Coastal Acidification Induced by Tidal-Driven Submarine Groundwater Discharge in a Coastal Coral Reef System

2014 ◽  
Vol 48 (22) ◽  
pp. 13069-13075 ◽  
Author(s):  
Guizhi Wang ◽  
Wenping Jing ◽  
Shuling Wang ◽  
Yi Xu ◽  
Zhangyong Wang ◽  
...  
Keyword(s):  
Coral Reef ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Reef System ◽  
Submarine Groundwater ◽  
Coastal Acidification ◽  
Coral Reef System

scholarly journals Offshore Submarine Groundwater Discharge at a Coral Reef Front Controlled by Faults

2019 ◽  
Vol 20 (7) ◽  
pp. 3170-3185 ◽  
Author(s):  
Danica Linda M. Cantarero ◽  
Ariel Blanco ◽  
M. Bayani Cardenas ◽  
Kazuo Nadaoka ◽  
Fernando P. Siringan
Keyword(s):  
Coral Reef ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Submarine Groundwater

scholarly journals Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

2018 ◽  
Vol 15 (4) ◽  
pp. 997-1009 ◽  
Author(s):  
Guizhi Wang ◽  
Shuling Wang ◽  
Zhangyong Wang ◽  
Wenping Jing ◽  
Yi Xu ◽  
...  
Keyword(s):  
Coral Reef ◽  
Water Column ◽  
Water Depth ◽  
Neap Tide ◽  
Groundwater Discharge ◽  
Spring Tide ◽  
Biological Processes ◽  
Reef System ◽  
Nitrite Nitrate ◽  
Coral Reef System

Abstract. To investigate variation in nitrite, nitrate, phosphate, and silicate in a spring–neap tide in a coral reef system influenced by groundwater discharge, we carried out a time-series observation of these nutrients and 228Ra, a tracer of groundwater discharge, in the Luhuitou fringing reef at Sanya Bay in the South China Sea. The maximum 228Ra, 45.3 dpm 100 L−1, appeared at low tide and the minimum, 14.0 dpm 100 L−1, appeared during a flood tide in the spring tide. The activity of 228Ra was significantly correlated with water depth and salinity in the spring–neap tide, reflecting the tidal-pumping feature of groundwater discharge. Concentrations of all nutrients exhibited strong diurnal variation, with a maximum in the amplitude of the diel change for nitrite, nitrate, phosphate, and silicate in the spring tide of 0.46, 1.54, 0.12, and 2.68 µM, respectively. Nitrate and phosphate were negatively correlated with water depth during the spring tide but showed no correlation during the neap tide. Nitrite was positively correlated with water depth in the spring and neap tide due to mixing of nitrite-depleted groundwater and nitrite-rich offshore seawater. They were also significantly correlated with salinity (R2  ≥  0.9 and P < 0.05) at the ebb flow of the spring tide, negative for nitrate and phosphate and positive for nitrite, indicating the mixing of nitrite-depleted, nitrate- and phosphate-rich less saline groundwater and nitrite-rich, nitrate- and phosphate-depleted saline offshore seawater. We quantified variation in oxidized nitrogen (NOx) and phosphate contributed by biological processes based on deviations from mixing lines of these nutrients. During both the spring and neap tide biologically contributed NOx and phosphate were significantly correlated with regression slopes of 4.60 (R2  =  0.16) in the spring tide and 13.4 (R2  =  0.75) in the neap tide, similar to the composition of these nutrients in the water column, 5.43 (R2  =  0.27) and 14.2 (R2  =  0.76), respectively. This similarity indicates that the composition of nutrients in the water column of the reef system was closely related with biological processes during both tidal periods, but the biological influence appeared to be less dominant, as inferred from the less significant correlations (R2  =  0.16) during the spring tide when groundwater discharge was more prominent. Thus, the variability of nutrients in the coral reef system was regulated mainly by biological uptake and release in a spring–neap tide and impacted by mixing of tidally driven groundwater and offshore seawater during spring tide.

scholarly journals Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

2017 ◽  
Author(s):  
Guizhi Wang ◽  
Shuling Wang ◽  
Zhangyong Wang ◽  
Yi Xu ◽  
Zhouling Zhang ◽  
...  
Keyword(s):  
Coral Reef ◽  
Water Column ◽  
Water Depth ◽  
Neap Tide ◽  
Groundwater Discharge ◽  
Spring Tide ◽  
Biological Processes ◽  
Reef System ◽  
Nitrite Nitrate ◽  
Coral Reef System

Abstract. To investigate variations in nitrite, nitrate, phosphate and silicate in a spring-neap tide in a coral reef system influenced by groundwater discharge, we carried out a time-series observation of these nutrients and 228Ra, a tracer of groundwater discharge, in the Luhuitou fringing reef at Sanya Bay in the South China Sea. The maximum 228Ra, 45.28 dpm 100 L−1, appeared at a low tide and the minimum, 13.98 dpm 100 L−1, showed up during a flood tide in the spring tide. The activity of 228Ra was significantly correlated with water depth and salinity in the spring-neap tide, reflecting the tidal-pumping feature of groundwater discharge. Concentrations of all nutrients exhibited strong diurnal variations under the combined influence of mixing of groundwater and offshore water and biological uptake and release. The amplitude of the diel change reached a maximum for nitrite, nitrate, phosphate and silicate in the spring tide, 0.46 uM, 1.54 uM, 0.12 uM, and 2.68 uM, respectively. Nitrate and phosphate were negatively correlated with water depth during the spring tide, but showed no correlation during the neap tide. Nitrite was positively correlated with water depth in the spring and neap tide. They were also significantly correlated with salinity at the ebb flow of the spring tide. We quantified variations in oxidized nitrogen (NOx) and phosphate contributed by biological processes based on mixing lines of these nutrients. During both the spring and neap tide biologically contributed NOx and phosphate were significantly correlated with regression slopes of 4.60 in the spring tide and 13.37 in the neap tide, similar to the composition of these nutrients in the water column, 5.43 and 14.18, respectively. This similarity indicates that the composition of nutrients in the water column of the reef system was closely related with biological processes during both tidal periods, but the biological influence appeared to be less as inferred from the less significant correlations during the spring tide when groundwater discharge was more prominent.

Submarine Groundwater Discharge Releases CO2 to a Coral Reef

2021 ◽  
Author(s):  
Rogger E. Correa ◽  
M. Bayani Cardenas ◽  
Raymond S. Rodolfo ◽  
Mark R. Lapus ◽  
Kay L. Davis ◽  
...  
Keyword(s):  
Coral Reef ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Submarine Groundwater

Estimating submarine groundwater discharge in a South Pacific coral reef lagoon using different radioisotope and geophysical approaches

2013 ◽  
Vol 156 ◽  
pp. 49-60 ◽  
Author(s):  
Douglas R. Tait ◽  
Isaac R. Santos ◽  
Dirk V. Erler ◽  
Kevin M. Befus ◽  
M. Bayani Cardenas ◽  
...  
Keyword(s):  
Coral Reef ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
South Pacific ◽  
Reef Lagoon ◽  
Submarine Groundwater ◽  
Coral Reef Lagoon

Nutrient dynamics in submarine groundwater discharge through a coral reef (western Lombok, Indonesia)

2019 ◽  
Vol 64 (6) ◽  
pp. 2646-2661 ◽  
Author(s):  
Till Oehler ◽  
Hendra Bakti ◽  
Rachmat Fajar Lubis ◽  
Ananta Purwoarminta ◽  
Robert Delinom ◽  
...  
Keyword(s):  
Coral Reef ◽  
Submarine Groundwater Discharge ◽  
Nutrient Dynamics ◽  
Groundwater Discharge ◽  
Submarine Groundwater

scholarly journals Submarine groundwater discharge alters coral reef ecosystem metabolism

2020 ◽  
Vol 287 (1941) ◽  
pp. 20202743
Author(s):  
Nyssa J. Silbiger ◽  
Megan J. Donahue ◽  
Katie Lubarsky
Keyword(s):  
Coral Reef ◽  
Submarine Groundwater Discharge ◽  
Structural Equation ◽  
Groundwater Discharge ◽  
High Tide ◽  
Ecosystem Metabolism ◽  
Coral Reef Ecosystem ◽  
Submarine Groundwater ◽  
Coral Reef Ecosystems ◽  
Reef Ecosystem

Submarine groundwater discharge (SGD) influences near-shore coral reef ecosystems worldwide. SGD biogeochemistry is distinct, typically with higher nutrients, lower pH, cooler temperature and lower salinity than receiving waters. SGD can also be a conduit for anthropogenic nutrients and other pollutants. Using Bayesian structural equation modelling, we investigate pathways and feedbacks by which SGD influences coral reef ecosystem metabolism at two Hawai'i sites with distinct aquifer chemistry. The thermal and biogeochemical environment created by SGD changed net ecosystem production (NEP) and net ecosystem calcification (NEC). NEP showed a nonlinear relationship with SGD-enhanced nutrients: high fluxes of moderately enriched SGD (Wailupe low tide) and low fluxes of highly enriched SGD (Kūpikipiki'ō high tide) increased NEP, but high fluxes of highly enriched SGD (Kūpikipiki'ō low tide) decreased NEP, indicating a shift toward microbial respiration. pH fluctuated with NEP, driving changes in the net growth of calcifiers (NEC). SGD enhances biological feedbacks: changes in SGD from land use and climate change will have consequences for calcification of coral reef communities, and thereby shoreline protection.

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