珠江口夏季海陆源有机碳的模拟研究——分布特征、贡献比重及其迁移转化过程

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Abstract

Based on a well-validated three-dimensional hydrodynamic-water quality model, this paper isolated marine and terrestrial organic carbon during summer in the Pearl River Estuary (PRE) to investigate their spatial patterns, relative contributions, and associated fluxes. Results showed a gradually decreasing (increasing) trend of terrestrial (marine) organic carbon from the river outlets to the continental shelf with a mean concentration of 1.45mg/L(0.97mg/L) and 0.87mg/L (1.05mg/L) at the surface and bottom water, respectively. In stratified regions, the concentrations of terrestrial (marine) organic carbon decreased rapidly (increased slowly) with depth, whereas in non-stratified regions the marine and terrestrial organic carbon were both well mixed in the whole water column. The relative contribution of marine organic carbon increased gradually from 4.43% at the inner Lingdingyang Bay to 81.20% at the east of outer Lingdingyang Bay and was lower at the surface than the bottom water with a vertical integrated contribution being 48.26%. The hydrodynamic conditions in the PRE was complicated. Under the effects of river runoff, tides, and monsoon, terrestrial organic carbon was transported offshore with a gradual decrease in its transport fluxes. However, the transport fluxes of marine organic carbon have a large heterogeneity in their spatial patterns. Specifically, marine organic carbon was transported offshore with a gradual increase in its transport fluxes along the pathway at the southwest of the PRE and in contrast was transported onshore with a gradual decrease in fluxes at the northwest. The biochemical reactivity of terrestrial organic carbon was relatively weak, and thus only a small fraction was consumed through the biochemical processes, leading to a dominant role of sedimentation in the migration and transformation of terrestrial organic carbon. Marine organic carbon was mainly controlled by the physical transport near the river outlets and the biochemical consumption at the continental shelf. In addition, the sedimentation effect of marine organic carbon was less profound and the biochemical effect was significantly more important when compared to terrestrial organic carbon.

Key words： Pearl River Estuary marine and terrestrial organic carbon distribution characteristics contribution rate flux processes numerical simulation

Received: 15 May 2019

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X52

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	LIU Guang-zhou
	HU Jia-tang
	LI Shi-yu

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LIU Guang-zhou,HU Jia-tang,LI Shi-yu. Simulation of marine and terrestrial organic carbon in the Pearl River Estuary in summer——distribution characteristics, contribution rate and migration and transformation processes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 162-173.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I1/162

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