Variability of scattering and backscattering of marine particles in relation to particle concentration, size distribution, and composition off the eastern hainan coast in the south China sea

Zhou, Wen; Cao, Wenxi; Zhao, Jun; Wang, Guifen; Zheng, Wendi; Deng, Lin; Cai, Li

doi:10.1016/j.csr.2021.104615

Cited by 5 publications

(1 citation statement)

References 79 publications

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“…For example, riverine flocs are enriched in terrigenous organic matter compared to marine resuspension flocs (Li et al, 2018). The benthic nepheloid layer is enriched in inorganic mineral components, in contrast to the phytoplankton-dominated upper water layers in the eastern Hainan coast of the South China Sea (Zhou et al, 2022). Similarly, the study of the northern Yellow Sea cold water mass showed a low organic component in the lower nepheloid layer.…”

Section: The Complexity Sources Of Spm From Seawater and Freshwatermentioning

confidence: 99%

Vertical distribution of suspended particulate matter and its response to river discharge and seawater intrusion: a case study in the Pearl River Estuary during the 2020 dry season

Deng,

Hu,

Chen

et al. 2023

Front. Mar. Sci.

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The vertical distribution of suspended particulate matter (SPM) in the Pearl River Estuary (PRE) during winter has not been widely reported. The aim of this paper is to describe the high-resolution vertical distribution of SPM along the transect based on the in-situ observations (including SPM, attenuation coefficient, and particle backscattering coefficient) from three transects of the winter cruise in the northern South China Sea in 2020. The empirical relationship between SPM and bio-optical parameters with correlation coefficients greater than 0.7 is also established and combined with model data to further discuss the mechanism of river discharge and seawater intrusion effects on the vertical distribution of SPM. In the horizontal distribution, the mass concentration of SPM was high in the nearshore region and was low in the offshore region. In the vertical direction, the mass concentration of SPM in the offshore region was more homogeneous, while the mass concentration of SPM in the nearshore region varied greatly, showing a pattern of high bottom and middle layer or high bottom and surface layer. The difference in the vertical distribution of SPM in the nearshore area is the combined effect of river discharge and seawater intrusion on the resuspension of sediment and the inhibition of the spread of high SPM.

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Section: The Complexity Sources Of Spm From Seawater and Freshwatermentioning

confidence: 99%

Vertical distribution of suspended particulate matter and its response to river discharge and seawater intrusion: a case study in the Pearl River Estuary during the 2020 dry season

Deng,

Hu,

Chen

et al. 2023

Front. Mar. Sci.

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Biological controls on marine volatile organic compound emissions: A balancing act at the sea-air interface

Halsey

Giovannoni

2023

Earth-Science Reviews

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Satellite estimation of suspended particle types using a backscattering efficiency-based model in the marginal seas

Wang

Sun³

et al. 2023

Opt. Express

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The particle composition of suspended matter provides crucial information for a deeper understanding of marine biogeochemical processes and environmental changes. Particulate backscattering efficiency (Qbbe(λ)) is critical to understand particle composition, and a Qbbe(λ)-based model for classifying particle types was proposed. In this study, we evaluated the applicability of the Qbbe(λ)-based model to satellite observations in the shallow marginal Bohai and Yellow Seas. Spatiotemporal variations of the particle types and their potential driving factors were studied. The results showed that the Qbbe(λ) products generated from Moderate Resolution Imaging Spectroradiometer (MODIS) on the satellite Aqua agreed well with the in situ measured values, with determination coefficient, root mean square error, bias, and mean absolute percentage error of 0.76, 0.007, 16.5%, and 31.0%, respectively. This result verifies the satellite applicability of the Qbbe(λ)-based model. Based on long-term MODIS data, we observed evident spatiotemporal variations of the Qbbe(λ), from which distinct particle types were identified. Coastal waters were often dominated by minerals, with high Qbbe(λ) values, though their temporal changes were also observed. In contrast, waters in the offshore regions showed clear changes in particle types, which shifted from organic-dominated with low Qbbe(λ) levels in summer to mineral-dominated with high Qbbe(λ) values in winter. We also observed long-term increasing and decreasing trends in Qbbe(λ) in some regions, indicating a relative increase in the proportions of mineral and organic particles in the past decades, respectively. These spatiotemporal variations of Qbbe(λ) and particle types were probably attributed to sediment re-suspension related to water mixing driven by wind and tidal forcing, and to sediment load associated with river discharge. Overall, the findings of this study may provide valuable proxies for better studying marine biogeochemical processes, material exchanges, and sediment flux.

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Variability of scattering and backscattering of marine particles in relation to particle concentration, size distribution, and composition off the eastern hainan coast in the south China sea

Cited by 5 publications

References 79 publications

Vertical distribution of suspended particulate matter and its response to river discharge and seawater intrusion: a case study in the Pearl River Estuary during the 2020 dry season

Vertical distribution of suspended particulate matter and its response to river discharge and seawater intrusion: a case study in the Pearl River Estuary during the 2020 dry season

Biological controls on marine volatile organic compound emissions: A balancing act at the sea-air interface

Satellite estimation of suspended particle types using a backscattering efficiency-based model in the marginal seas

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