A bio-optical inversion model to retrieve absorption contributions and phytoplankton size structure from total minus water spectral absorption using genetic algorithm

We propose a bio-optical inversion model that retrieves the absorption contributions of phytoplankton and colored detrital matter （CDM）, as well as the phytoplankton size classes （PSCs）, from total minus water absorption spectra. The model is based on three-component separation of phytoplankton size...

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Bibliographic Details
Published in:Chinese journal of oceanology and limnology 2013-09, Vol.31 (5), p.970-978
Main Author: 林俊芳 曹文熙 周雯 胡水波 王桂芬 孙兆华 许占堂 宋庆君
Format: Article
Language:English
Subjects:
Absorption
Absorption spectra
Algorithms
Biogeochemistry
Biology
Chlorophyll
Chlorophylls
Colour
data collection
Datasets
Earth and Environmental Science
Earth Sciences
Genetic algorithms
Inversion
Marine
model validation
Oceanography
Phytoplankton
Plankton
Root-mean-square errors
Seawater
Spectra
Water absorption
反演模型
吸收光谱
大小结构
检索
水下
浮游植物
生物光学
遗传算法
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Summary:We propose a bio-optical inversion model that retrieves the absorption contributions of phytoplankton and colored detrital matter （CDM）, as well as the phytoplankton size classes （PSCs）, from total minus water absorption spectra. The model is based on three-component separation of phytoplankton size structure and a genetic algorithm. The model performance was tested on two independent datasets （the NASA bio-Optical Marine Algorithm Dataset （NOMAD） and the northern South China Sea （NSCS） dataset）. The relationships between the estimated and measured values were strongly linear, especially for aCDM（412）, and the Root Mean Square Error （RMSE） of the CDM exponential slope （ScDM） was relatively low. Next, the inversion model was directly applied to in-situ total minus water absorption spectra determined by an underwater meter during a cruise in September 2008, to retrieve the phytoplankton size structure in the seawater. By comparing the measured and retrieved chlorophyll a concentrations, we demonstrated that total and size-specific chlorophyll a concentrations could be retrieved by the model with relatively high accuracy. Finally, we applied the bio-optical inversion model to investigate changes in phytoplankton size structure induced by an anti-cyclonic eddy in the NSCS.
ISSN:0254-4059
2096-5508
1993-5005
2523-3521
DOI:10.1007/s00343-013-2330-9