Seasonal and Spatial Controls on the Eutrophication‐Induced Acidification in the Pearl River Estuary

Liang, Bo; Xiu, Peng; Hu, Jiatang; Li, Shiyu

doi:10.1029/2020jc017107

Cited by 6 publications

(3 citation statements)

References 65 publications

(143 reference statements)

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“…As can be seen in Figure 5, unlike for the surface pH T and bottom Ω A , temperature showed a significant linear relationship with pH T , pCO 2 , and Ω A , with all data considered (n = 192), confirming the dominant role of seasonal changes in temperature on these CO 2 parameters (especially the pH T and pCO 2 ). Similar results have been found in other survey sites, such as the Patos Lagoon [61], Gulf of Mexico [62], Aransas Ship Channel [63], East China Sea [64], Northern South China Sea [65], and Pearl River Estuary [66]. Furthermore, based on the above linear relationship (i.e., temperature vs. CO 2 parameters), the seasonal variation in temperature, i.e., 17.9-34.5 • C, can be estimated to explain 11.6% (43.4%), 17.9% (44.4%), and 55.6% (3.3%) of the changes in pH T , pCO 2 , and Ω A of the surface (bottom) waters.…”

Section: Comparison Of Co 2 Parameters With Other Reefs Around the Worldsupporting

confidence: 90%

Seasonal Controls of Seawater CO2 Systems in Subtropical Coral Reefs: A Case Study from the Eastern Coast of Shenzhen, China

Yang,

Zhang,

Xie

et al. 2023

Water

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In situ field investigations coupled with coral culture experiments were carried out in the coral reef waters of the eastern coast of Shenzhen, Da’ao Bay (DAB), Dalu Bay (DLB), and Yangmeikeng Sea Area (YMKSA) to study the dynamics of the carbon dioxide (CO2) system in seawater and its controlling factors. The results indicated that the CO2 parameters were highly variable over a range of spatiotemporal scales, forced by various physical and biochemical processes. Comprehensively, DAB acted as a sink for atmospheric CO2 with exchange flux of –1.51 ± 0.31 to 0.27 ± 0.50 mmol C m−2 d−1, while DLB and YMKSA acted as a CO2 source with exchange fluxes of –0.42 ± 0.36 to 1.69 ± 0.74 mmol C m−2 d−1 and –0.58 ± 0.48 to 1.69 ± 0.41 mmol C m−2 d−1, respectively. The biological process and mixing effect could be the most important factor for the seasonal variation in total alkalinity (TA). In terms of dissolved inorganic carbon (DIC), in addition to biological process and mixing, its seasonal variation was affected by air–sea exchange and coral metabolism to some extent. Different from the former, the other CO2 parameters, total scale pH (pHT), partial pressure of CO2 (pCO2), and aragonite saturation state (ΩA), were mainly controlled by a combination of the temperature change, biochemical processes, air–sea exchange, and coral metabolism, while water mixing has little effect on them. In addition, our results indicated that coral communities could significantly increase the DIC/TA ratio by reducing the TA concentration and increasing the DIC in the reef waters, which may promote the acidification of local seawater and need attention.

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Section: Comparison Of Co 2 Parameters With Other Reefs Around the Worldsupporting

confidence: 90%

Seasonal Controls of Seawater CO2 Systems in Subtropical Coral Reefs: A Case Study from the Eastern Coast of Shenzhen, China

Yang,

Zhang,

Xie

et al. 2023

Water

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“…The rising surface ocean temperatures, freshwater and nutrient inputs, and atmospheric CO 2 will further exacerbate eutrophication-driven acidification and low-oxygen conditions in the PRE (Luo et al, 2014;Zhao et al, 2020;Liang et al, 2021).…”

Section: Future Outlook Of Eutrophicationmentioning

confidence: 99%

A comprehensive approach to assessing eutrophication for the Guangdong coastal waters in China

Zhou,

Wang

2024

Front. Mar. Sci.

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Eutrophication is a global issue associated with increasing anthropogenic activities. Previous studies have mainly focused on nutrients and phytoplankton biomass in some typical estuaries and bays along the Guangdong coast, while integrated evaluations of eutrophication status based on ecological symptoms is still rare in this area. To better understand the health of the Guangdong coastal waters, two comprehensive methods including the Assessment of Estuarine Trophic Status (ASSETS) and the Northwest Pacific Action Plan Common Procedure (NOWPAP CP) were employed with slight modifications. The study area was divided into eight coastal zones (Z1~Z8) based on multiple criteria including salinity, catchment range, and administrative division. The results of the modified NOWPAP CP method demonstrated a generally increasing trend in the degree and effects of nutrient enrichment along the Guangdong coast in the past 30 years mainly due to the increasing nutrients and chlorophyll a (Chl-a). The results of the modified ASSETS method revealed that the water quality was between moderate and high for most coastal zones during 2015-2018, with the highest score (0.83) in the northern part of the Pearl River Estuary (PRE). However, the ecological symptoms showed inconsistent spatial patterns with the water quality, being high or moderate high in Z2 (including Zhanjiang Harbor and Leizhou Bay), Z4~Z5 (representing the northern and southern parts of the PRE, respectively), and Z6 (containing Mirs Bay and Daya Bay) for severe ecological symptoms, such as high levels of Chl-a, frequent harmful algal blooms (HABs). Moreover, eutrophication in Z4~Z6 may further deteriorate due to the increasing nutrient loads driven by growing economy and population. Synthetically, Z2, Z4~Z6 were graded between poor and bad for the overall eutrophication conditions (OEC), while Z1 (including the western and southern parts of the Leizhou Peninsula) and Z7 (consisting of Honghai Bay and Jieshi Bay) had a good OEC. The application of the modified ASSETS method effectively identified areas of severe eutrophication problems and the prospect of nutrient load along the Guangdong coast. The assessment results revealed the spatiotemporal variations and potential trends in the eutrophication status, providing scientific basis for the coastal management related to nutrient problems.

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“…Recently, riverine nitrogen (N) input into estuaries and coastal oceans has increased remarkably during the past decades (Archana et al., 2018; Gruber & Galloway, 2008; Pan et al., 2021; Sharples et al., 2017; Terhaar et al., 2021; Ye et al., 2016; Zheng & Zhai, 2021), which has led to some environmental problems, for example, eutrophication and hypoxia (Yang et al., 2018; Ye et al., 2015). This occurrence is especially serious during rainy seasons with high discharges (Diaz, 2001; Li et al., 2020; Liang et al., 2021). The induced environmental changes would exert an effect on the original functions and biogeochemistry of estuary and costal ecosystems (Moore et al., 2013; Pan et al., 2021; Yan et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Cycling Across a Salinity Gradient From the Pearl River Estuary to Offshore: Insight From Nitrate Dual Isotopes

et al. 2022

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Seasonal and Spatial Controls on the Eutrophication‐Induced Acidification in the Pearl River Estuary

Cited by 6 publications

References 65 publications

Seasonal Controls of Seawater CO2 Systems in Subtropical Coral Reefs: A Case Study from the Eastern Coast of Shenzhen, China

Seasonal Controls of Seawater CO2 Systems in Subtropical Coral Reefs: A Case Study from the Eastern Coast of Shenzhen, China

A comprehensive approach to assessing eutrophication for the Guangdong coastal waters in China

Nitrogen Cycling Across a Salinity Gradient From the Pearl River Estuary to Offshore: Insight From Nitrate Dual Isotopes

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