The biogeochemistry of inorganic carbon and nutrients in the Pearl River estuary and the adjacent Northern South China Sea

Cai, Wei‐Jun; Dai, Minhan; Wang, Yongchen; Zhai, Weidong; Huang, Tao; Shui-tu, Chen; Zhang, Fan; Chen, Zhaozhang; Wang, Zhaohui

doi:10.1016/j.csr.2004.04.005

Cited by 334 publications

(200 citation statements)

References 44 publications

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“…7.6), whereas such overall removal is apparent in the Mississippi plume (Fig. 7.5) (Cai 2003;Guo et al 2012;Huang et al 2012), in the Pearl River plume (Cai et al 2004;Dai et al 2008), and the Changjiang plume (Wang et al 2000;Chou et al 2009b).…”

Section: Co 2 In the Amazon River Plumementioning

confidence: 93%

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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Section: Co 2 In the Amazon River Plumementioning

confidence: 93%

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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“…The river carries heavy pollution loads and high nutrient inputs into the western Hong Kong waters (Cai et al, 2004;Yin et al, 2004). In addition, Hong Kong waters receive >2 million tons of sewage effluent daily from the local sewage discharge in Victoria Harbor.…”

Section: Study Area and Samplingmentioning

confidence: 99%

“…Coupled with the monsoonal influence, the seasonal freshwater discharge from the Pearl River further complicates the hydrodynamics and biochemical processes. Previous studies suggested that the anthropogenic inputs of nutrients and organic matter in the Pearl River estuary have led to a decrease in oxygen and an increase in CO 2 , especially in the upper estuary (Yin et al, 2004;Cai et al, 2004;Dai et al, 2006). Zhai et al (2005a) have reported that aerobic respiration is the most important process in maintaining a high pCO 2 level (>3000 µatm) in the upstream section of the Pearl River estuary.…”

mentioning

confidence: 99%

Influence of seasonal monsoons on net community production and CO<sub>2</sub> in subtropical Hong Kong coastal waters

et al. 2011

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Abstract. Data from seven cruises in three different environments including the Pearl River estuary, sewage discharge outfall, and eastern coastal/shelf waters were used to examine the seasonal variations in net community production (NCP) and the biologically active gases O 2 and CO 2 . In the winter dry season, when monsoon-induced downwelling was dominant, NCP was negative (−84 ± 50 mmol C m −2 d −1 ) in all three regions. The negative NCP corresponded to O 2 influxes of 100 ± 50 mmol O 2 m −2 d −1 and CO 2 effluxes of 24 ± 10 mmol C m −2 d −1 . In the summer wet season, when upwelling brought the deep oceanic waters to the coast due to the southwest monsoonal winds, there was a 2 to 15-fold increase in integrated primary production (IPP) compared to winter. The increase in IPP was likely due to the favorable conditions such as stratification and the nutrient inputs from upwelled waters and the Pearl River estuary. NCP in the mixed layer reached up to 110 ± 48 mmol C m −2 d −1 in the wet season. However, accompanying the high positive NCP, we observed an O 2 influx of 100 ± 60 mmol O 2 m −2 d −1 and CO 2 efflux of 21 ± 15 mmol C m −2 d −1 . The contradictory observation of positive NCP and CO 2 release and O 2 uptake in the mixed layer could be explained by the influence of the southwest monsoon-induced upwelling along with the influence of the Pearl River, as the upwelling brought cold, low dissolved oxygen (DO, 160 ± 30 µM) and high dissolved inorganic carbon (DIC, 1960 ± 100 µatm) water to the surface in the wet season. Hence, the subtropical Hong KongCorrespondence to: K. Yin (yinkd@mail.sysu.edu.cn) coastal waters are generally a CO 2 source due to the monsoonal influence during both the dry-heterotrophic and wetautotrophic seasons.

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“…The changes of river water discharge are mostly related to rainfall in this region [33]. During the wet season, the discharge of the Pearl River accounts for 80% of the yearly total [30], and the discharges of major tributaries (West River, North River, and East River) are much higher than those in dry season [48]. As the increase of rainfall and river flow from upstream, a large number of pollutants from farmland and street were carried into rivers.…”

Section: Water Quality Variation and Correlation Of Water Quality Parmentioning

confidence: 99%

Water Quality Management Based on Division of Dry and Wet Seasons in Pearl River Delta, China

Fan

Cui

Zhang

et al. 2012

CLEAN Soil Air Water

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In the Pearl River Delta (PRD), river water quality deteriorates continually due to the population increase and ongoing industrialization and urbanization. In this study, a water quality management paradigm based on the seasonal variation is proposed. For better exploring the seasonal change of water quality, wavelet analysis was used to analyze the division of dry and wet seasons in the PRD during 1952PRD during -2009. Then water quality seasonal variation in 2008 and relevant impact factors were analyzed by multivariate statistic methods as a case to make some management measures. The results show that there are some differences of dry and wet seasons division among different years. Wet season mainly appear from April to September, which occupy the largest proportion among the 58 years (about 70%) and then followed by the wet season from May to October (about 13.8% of the total years). As to the water quality of 2008, significant differences exist between dry and wet seasons for 17 water quality parameters except TP, NO À 3 , Fe 2þ , and Zn 2þ . Levels of parameters pH, EC, COD Mn , BOD 5 , NH þ 4 , SO 2À 4 , and Cl À in dry season are much higher than those in wet season. In dry season the variations of river water quality are mainly influenced by domestic sewage, industrial effluents, and salt water intrusion. While in wet season, except the aforementioned pollution sources, drainages from cultivated land and livestock farm are also the main factors influencing water pollution. Thus, water quality management measures are proposed in dry and wet seasons, respectively. The results obtained from this study would further facilitate water quality protection and water resources management in the PRD.

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The biogeochemistry of inorganic carbon and nutrients in the Pearl River estuary and the adjacent Northern South China Sea

Cited by 334 publications

References 44 publications

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Influence of seasonal monsoons on net community production and CO<sub>2</sub> in subtropical Hong Kong coastal waters

Water Quality Management Based on Division of Dry and Wet Seasons in Pearl River Delta, China

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The biogeochemistry of inorganic carbon and nutrients in the Pearl River estuary and the adjacent Northern South China Sea

Cited by 334 publications

References 44 publications

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Influence of seasonal monsoons on net community production and CO&lt;sub&gt;2&lt;/sub&gt; in subtropical Hong Kong coastal waters

Water Quality Management Based on Division of Dry and Wet Seasons in Pearl River Delta, China

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Influence of seasonal monsoons on net community production and CO<sub>2</sub> in subtropical Hong Kong coastal waters