Deriving particulate backscattering coefficient at 400 nm from small-scale optically shallow waters using Landsat-8 data: a case study at Luhuitou Peninsula, Sanya

Liu, Yongming1; Xu, Zhantang1,2; Tang, Shilin1,2,3; Zeng, Kai4; Wu, Jie5; Wang, Sufen1,2

2023-08-14

10.1364/OE.494174

OPTICS EXPRESS   Impact Factor & Quartile

1094-4087

The particulate backscattering coefficient (bbp) plays an important role in the growth of coral reefs by influencing the light field conditions. Small-scale optically shallow waters are commonly found in coastal fringing reefs, making it challenging to monitor the spatial and temporal patterns accurately using Aqua satellites with a low spatial resolution. In this study, six existing optimization-based algorithms for deriving bbp at 400 nm (bbp(400)) were evaluated with three simulated Landsat-8 (spatial resolution = 30 m) data sets and in situ data from the Luhuitou Peninsula, Sanya. The comparison results indicated that the HOPE (hyperspectral optimization process exemplar) (Fix-H-error or Fix-H-error-free) algorithm which sets an input value of the water depth alone outperformed other algorithms. However, the estimated bbp(400) from all the algorithms tended to be either overestimated and underestimated due to the improper the spectral shape value of the backscattering coefficient. The HOPE (Fix-H-error) algorithm estimatedbbp(400) from in situ reflectance also had a good correlation with the in situ total suspended particle concentrations data derived-bbp(400), with a correlation coefficient of 0.83. Therefore, the HOPE (Fix-H-error) algorithm was selected to estimate the bbp(400) from satellite-based Landsat-8 data of the Luhuitou Peninsula, Sanya. Time-series (2014-2021) results from these Landsat-8 images reveal the seasonal variation of bbp(400). The bbp(400) was low from May to September every year. From October to December or January, bbp(400) had an increasing trend, and then it decreased until May. Spatial analysis indicated that bbp(400) decreased with increasing water depth. The spatial and temporal patterns of bbp(400) were consistent with in situ observations reported in the literature. This study preliminarily showed the efficiency of an optimization-based algorithm in deriving bbp(400) in small-scale optically shallow water region using Landsat-8 data.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

SCI

English

Others

National Natural Science Foundation of China["41876207","42076190","42206182"] ; Hainan Province Science and Technology Special Fund[ZDYF2020174] ; Guangzhou Science and Technology Plan Project[2023A04J0204]

Optics

Optics

WOS:001061220900003

Optica Publishing Group

PHYSICS

Web of Science

1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China
2.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China
3.Sanya Inst Ocean Ecoenvironm Engn, Sanya 572000, Peoples R China
4.Southern Univ Sci & Technol, Coll Engn, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
5.Natl Univ Def Technol, Coll Meteorol & Oceanog, Changsha 410000, Peoples R China

Liu, Yongming,Xu, Zhantang,Tang, Shilin,et al. Deriving particulate backscattering coefficient at 400 nm from small-scale optically shallow waters using Landsat-8 data: a case study at Luhuitou Peninsula, Sanya[J]. OPTICS EXPRESS,2023,31(17).

Liu, Yongming,Xu, Zhantang,Tang, Shilin,Zeng, Kai,Wu, Jie,&Wang, Sufen.(2023).Deriving particulate backscattering coefficient at 400 nm from small-scale optically shallow waters using Landsat-8 data: a case study at Luhuitou Peninsula, Sanya.OPTICS EXPRESS,31(17).

Liu, Yongming,et al."Deriving particulate backscattering coefficient at 400 nm from small-scale optically shallow waters using Landsat-8 data: a case study at Luhuitou Peninsula, Sanya".OPTICS EXPRESS 31.17(2023).