DOI: 10.1002/2013GB004598
Scopus记录号: 2-s2.0-84899037556
论文题名: Drivers of pCO2 variability in two contrasting coral reef lagoons: The influence of submarine groundwater discharge
作者: Cyronak T ; , Santos I ; R ; , Erler D ; V ; , Maher D ; T ; , Eyre B ; D
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 4 起始页码: 398
结束页码: 414
语种: 英语
英文关键词: coral reef
; groundwater
; ocean acidification
; pCO2
; radon
; SGD
Scopus关键词: Acidification
; Biomineralization
; Bone
; Carbon dioxide
; Lakes
; Radon
; Reefs
; Biological process
; Coral reef
; Great Barrier Reef
; Hydraulic gradients
; Ocean acidifications
; pCO2
; SGD
; Submarine groundwater discharge
; Groundwater
; carbon dioxide
; coastal lagoon
; coral reef
; groundwater flow
; marine sediment
; sediment chemistry
; volcanic island
; water column
; Pacific Ocean
; Pacific Ocean (South)
; Anthozoa
英文摘要: The impact of groundwater on pCO2 variability was assessed in two coral reef lagoons with distinct drivers of submarine groundwater discharge (SGD). Diel variability of pCO2 in the two ecosystems was explained by a combination of biological drivers and SGD inputs. In Rarotonga, a South Pacific volcanic island, 222Rn-derived SGD was driven primarily by a steep terrestrial hydraulic gradient, and the water column was influenced by the high pCO2 (5501 μatm) of the fresh groundwater. In Heron Island, a Great Barrier Reef coral cay, SGD was dominated by seawater recirculation through the sediments (i.e., tidal pumping), and pCO2 was mainly impacted through the stimulation of biological processes. The Rarotonga water column had a higher average pCO2 (549 μatm) than Heron Island (471 μatm). However, pCO2 exhibited a greater diel range in Heron Island (778 μatm) than in Rarotonga (507 μatm). The Rarotonga water column received 29.0 ± 8.2 mmol free-CO2 m-2 d -1 from SGD, while the Heron Island water column received 12.1 ± 4.2 mmol free-CO2 m-2 d-1. Over the course of this study, both systems were sources of CO2 to the atmosphere with SGD-derived free-CO2 most likely contributing a large portion to the air-sea CO2 flux. Studies measuring the carbon chemistry of coral reefs (e.g., metabolism and calcification rates) may need to consider the effects of groundwater inputs on water column carbonate chemistry. Local drivers of coral reef carbonate chemistry such as SGD may offer more approachable management solutions to mitigating the effects of ocean acidification on coral reefs. Key Points Groundwater can influence pCO 2 variability in coral reefs Submarine groundwater discharge may enhance local ocean acidification Measurements of net community calcification can be influenced by groundwater ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77499
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, Lismore NSW, Australia
Recommended Citation:
Cyronak T,, Santos I,R,et al. Drivers of pCO2 variability in two contrasting coral reef lagoons: The influence of submarine groundwater discharge[J]. Global Biogeochemical Cycles,2014-01-01,28(4)