渤海海区颗粒物的后向散射系数和光束散射系数统计关系研究  

The Statistical Relation on Backscattering Coefficient and Beam Scattering Coefficients in the Bohai Sea

作　　者：顾艳镇[1] 刘玉光[1] 刘亚豪[1] 马玉娟[1] 殷晓斌[2] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100 [2]中国科学院空间科学与应用研究中心,北京100080

出　　处：《中国海洋大学学报（自然科学版）》2007年第S2期1-7,共7页Periodical of Ocean University of China

基　　金：973-2007CB411807;863-2006AA09Z140

摘　　要：作者利用AC9和HS6(442 nm4、88 nm、532 nm、676 nm)在渤海海域的测量数据,通过分析其中3个波段的数据发现:海水所含颗粒的后向散射系数和光束散射系数之间具有很强的相关性。二者的关系可用2种不同的函数模型描述:在黄河口外海断面可用二次多项式模型描述;而在渤海湾、辽东湾和秦皇岛断面可用幂函数模型描述。将HS6在对应波段实际测量的后向散射系数与反演值进行比较可以发现,上述2个函数模型的反演值与实测值都有很好的相关性(分别为85%和96%),平均相对误差较小(分别为24%和18%),均方根误差分别为0.013和0.055。这表明上述函数模型作为反演模式在对应海域可用。因此,通过AC9的测量数据进行计算获得颗粒的后向散射系数,可增加后向散射系数的数据量,这对于推动水色遥感分析模型的发展具有重要意义。后向散射系数和光束散射系数之间函数模型随海域的不同而不同的可能原因是:(1)在无机悬浮物含量比较高的海域,无机悬浮物的颗粒形状确定后向散射系数和光束散射系数之间函数关系;(2)在无机悬浮物含量比较低的海域,优势藻类细胞形状对后向散射系数和光束散射系数之间的函数关系有更重要的影响。Base on the data of AC9 and HS6 at the spectral bands of 442 nm、488 nm、532 nm、676 nm,statistical relations in the Bohai sea between beam scattering coefficient bp(λ) and backscattering coefficient bbp(λ) are obtained.The author find there is high correlation between the beam scattering coefficient bp(λ) and the backscattering coefficient bbp(λ) for particulates.Regression analysis shows that there are two distinct trends between bbp(λ) and bp(λ).In the cross sections of HHK,statistical relation between bbp(λ) and bp(λ) can be described by a polynomial function;in the cross sections of BHW,LDW and QHD,statistical relation between bbp(λ) and bp(λ) can be described by a power function.Thus this statistical relation can be used to retrieve the backscattering coefficient from the beam scattering coefficient measured by AC9.By comparing the backscattering coefficient measured by HS6 and those retrieved from beam scattering coefficient measured by AC9 using the statistical relation at the residual wave band,we found that the correlative coefficients(R2) between the retrieval data and the in-situ data are 0.97 and 0.96,the average relative errors are 22% and 18%,the root mean square(RMS) errors are 0.031 and 0.055,respectively for two cases.The results indicate the statistical relation between bbp(λ) and bp(λ) proposed by this study is usable.Therefore,the backscattering coefficient can be obtained from the AC9 measured data.This is significant for development of the ocean color remote sensing analysis model.The reasons that the statistical relation between bbp(λ) and bp(λ) is different along with the sea areas are:(1) The content of inorganic suspended matter determines the relationship between bbp(λ) and bp(λ) when inorganic suspended matter is higher;(2) When the inorganic suspended matter is lower,the shape of superiority algae has more effect on the relationship between bbp(λ) and bp(λ).

关 键 词：渤海 固有光学量 光束散射系数 后向散射系数 

分 类 号：P733.3[天文地球—物理海洋学]