| Characteristics of Kd （490） around Nansha Islands in the South China Sea |
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| 引用本文： | 张清凌,陈楚群,施平,殷克东.Characteristics of Kd （490） around Nansha Islands in the South China Sea[J].海洋通报(英文版),2004,6(1):9-17. |
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| 作者姓名： | 张清凌 陈楚群 施平 殷克东 |
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| 作者单位： | LED,SouthChinaSeaInstituteofOceanography,ChineseAcademyofSciences,Guangdong510301 |
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| 基金项目： | This work was jointly supported by project KZCX2-202 from CAS，the project of 818-06-03 from national 863 program and project 97-926-07 of national special program for science and technology. |
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| 摘 要： | The diffusion attenuation coefficient for downwelling irradiance, Ka(490), is an important optical parameter of seawater. The optical property, Kd(490), around Nansha Islands in the South China Sea was analyzed based on optical data profiles measured with SPMR (SeaWiFS Profiling Multichannel Radiometer) and SMSR ( SeaWiFS Multichannel Surface Reference ) instrument in April and May, 1999. The results show that Kd(490) is closely correlated with chlorophyll-a concentration, Ccgka, and that the vertical distribution of Kd(490) shows the strong stratification of the water column in this area. Kd(490) has a similar vertical co-variation as KL(490), the diffusive attenuation coefficient for upwelling radiance.Both coefficients increase with depth in the upper layer, where KL(490) is greater than Kd(490); and after a depth, approximatively at the chlorophyll maximum, they decrease with depth, with the former being smaller than the latter.
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| 关 键 词： | 漫射 衰减系数 海水光学参数 南沙群岛 |
Characteristics of Kd (490) around Nansha Islands in the South China Sea |
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| Zhang Qingling.Characteristics of Kd (490) around Nansha Islands in the South China Sea[J].Marina Science Bulletin,2004,6(1):9-17. |
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| Authors: | Zhang Qingling |
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| Abstract: | The diffusion attenuation coefficient for downwelling irradiance, Kd (490), is an important optical parameter of seawater. The optical property, Kd (490), around Nansha Islands in the South China Sea was analyzed based on optical data profiles measured with SPMR ( SeaWiFS Profiling Multichannel Radiometer ) and SMSR ( SeaWiFS Multichannel Surface Reference ) instrument in April and May, 1999. The results show that Kd (490) is closely correlated with chlorophyll-a concentration, Cchl.a, and that the vertical distribution of Kd (490) shows the strong stratification of the water column in this area. Kd (490) has a similar vertical co-variation as KL (490), the diffusive attenuation coefficient for upwelling radiance. Both coefficients increase with depth in the upper layer, where KL (490) is greater than Kd (490); and after a depth, approximatively at the chlorophyll maximum, they decrease with depth, with the former being smaller than the latter. |
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| Keywords: | South China Sea Nansha Islands diffusion attenuation coefficient Kd (490) underwater spectral measurement |
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