琼东水体后向散射系数与浮游植物生物量的关系模型*

doi:10.11978/2021123

Abstract

Abstract:

Variability of light backscattering coefficient in the ocean can be used to quantify the biomass of phytoplankton, which can be applied in remote sensing and optical profile observation platforms to obtain the characteristics of phytoplankton biomass spanning various spatio-temporal scales and vertical profiles in the ocean. Significant variabilities of the bio-optical properties exist off the eastern Hainan coast, being influenced by upwelling. Based on the in-situ data collected off this area in 2013, we established a regional algorithm between the backscattering coefficient of particle [b_bp] and chlorophyll a concentration [Chl a]. The algorithm is based on the assumption that the particle backscattering coefficient is determined by the constant background backscattering value independent of Chl a and two components by pico (< 2 μm) and large(>2 μm)phytoplankton. Results show that the modelled b_bp values agree well with measurements, especially for low Chl a concentration. The relationships between b_bp and Chl a vary in different water layers. For example, the constant background backscattering values at the bottom layer are significantly higher than those in the upper layer, indicating that driven by upwelling, the increasing concentration of submicron particles not covariant with Chl a might produce an increasing backscattering coefficient. At the chlorophyll maximum layer, the background backscattering values are significantly lower than those in the upper water, and the contribution percentage of background backscattering value is about 21%~35%. With the increase of Chl a concentration, the contribution of large phytoplankton to b_bp increases significantly, accounting for 50% or higher, while the contribution of pico phytoplankton remains stable around 40%. Understanding the regional relationship of b_bp and Chl a off the eastern Hainan coast can improve our understanding of marine biogeochemical processes in the region.

Key words: Backscattering coefficient of particulate, chlorophyll a concentration, phytoplankton size class, Qiongdong offshore water

CLC Number:

Q948.8

ZHOU Wen, WEI Panpan, LI Cai, WANG Guifen, ZHENG Wendi, DENG Lin, ZHAO Hongwuyi, YU Linghui, CAO Wenxi. Particle backscattering as a function of chlorophyll a concentration off the eastern Hainan coast in the South China Sea^*[J].Journal of Tropical Oceanography, 2022, 41(3): 29-37.

Figures/Tables 6

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References 30

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水层	拟合参数
水层	b_bp,p*(490)/(m²·mg^-1)	b_bp,mn*(490) /(m²·mg^-1)	b_bp,k(490) /(m^-1)
上层水体	0.0015	0.00179	0.001161
表层水体	0.0052	0.00560	0.000894
中层水体	0.0051	0.00543	0.000626
叶绿素最大层	0.0025	0.00288	0.000571
底层水体	0.0563	0.05660	0.006719

Particle backscattering as a function of chlorophyll a concentration off the eastern Hainan coast in the South China Sea^*

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Particle backscattering as a function of chlorophyll a concentration off the eastern Hainan coast in the South China Sea*

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Particle backscattering as a function of chlorophyll a concentration off the eastern Hainan coast in the South China Sea^*