珠江口水体有机碳的季节性变化

doi:10.11978/2015109

Abstract

Abstract: Seasonal distributions of particulate organic carbon (POC) and dissolved organic carbon (DOC) concentrations, as well as their sources, transports and mixing behaviors, in the Pearl River estuary (PRE) are reported in this paper. Samples were collected in November 2013, and in February, May and August 2014. The results suggest that the sources of POC were mainly in situ aquatic phytoplankton, and the source of DOC was mainly input from terrigenous organic carbon. However, aquatic phytoplankton might have contributed less to POC in May than in other months due to intensified erosion by high rainfall during May, and terrigenous organic carbon contribution to DOC increased in August. DOC was always the main portion, i.e., higher than POC, in the total organic carbon. The conservative mixing process of riverine and marine organic carbon occurred from the low salinity zone (salinity of 1‰~5‰) near the Humen Outlet to the open sea area out of the PRE. Biological degradation may have played an important role in reducing POC and DOC concentrations in the upper reach of the Humen Outlet. Preferential consumption of fresh phytoplankton organic carbon, reduction of phytoplankton production, and flocculation and sinking of particulate matter might have collectively resulted in the much more reduction of POC than DOC in the upper reach.

Key words: Particulate organic carbon, dissolved organic carbon, mixing behavior, seasonal, Pear River estuary

CLC Number:

P734.4⁺3

GUO Wei, YE Feng, LIAN Zhonglian, JIA Guodong. Seasonal changes of organic carbon in the Pearl River estuary[J].Journal of Tropical Oceanography, 2016, 35(4): 40-50.

References

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Seasonal changes of organic carbon in the Pearl River estuary

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