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Effects of ocean Particles on the Upwelling Radiance and Polarized Radiance in the Atmosphere–ocean System

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Advances in Atmospheric Sciences 2015年第9期32卷 1186-1196页

作者： SHI Chong WANG Pucai Teruyuki NAKAJIMA Yoshifumi OTA TAN Saichun SHI Guangyu Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Earth Observation Research Center Japan Aerospace Exploration Agency 2-1-1 Sengen Japan Agency for Marine-Earth Science and Technology State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences

Based on a vector radiative transfer model of the atmosphere–ocean system,the influence of oceanic components on radiation processes,including polarization effects,was investigated in the wavelength region ranging from 0.380 to 0.865 μ*** components considered were phytoplankton,inorganic suspended material（sediment）,and colored,dissolved organic *** to their important roles in oceanic radiation processes,the sensitivity of the bidirectional reflectance to the rough ocean surface,represented by the wind velocity 10 m above the ocean surface,and aerosol,were taken into *** results demonstrated that both radiance and polarized radiance just below the ocean surface were sensitive to the change of the concentrations of the considered components,while the dependence of polarized radiance on the observation geometry was more sensitive than *** differences in the specular plane existed between the impacts of the phytoplankton and sediment on the degree of polarization just above the ocean surface at 670 *** the top of the atmosphere（TOA）,polarization was relatively insensitive to changing concentrations of ocean particles at longer ***,the radiance at the TOA in the solar plane was more sensitive to the aerosol optical thickness than wind *** contrast,wind velocity strongly influenced the radiance at the TOA in the sun glint region,while the polarization degree showed less dependence in that ***,a nonlinear optimal inversion method was proposed to simultaneously retrieve the aerosol and wind velocity using radiance measurement.

关键词： ocean particles atmosphere–ocean system radiative transfer polarization ocean color

Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data

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Acta oceanologica Sinica 2002年第1期21卷 55-65页

作者： MagnusLarson Lennartjnsson South China Sea Institute of oceanology Chinese Academy of Sciences Guangzhou 510301 China Department of Water Resources Engineering Lund University S- 221 00 Lund P.O. Box 118 Sweden

The chlorophyll-a concentration is generally overestimated for the southern China coastalwaters if the default algorithm of the SeaDAS is employed. An algorithm is developed for retrieval of chlorophyll-a concentration in the Zhujiang Estuary, Guangdong Province, China, by using simulated reflectance data. The simulated reflectance is calculated corresponding to the SeaWiFS wavelength bands, via a general model by inputting measured water components, i.e. , the suspended sediment, chlorophyll-a, and yellow substance (DOC) concentration data of 130 samples. Empirical relationships of the chlorophyll-a concentration to 240 different band combinations are investigated based on the simulated reflectance data, and the band combination, R_5R_5/R_3R_4, is found to be the optimum one for the development of an algorithm valid for the Zhujiang Estuary. This algorithm is then employed to determine the chlorophyll-a concentration from SeaWiFS data. The estimated concentrations have a better accuracy than those obtained from the SeaDAS default algorithm when compared with sea truth data. The new algorithm is demonstrated to work well and is used to derive a series of image maps of the chlorophyll-a concentration distribution for the Zhujiang Estuary and adjacent coastal areas.

关键词： Chlorophyll-a ocean color remote sensing algorithm coastal water

Variability in the Light Absorption Coefficient by Phytoplankton,Non-Algal Particles and colored Dissolved Organic Matter in the Northern Gulf of California

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Open Journal of Marine Science 2018年第1期8卷 20-37页

作者： Stella P.Betancur-Turizo Adriana G.González-Silvera Eduardo Santamaría-Del-Angel Roberto Millán-Núnez Eduardo Millán-Núnez Héctor García-Nava Víctor M.Godínez Laura Sánchez-Velasco Facultad de Ciencias Marinas Universidad Autonoma de Baja CaliforniaEnsenadaMéxico Grupo de Investigacion en oceanología Facultad de Oceanografía FísicaEscuela Naval de Cadetes“Almirante Padilla”Barrio BosqueSector ManzanilloCartagena de IndiasColombia Departamento de Ecología Marina CICESEEnsenadaMéxico Instituto de Investigaciones oceanológicas Universidad Autónoma de Baja CaliforniaEnsenadaMéxico Departamento de oceanografía Física CICESEEnsenadaMéxico Departamento de Plancton y Ecología Marina CICIMAR-IPN.Av.Instituto Politécnico Nacional s/nLa PazMéxico

Variability of the optical properties of the northern Gulf of California (México) were analyzed for the first time based on six cruises performed from spring to summer (March to September) between 2008 and 2013. The changes observed in the absorption by three seawater components (phytoplankton, detritus and chromophoric dissolved organic matter or CDOM) were analyzed in relation to changes in bio-optical regions and composition of the phytoplankton community (determined based on phytoplankton pigments). Two regions with unique bio-optical characteristics were identified separated by a narrow transition zone: the Upper Gulf of California (UGC) and Northern Gulf of California (NGC). Despite the temporal changes in their spatial distribution they maintained particular characteristic. UGC is characterized by an average Chla of 1.78 mg/m3, the dominance of microphytoplankton (diatoms and dinoflagellates) and a stronger contribution of detritus to total light absorption. NGC is characterized by an average Chla of 0.7 mg/m3 and the predominance of picophytoplankton, characterized by the dominance of zeaxanthin (marker pigment for cyanobacteria) and/or chlorophyll b (marker pigment for green algae), along with a co-dominium by CDOM and phytoplankton to light absorption. Results indicate that Case II waters can be very different when evaluating the individual contribution by phytoplankton, detritus and CDOM to total light absorption what has to be considered for the selection of bio-optical models for each specific region what can also help to a better definition of the related uncertainties.

关键词： Light Absorption Phytoplankton CDOM Detritus ocean color Gulf of California

Study on the Correlation Between Chlorophyll Maximum and Remote Sensing Data

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Journal of ocean University of China 2006年第3期5卷 213-218页

作者： XIU Peng LIU Yuguang College of Physical and Environmental oceanography Physical Oceanography LaboratoryOcean University of China Qingdao 266003 P. R. China

Based on the in situ optical measurements in the Bohai Sea of China, which belongs to a typical case-2 water area, we studied the characteristics of DCM (deep chlorophyll maximum) such as its spatial distribution, vertical profile, etc. We found that when the depth of the chlorophyll maximum is comparatively small, even in turbid coastal water regions, there is always a good correlation between the concentrations of chlorophyll maximum and the satellite-received signals in blue-green spectral bands; the correlation is even better than that between the surface chlorophyll concentrations and the satellite-received signals. The strong correlation existing even in turbid coastal water regions indicates that an ocean color model to retrieve the concentration of DCM can be constructed for coastal waters if a comprehensive knowledge of the vertical distribution of chlorophyll concentration in the Bohai Sea of China is available.

关键词： ocean color remote sensing model deep chlorophyll maximum case-2 water