Satellite Remotely-sensed Analysis of Temporal-spatial Variations of Chlorophyll-a Concentration in South China Sea

摘要

Taking the South China Sea as the study area, the present paper aims to obtain the spatial and temporal distributions of chlorophyll-a, based on the chlorophyll-a data remote sensed by SeaWiFS from September 1997 to December 2010. Calculate the monthly average of chlorophyll-a concentration through space superposition and analysis the distribution characteristics. In consideration of space regional characteristics of chlorophyll-a concentration in the research area, divide the research area into three zones used the spatial clustering method based on grid density and discuss the seasonal variation in each zone. In order to quantitatively express spatial distribution characteristics of chlorophyll-a concentration, a sinusoidal curve model is established using MATLAB to fit the time series in these zones for simulating the change trends, variation periods and fluctuation ranges of chlorophyll-a.