杭州 310012

收稿日期:2012-04-07 修回日期:2012-06-28 出版日期:2013-03-15 发布日期:2022-11-29
作者简介:范冠南(1988-),女,江苏南通市人,硕士研究生,主要从事海洋水色遥感方面的研究。E-mail:fgn1335068@126.com
基金资助:
国家海洋公益性行业科研专项经费资助项目(201005030);国家科技支撑计划课题资助项目(2012BAH32B01);国家自然科学基金资助项目(40576080)

Optical characteristics of Colored Dissolved Organic Matter (CDOM) in Changjiang River Estuary and its adjacent sea areas

FAN Guan-nan, MAO Zhi-hua, CHEN Peng, WANG Tian-yu, ZHANG Lin

State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, SOA, Hangzhou 310012, China

Received:2012-04-07 Revised:2012-06-28 Online:2013-03-15 Published:2022-11-29

摘要/Abstract

摘要： 研究了长江口及其邻近海域有色可溶性有机物(CDOM)的光吸收特性,分析了CDOM浓度(吸收系数a(440))、光谱斜率(S_g)与盐度的关系。结果表明:长江口及其邻近海域CDOM的a(440)变化范围为0.21~0.85 m^-1,平均值为0.44 m^-1;S_g值的范围为0.013 3~0.016 7 nm^-1,平均值为0.014 nm^-1;a(440)的水平分布表现为长江口海区比外海区高,S_g的水平分布表现为长江口海区比外海区低,反映了长江口海区CDOM中的腐殖酸成分比外海区大。研究区内a(440)与盐度、S_g与盐度明显线性相关,表明CDOM在河口混合行为中呈保守行为,CDOM具有良好的保守性质。

关键词: CDOM, 吸收系数, 光谱斜率, 长江口

Abstract: Optical properties of Chromophoric Dissolved Organic Matter (CDOM) have played an important role in quantitative water-color remote sensing retrieval. The optical properties of CDOM in coastal waters of Changjiang River Estuary were investigated in June of 2011. This area is affected by terrigenous factor strongly with different hydro-dynamic characteristics. CDOM absorption coefficient and spectral slope were got through sampling, laboratory measurements and subsequent data processing. Then, CDOM absorption cofficient and spectral slope were discussed. CDOM absorption coefficients at 440 nm [a(440)] varied between 0.21 and 0.85 m^-1, with an average value of 0.44 m^-1.In addition, the spectral slope, S_g varied between 0.013 3~0.016 7 nm^-1, with an average value of 0.014 nm^-1. Significant spatial difference in absorption cofficient and spectral slope was observed varied tremendously in the estuary and the offshore area. The higher absorption coefficients of the cruise appeared in the estuary area while the lower spectral slope of the cruise appeared in the area which is greatly influenced by the terrestrial sources; the lower absorption coefficients appeared in the offshore area while the higher spectral slope of the cruise appeared in the area which is greatly influenced by the mixing of terrestrial humic sources and seawater. A significant positive relationship between salinity and a(440) was found in the whole area showing conservative behavior of CDOM. There was a good correlative relationship between the spectral slope S_g and salinity in the whole area, which also reflected conservative behavior of CDOM.

Key words: CDOM, spectral absorption coefficient, spectral slope, Changjiang River Estuary

中图分类号:

P733.3⁺1

范冠南, 毛志华, 陈鹏, 王天愚, 张琳. 长江口及其邻近海域CDOM光谱吸收特性分析[J]. 海洋学研究, 2013, 31(1): 53-58.

FAN Guan-nan, MAO Zhi-hua, CHEN Peng, WANG Tian-yu, ZHANG Lin. Optical characteristics of Colored Dissolved Organic Matter (CDOM) in Changjiang River Estuary and its adjacent sea areas[J]. Journal of Marine Sciences, 2013, 31(1): 53-58.

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