Fig. 1. The map of Jiaozhou Bay and Qingdao coastal experiment stations

Fig. 2. The scattering coefficient spectrum of the field experiments in 2014 and 2015 (a) and the backscattering coefficient spectrum of the field experiment in 2015 (b)
The red dotted lines indicate the stations in Jiaozhou Bay (JZ*) and blue dotted lines indicate the stations in Qingdao offshore (QD*)

Fig. 3. The models for the relationship between backscattering coefficient and scattering coefficient at 532 nm

Fig. 4. The particle refractive index n_p of each station in Jiaozhou Bay and Qingdao coast
The abscissa indicates the station position, and from left to right the stations are JZ1—9, QD1—7

Fig. 5. The vertical distribution of particle refractive index in 2014 and 2015

Fig. 6. The relationship between backscattering coefficient at 532 nm and SPM concentration