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学科主题: Limnology; Oceanography
题名: Variation in downwelling diffuse attenuation coefficient in the northern South China Sea
作者: Wang, GF ; Cao, WX ; Yang, DT ; Xu, DZ
通讯作者: wxcao@scsio.ac.cn
关键词: the downwelling diffuse attenuation coefficient ; chlorophyll a ; bio-optical model ; the northern South China Sea
刊名: CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
发表日期: 2008
卷: 26, 期:3, 页:323-333
收录类别: sci
部门归属: [Wang Guifen; Cao Wenxi; Yang Dingtian; Xu Dazhi] Chinese Acad Sci, S China Sea Inst Oceanol, LED Lab, Guangzhou 510301, Guangdong, Peoples R China; [Wang Guifen] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
项目归属: LED
摘要: The diffuse attenuation coefficient for downwelling irradiance (K-d(lambda)) is an important parameter for ocean studies. Based on the optical profile data measured during three cruises in the northern South China Sea in autumn from 2003 to 2005, variations in the K-d(lambda) spectra were analyzed. The variability of K-d(lambda) shows much distinct features in both magnitude and spectra pattern, it is much higher in coastal waters than that of open oceanic waters; and the blue-to-green (443/555) ratio of K-d(lambda) tends to increase with chlorophyll a concentration ([Chl-a]) from open ocean to coastal waters. These characteristics can be explained most by the increase of a (w+p)(443)/a (w+p)(555) with [Chl-a]. In short waveband, the relation between K-d(lambda)-K-w(lambda) and [Chl-a] can be well described by a power law function, indicating the large contribution of phytoplankton to the variations in K-d(lambda). As for the spectral model of the diffuse attenuation coefficient, there are good linear relationships between Kd(490) and K-d(lambda) in other wavelengths with own slope and intercept of a linear functions in the spectral range 412-555 nm. K-d(490) is well correlated with the spectral ratio of remote sensing reflectance; and should enough measurement data are given, this empirical algorithm would be used in the K-d(lambda) retrieval from ocean color satellite data. The variation in K-d(lambda) provides much useful information for us to study the bio-optical property in the northern South China Sea.
原文出处: 查看原文
WOS记录号: WOS:000258601000015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5977
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Wang, GF; Cao, WX; Yang, DT; Xu, DZ.Variation in downwelling diffuse attenuation coefficient in the northern South China Sea,CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2008,26(3):323-333
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