基于GOCI数据的胶州湾水体透明度遥感反演及日变化研究

周燕, 禹定峰, 刘晓燕, 杨倩, 盖颖颖

Research on remote sensing retrieval and diurnal variation of Secchi disk depth of Jiaozhou Bay based on GOCI

ZHOU Yan, YU Dingfeng, LIU Xiaoyan, YANG Qian, GAI Yingying

表1 QAA_V6模型计算流程

Tab.1 Steps of QAA_V6 to obtain absorption coefficient and scattering coefficient from remote sensing reflectance

步骤	物理量	计算公式
1	r_rs(λ)	r_rs(λ)=R_rs(λ)/(0.52+1.7R(λ))
2	u(λ)	$u (λ) = \frac{- g_{0} + \sqrt[]{(g_{0})^{2} + 4 g_{1} r_{rs} (λ)}}{2 g_{1}}$ ,g₀=0.089, g₁=0.125
		R_rs(670)<0.001 5sr^-1 (QAA_V5)	R_rs(670)≥0.001 5sr^-1 (QAA_V6)
3	a(λ₀)	a(λ₀)=a(55x)=a_w(λ₀)+ $10^{h_{0} + h_{1} χ + h_{2} χ^{2}}$ h₀=-1.146, h₁=-1.366, h₂=-0.469 $χ = \lg [\frac{r_{rs} (443) + r (490)}{r_{rs} (55 x) + 5 \frac{r_{rs} (670)}{r_{rs} (490)} r_{rs} (670)}]$	$\begin{array}{l} = a (670) \\ = a_{w} (670) + 0.39 {[\frac{R_{rs} (670)}{R_{rs} (443) + R_{rs} (490)}]}^{1.14} \end{array}$
4	b_bp(λ₀)	b_bp(λ₀)=b_bp(55x)= $\frac{u (λ_{0}) - a (λ_{0})}{1 - u (λ_{0})}$ -b_bw(55x)	b_bp(λ₀)=b_bp(670)= $\frac{u (λ_{0}) - a (λ_{0})}{1 - u (λ_{0})}$ -b_bw(670)
5	η	$η = 2.0 [1 - 1.2 \exp (- 0.9 \frac{r_{rs} (443)}{r_{rs} (55 x)})]$
6	b_bp(λ)	b_bp(λ)=b_bp(λ₀) ${(\frac{λ_{0}}{λ})}^{η}$
7	a(λ)	a(λ)=[1-u(λ)][b_bw(λ)+b_bp(λ)]/u(λ)