Simulation of phytoplankton biomass in Quanzhou Bay using a back propagation network model and sensitivity analysis for environmental variables  

作　　者：郑伟 石洪华 宋希坤 黄东仁 胡龙 

机构地区：[1]First Institute of Oceanography,State Oceanic Administration [2]Institute of Oceanography,Chinese Academy of Sciences [3]Monitoring Center of Marine Environment and Fishery Resources of Fujian Province [4]School of Mathematical Sciences,Fudan University

出　　处：《Chinese Journal of Oceanology and Limnology》2012年第5期843-851,共9页中国海洋湖沼学报（英文版）

基　　金：Supported by the Ocean Public Welfare Scientific Research Project,State Oceanic Administration of China(No.200705029);the National Special Fund for Basic Science and Technology of China(No.2012FY112500);the National Non-profit Institute Basic Research Fund(No.FIO2011T06)

摘　　要：Prediction and sensitivity models,to elucidate the response of phytoplankton biomass to environmental factors in Quanzhou Bay,Fujian,China,were developed using a back propagation(BP) network.The environmental indicators of coastal phytoplankton biomass were determined and monitoring data for the bay from 2008 was used to train,test and build a three-layer BP artificial neural network with multi-input and single-output.Ten water quality parameters were used to forecast phytoplankton biomass(measured as chlorophyll-a concentration).Correlation coefficient between biomass values predicted by the model and those observed was 0.964,whilst the average relative error of the network was-3.46% and average absolute error was 10.53%.The model thus has high level of accuracy and is suitable for analysis of the influence of aquatic environmental factors on phytoplankton biomass.A global sensitivity analysis was performed to determine the influence of different environmental indicators on phytoplankton biomass.Indicators were classified according to the sensitivity of response and its risk degree.The results indicate that the parameters most relevant to phytoplankton biomass are estuary-related and include pH,sea surface temperature,sea surface salinity,chemical oxygen demand and ammonium.Prediction and sensitivity models, to elucidate the response of phytoplankton biomass to environmental factors in Quanzhou Bay, Fujian, China, were developed using a back propagation （BP） network. The environmental indicators of coastal phytoplankton biomass were determined and monitoring data for the bay from 2008 was used to train, test and build a three-layer BP artificial neural network with multi-input and single-output. Ten water quality parameters were used to forecast phytoplankton biomass （measured as chlorophyll-a concentration）. Correlation coefficient between biomass values predicted by the model and those observed was 0.964, whilst the average relative error of the network was -3.46% and average absolute error was 10.53%. The model thus has high level of accuracy and is suitable for analysis of the influence of aquatic environmental factors on phytoplankton biomass. A global sensitivity analysis was performed to determine the influence of different environmental indicators on phytoplankton biomass. Indicators were classified according to the sensitivity of response and its risk degree. The results indicate that the parameters most relevant to phytoplankton biomass are estuary-related and include pH, sea surface temperature, sea surface salinity, chemical oxygen demand and ammonium.

关 键 词：SIMULATION phytoplankton biomass Quanzhou Bay back propagation （BP） network global sensitivity analysis 

分 类 号：Q948.8[生物学—植物学]