Research On The Spatial Variation Characteristics Of Water Color Elements In Liaodong Bay

With the increasing demand for marine monitoring at the current stage,it is imperative to proceed in-depth research on offshore?class water.Since the spatial analysis of past single factors has been unable to meet the needs of production and research,yet comes a rapid development of ocean monitoring by remote sensing,the collaborative observation and spatial analysis are of great significance by the triple elements of water color in the field of remote sensing?chlorophyll;total suspended matter;chromophoric dissolved organic matter?At the same time,the vast majority of remote-sensing monitoring of offshore?class water at the present stage is still using the epistemic observation quantity to invert the statistical model.For the inversion of the?class water elements using the intrinsic optical quantity of the water,most of them are focused on the aspect of suspended matter.The study of phytoplankton is more about measuring the backscattering characteristics of algae in the laboratory.There are few applications,but with the increasing accuracy of quantitative remote sensing,using the intrinsic optical quantity for the inversion of the water color elements will be a vital research direction.This paper aims to find the typical spatial distribution characteristics of the three water color elements in the offshore waters of China Liaodong Bay area also the relationship between the three elements of water color and the backscattering coefficient of water is explored.This article passed through the data on the surface,5m and 10m water depth?two sites have shallow water depth and no data at 10m?at each site of Liaodong Bay water observation voyage 32 stations in April 2015.A total of 94 sets of three elements of water color data,backscattering data,and the corresponding necessary auxiliary parameters were obtained.The method of geostatistics was used to calculate the difference in spatial distribution and calculate the profile difference in typical areas.In this way to analyze the spatial distribution characteristics of the three elements of water color in the Liaodong Bay.At the same time,using the obtained data to analyze the relationship between the backscattering and the total suspended matter concentration,the analysis of the chlorophyll concentration and the backscattering coefficient,the main research results are as follows:?1?The overall distribution of chlorophyll-a concentration is the highest value in the 10m water layer and close to the 10m water layer in the 5m water layer.It gradually weakens upward and the surface layer is the lowest.The overall change range is 0.44¹1.39mg/m³,and the mean value is:3.97 mg/m^3.The northern sea area is higher than the southern sea area,and the eastern sea area is higher than the western sea area.The surface seawater is prone to extreme values,the contours are densely distributed,and the change gradient is relatively large.It is greatly affected by nutrients such as sea runoff.?2?The total suspended matter concentration distribution is still the highest in the 10m water layer,basically the same at 5m and 10m,gradually weakening upwards,the surface layer is the lowest,the overall change range is:1.56⁴9.37mg/L,the mean value is:10.70 mg/L.The northern sea area is still higher than the southern sea area,and the eastern sea area is higher than the western sea area.The concentration of total suspended solids in the surface seawater varies greatly,and the total suspended solids concentration is greatly affected by the coastal runoff and the seawater dynamic environment.?3?The distribution of the absorption coefficient of chromophoric dissolved organic matter is the highest at the 5m water layer and the lowest at the bottom.The overall range of change is:0.103⁰.372 m^-1,with an average of 0.1852 m^-1.The overall distribution and chlorophyll distribution are similar,still lower in the south and west,higher in the north and east.The absorption coefficient at the depth of 5m changes the most and is sensitive to changes in the external environment.The content of colored soluble organic matter in the Liaodong Bay area in spring is influenced by human factors.?4?The relationship between the backscatter coefficient and total suspended matter concentration in Liaodong Bay is not a simple linear relationship but is closer to a cubic relationship.The backscatter fitting trend for different wavelengths is basically the same,R² is above 0.9.At the same time,the concentration of chlorophyll a was reversed using the backscatter coefficient,R² is 0.42 but the consistency coefficient is 0.76,which can provide a theoretical basis for inverting the water color elements with the inherent optical quantity.