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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50218

Title: Short-term variability of carbon chemistry in two contrasting seagrass meadows at Dongsha Island: Implications for pH buffering and CO2 sequestration
Authors: Wen-Chen Chou
Hui-Chuan Chu
Ying-Hsuan Chen
Rong-Wei Syu
Chin-Chang Hung
Keryea Soong
Contributors: 國立臺灣海洋大學:海洋環境與生態研究所
Date: 2018-06
Issue Date: 2018-09-25T07:35:11Z
Publisher: Estuarine, Coastal and Shelf Science
Abstract: Abstract: The diurnal cycles of carbon chemistry parameters, i.e., dissolved inorganic carbon (DIC), total alkalinity (TA), partial pressure of CO2 (pCO2), and pH, were investigated in two hydrodynamically contrasting seagrass meadows at Dongsha Island in the northern South China Sea in August 2015. The results show that the pH and TA were higher and that the pCO2 was lower in the semi-enclosed inner lagoon (IL) than on the open north shore (NS). The analyses of carbon chemistry parameters vs. dissolved oxygen and TA vs. DIC relationships reveal that the CO2 dynamics was dominated by photosynthesis/respiration (P/R) alone on the NS but by the combined effect of P/R and sedimentary anaerobic pathways in the IL. We suggest that the observed divergent behaviors in carbon chemistry between the two sites could be attributed to differences in hydrodynamic regimes. The less energetic hydrodynamics and longer residence time in the IL would be favorable for the occurrence of sedimentary anaerobic TA generation and the subsequent TA accumulation in the overlying waters. The elevated TA may lead to a pH increase and a pCO2 decrease, thus providing a buffering effect against ocean acidification (OA) and enhancing atmospheric CO2 sequestration at local scales. The present results demonstrate that hydrodynamic regime may play an important role in regulating biogeochemical processes in seagrass meadows, and thereby modulating their capacities in OA buffering and CO2 uptaking.
Relation: 210 pp.36-44
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50218
Appears in Collections:[Institute of Marine Environment and Ecology] Periodical Articles

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