| Optical detection of Prorocentrum donghaiense blooms based on multispectral reflectance |
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| 作者姓名： | TAO Bangyi PAN Delu MAO Zhihu SHEN Yuzhang ZHU Qiankun CHEN Jianyu |
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| 作者单位： | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| 基金项目： | The National Basic Research Program of China (973 Program) under contract No.2013CB430302，the National High Technology Research and Development Program of China (863 Program) under contract No.2007AA092002，the National Natural Science Foundation of China under contract No.41206170，the public science and technology research funds projects of the ocean under contract No.201005030，scientific research fund of the Second Institute of Oceanography |
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| 摘 要： | Prorocentrum donghaiense is one of the most common red tide causative dinoflagellates in the Changjiang （Yangtze） River Estuary and the adjacent area of the East China Sea. It causes large-scale blooms in late spring and early summer that lead to widespread ecologic and economic damage. A means for distinguish- ing dinoflagellate blooms from diatom （Skeletonema costatum） blooms is desired. On the basis of measure- ments of remote sensing refectance Rrs（λ）] and inherent optical parameters, the potential of using a mul- tispectral approach is assessed for discriminating the algal blooms due to P. donghaiense from those due to S. costatum. The behavior of two reflectance ratios R1 = Rrs（560）/Rrs（532） and Re = Rrs（708）/Rrs（665）], suggests that differentiation of P. donghaiense blooms from diatom bloom types is possible from the current band setup of ocean color sensors. It is found that there are two reflectance ratio regimes that indicate a bloom is dominated by P. donghaiense; （1） R1 〉 1.55 and R2 〈 1.0 or （2） R1 〉 1.75 and R2 ≥ 1.0. Various sensitivity analyses are conducted to investigate the effects of the variation in varying levels of chlorophyll concentration and colored dissolved organic matter （CDOM） as well as changes in the backscattering ratio （bbp/bp） on the efficacy of this muitispectral approach. Results indicate that the intensity and inherent op- tical properties of the algal species explain much of the behavior of the two ratios. Although backscattering influences the amplitude of Rrs（λ）, especially in the 530 and 560 nm bands, the discrimination between P. donghaiense and diatoms is not significantly affected by the variation of bbp/bp. Since aCDOM （440） in coastal areas of the ECS is typically lower than 1.0 m-1 in most situations, the presence of CDOM does not interfere with this discrimination, even as SCDOM varies from 0.01 to 0.026 nm-1. Despite all of these effects, the dis- crimination of P. donghaiense blooms from diatom blooms based on multispectral measurements of Rrs（λ） is feasible.
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| 关 键 词： | 东海原甲藻 光谱反射率 水华 光学检测 有色可溶性有机物 中肋骨条藻 光谱测量 叶绿素浓度 |
| 收稿时间： | 2/1/2013 12:00:00 AM |
| 修稿时间： | 2013/3/29 0:00:00 |
Optical detection of Prorocentrum donghaiense blooms based on multispectral reflectance |
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| TAO Bangyi,PAN Delu,MAO Zhihu,SHEN Yuzhang,ZHU Qiankun,CHEN Jianyu.Optical detection of Prorocentrum donghaiense blooms based on multispectral reflectance[J].Acta Oceanologica Sinica,2013,32(10):48-56. |
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| Authors: | TAO Bangyi PAN Delu MAO Zhihu SHEN Yuzhang ZHU Qiankun and CHEN Jianyu |
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| Institution: | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | Prorocentrum donghaiense is one of the most common red tide causative dinoflagellates in the Changjiang (Yangtze)River Estuary and the adjacent area of the East China Sea.It causes large-scale blooms in late spring and early summer that lead to widespread ecologic and economic damage.A means for distinguishing dinoflagellate blooms from diatom(Skeletonema costatum)blooms is desired.On the basis of measurements of remote sensing reflectanceRrs(λ)]and inherent optical parameters,the potential of using a multispectral approach is assessed for discriminating the algal blooms due to P.donghaiense from those due to S.costatum.The behavior of two reflectance ratiosR1=Rrs(560)/Rrs(532)and R2=Rrs(708)/Rrs(665)], suggests that differentiation of P.donghaiense blooms from diatom bloom types is possible from the current band setup of ocean color sensors.It is found that there are two reflectance ratio regimes that indicate a bloom is dominated by P.donghaiense:(1)R1>1.55 and R2<1.0 or(2)R1>1.75 and R2≥1.0.Various sensitivity analyses are conducted to investigate the effects of the variation in varying levels of chlorophyll concentration and colored dissolved organic matter(CDOM)as well as changes in the backscattering ratio (bbp/bp)on the efficacy of this multispectral approach.Results indicate that the intensity and inherent optical properties of the algal species explain much of the behavior of the two ratios.Although backscattering influences the amplitude of Rrs(λ),especially in the 530 and 560 nm bands,the discrimination between P. donghaiense and diatoms is not significantly affected by the variation of bbp/bp.Since aCDOM(440)in coastal areas of the ECS is typically lower than 1.0 m-1 in most situations,the presence of CDOM does not interfere with this discrimination,even as SCDOM varies from 0.01 to 0.026 nm-1.Despite all of these effects,the discrimination of P.donghaiense blooms from diatom blooms based on multispectral measurements of Rrs(λ) is feasible. |
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| Keywords: | multispectral reflectance harmful algal blooms Prorocentrum donghaiense Skeletonema costatum discrimination |
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