Sources and dynamics of dissolved black carbon in the Pearl River Estuary and Shelf, Northern South China Sea

IF 1.3 4区 地球科学 Q4 OCEANOGRAPHY
Qinghua Zhang, Junfei Zhou, Ziming Fang, Weifeng Yang, Min Chen, Minfang Zheng
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引用次数: 0

Abstract

Estuarine processes regulate the transport of dissolved black carbon (DBC) and associated contaminants to the ocean. However, there is limited understanding of the geochemical behavior of DBC in estuaries. In this study, DBC in the Pearl River Estuary (PRE) and the northern shelf of the South China Sea were examined using the benzene polycarboxylic acid (BPCA) method. DBC, bulk dissolved organic carbon (DOC), and chromophoric dissolved organic matter (CDOM) exhibited distinct behaviors during their transport from the PRE to the sea. DOC and CDOM decreased during the initial mixing of river water and seawater but increased at the lower PRE. In contrast, high aromaticity DBC inputs were observed throughout the PRE, likely originating from local terrestrial sources, such as runoff from nearby islands, as indicated by the high RH/L values (i.e., the ratio of BPCA containing 5 and 6 carboxyl groups to that containing 3 and 4 carboxyl groups; 2.03–2.30). In the Pearl River-plume zone (salinity < 33.0), DOC, CDOM, and DBC showed quasi-conservative behaviors against salinity, indicating that their geochemical behaviors were primarily governed by physical mixing between plume water and seawater. Using a flux model, it was estimated that the discharge of riverine DBC from the Pearl River Delta ranged from 11.2 to 16.3 Gg year−1, representing an important source of bio-resistant DOC to the northern South China Sea.

Abstract Image

南海北部珠江口及陆架溶解黑碳的来源及动态
河口过程调节溶解的黑碳(DBC)和相关污染物向海洋的运输。然而,人们对河口DBC的地球化学行为了解有限。本研究采用苯聚羧酸(BPCA)方法对珠江口和南海北部陆架的DBC进行了研究。DBC、大块溶解有机碳(bulk dissolved organic carbon, DOC)和显色性溶解有机物(chroophic dissolved有机质,CDOM)在PRE - sea的迁移过程中表现出不同的行为。DOC和CDOM在河水与海水混合初期呈下降趋势,在PRE较低时呈上升趋势。相比之下,整个PRE都观察到高芳香性DBC输入,可能来自当地陆地来源,例如附近岛屿的径流,这表明高RH/L值(即含有5和6个羧基的BPCA与含有3和4个羧基的BPCA的比例);2.03 - -2.30)。在珠江-柱状带(盐度< 33.0), DOC、CDOM和DBC对盐度表现出准保守行为,表明它们的地球化学行为主要受柱状水与海水的物理混合支配。利用通量模型估计,珠江三角洲沿岸DBC的排放量在11.2 ~ 16.3 Gg /年−1之间,是南海北部生物抗性DOC的重要来源。
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来源期刊
Journal of Oceanography
Journal of Oceanography 地学-海洋学
CiteScore
3.50
自引率
13.00%
发文量
42
审稿时长
6-12 weeks
期刊介绍: The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.
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