Relationships of particulate backscattering with particulate organic carbon and phytoplankton carbon in the oligotrophic South China Sea basin

Posted on 03.05.2021 - 13:49
Particulate backscattering coefficient (bbp) provides effective proxies for particulate organic carbon (POC) and phytoplankton carbon (Cphy); however, their bio-optical relationships in the oligotrophic ocean are rarely reported. In this work, based on the in-situ synchronous optical and biogeochemical measurements in the oligotrophic South China Sea (SCS) basin, we refined the regional relationships between POC (and Cphy) and bbp, and investigated the impacts of phytoplankton community compositions and size classes on the bbp variability. The observations showed that: 1) POC and Cphy exhibited good linear relationships with bbp; 2) the relationship between Cphy and POC could also be fitted in a linear function with a positive POC intercept, and the POC contributed by phytoplankton-related non-algal particles was nearly two folds of Cphy; and 3) the POC-specific bbp (b*bp) was positively correlated with the fraction of the phytoplankton groups Haptophytes (Type 8) and Diatoms to total Chla, but negatively correlated with the fraction of pico-phytoplankton to Chla (fpico); these findings suggest that in oligotrophic waters, the variability of b*bp was mainly determined by the large phytoplankton with complex structures.

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Qiu, Guoqiang; Xing, Xiaogang; Boss, Emmanuel; Yan, Xiao-Hai; Ren, Rui; Xiao, Wupeng; et al. (2021): Relationships of particulate backscattering with particulate organic carbon and phytoplankton carbon in the oligotrophic South China Sea basin. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5401545.v2
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AUTHORS (7)

Guoqiang Qiu
Xiaogang Xing
Emmanuel Boss
Xiao-Hai Yan
Rui Ren
Wupeng Xiao
Haili Wang

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