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引用本文:段洪涛,马荣华,孔维娟,郝景燕,张寿选.太湖沿岸水体CDOM吸收光谱特性.湖泊科学,2009,21(2):242-247. DOI:10.18307/2009.0213
DUAN Hongtao,MA Ronghua,KONG Weijuan,HAO Jingyan,ZHANG Shouxuan.Optical properties of chromophoric dissolved organic matter in Lake Taihu. J. Lake Sci.2009,21(2):242-247. DOI:10.18307/2009.0213
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太湖沿岸水体CDOM吸收光谱特性
段洪涛, 马荣华, 孔维娟, 郝景燕, 张寿选
中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
摘要:
有色可溶性有机物(CDOM)吸收光谱特性研究对于水色定量遥感反演具有重要作用.通过2007年6月10日至6月18日太湖沿岸68个CDOM吸收光谱曲线和水质参数实测数据,分析了CDOM吸收光谱曲线特征以及ag(440)、Sg值及其相关关系等,结果表明:太湖沿岸水体CDOM吸收光谱曲线表现为两种类型,贡湖湾CDOM吸收系数明显高于太湖其他沿岸水域,ag(440)最高值即出现在贡湖湾;同时,梅梁湾、贡湖湾、镇湖湾、光富湾等ag(440)高于沿岸水体平均值,而南部3个湖湾皆低于平均值.另外,贡湖湾Sg值较小,且与ag(440)呈现出较好的关系;而沿岸其它水体Sg值与ag(440)虽然呈现负相关,但关系不明显.这对于了解太湖水体CDOM特性以及定量反演有一定的意义和作用.
关键词:  黄色物质  ag(440)  Sg  贡湖湾
DOI:10.18307/2009.0213
分类号:
基金项目:国家自然科学基金(40801137,40871168,40671138);中国科学院“优秀博士学位论文、院长奖获得者”科研启动专项资金(07YJ011001);中国科学院知识创新工程领域前沿项目资助;(CXNIGLAS200807)联合资助
Optical properties of chromophoric dissolved organic matter in Lake Taihu
DUAN Hongtao, MA Ronghua, KONG Weijuan, HAO Jingyan, ZHANG Shouxuan
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
Researches on optical properties of Chromophoric Dissolved Organic Matter (CDOM) has played an important role in quantitative water-color remote sensing retrieval. The optical properties of CDOM in coastal waters of Lake Taihu were investigated from June 10 to June 18 in 2007. The results show that the specific absorption coefficient of CDOM varied significantly and was higher apparently in Gonghu Bay than in other areas. The specific absorption coefficient at 440nm (ag(440)) also showed a similar trend, and it reached the highest value in Gonghu Bay. The ag(440) in waters of Meiliang Bay, Zhenhu Bay and Guangfu Bay also showed an increased trend. On the contrary, the spectral slope coefficient (Sg) in Gonghu Bay was lower than others, and showed a better correlation with ag(440), while Sg in other bays was higher and showed a poor correlation with ag(440). The results demonstrated that it is important to learn the optical properties of CDOM in Lake Taihu, which would then allow higher precision in remote sensing applications
Key words:  CDOM  ag(440)  Sg  Gonghu Bay
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