A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon

In contrast to other seagrass meadows where seawater carbonate chemistry generally shows strong diel variations with higher pH but lower partial pressure of CO2 (pCO2) during the daytime and lower pH but higher pCO2 during nighttime due to the alternation in photosynthesis and respiration, the seagr...

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Autores principales:	Wen-Chen Chou, Lan-Feng Fan, Chang-Chang Yang, Ying-Hsuan Chen, Chin-Chang Hung, Wei-Jen Huang, Yung-Yen Shih, Keryea Soong, Hsiao-Chun Tseng, Gwo-Ching Gong, Hung-Yu Chen, Cheng-Kuan Su
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	alkalinity production carbonate dissolution seagrass Dongsha Island blue carbon ocean acidification Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/a0c41b841dd543e494aa3e731ab13392
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spelling	oai:doaj.org-article:a0c41b841dd543e494aa3e731ab133922021-11-11T05:40:16ZA Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon2296-774510.3389/fmars.2021.717685https://doaj.org/article/a0c41b841dd543e494aa3e731ab133922021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.717685/fullhttps://doaj.org/toc/2296-7745In contrast to other seagrass meadows where seawater carbonate chemistry generally shows strong diel variations with higher pH but lower partial pressure of CO2 (pCO2) during the daytime and lower pH but higher pCO2 during nighttime due to the alternation in photosynthesis and respiration, the seagrass meadows of the inner lagoon (IL) on Dongsha Island had a unique diel pattern with extremely high pH and low pCO2 across a diel cycle. We suggest that this distinct diel pattern in pH and pCO2 could be associated with the enhancement of total alkalinity (TA) production coupled to carbonate sediment dissolution in a semienclosed lagoon. The confinement of the IL may hamper water exchange and seagrass detritus export to the adjacent open ocean, which may result in higher organic matter loading to the sediments, and longer residence time of the water in the IL, accompanied by microbial respiration (both aerobic and anaerobic) that may reduce carbonate saturation level to drive carbonate dissolution and thus TA elevation, thereby forming such a unique diel pattern in carbonate chemistry. This finding further highlights the importance of considering TA production through metabolic carbonate dissolution when evaluating the potential of coastal blue carbon ecosystems to buffer ocean acidification and to absorb atmospheric CO2, in particular in a semienclosed setting.Wen-Chen ChouWen-Chen ChouLan-Feng FanChang-Chang YangYing-Hsuan ChenChin-Chang HungWei-Jen HuangYung-Yen ShihYung-Yen ShihKeryea SoongHsiao-Chun TsengGwo-Ching GongGwo-Ching GongHung-Yu ChenCheng-Kuan SuFrontiers Media S.A.articlealkalinity productioncarbonate dissolutionseagrassDongsha Islandblue carbonocean acidificationScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	alkalinity production carbonate dissolution seagrass Dongsha Island blue carbon ocean acidification Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	alkalinity production carbonate dissolution seagrass Dongsha Island blue carbon ocean acidification Science Q General. Including nature conservation, geographical distribution QH1-199.5 Wen-Chen Chou Wen-Chen Chou Lan-Feng Fan Chang-Chang Yang Ying-Hsuan Chen Chin-Chang Hung Wei-Jen Huang Yung-Yen Shih Yung-Yen Shih Keryea Soong Hsiao-Chun Tseng Gwo-Ching Gong Gwo-Ching Gong Hung-Yu Chen Cheng-Kuan Su A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon
description	In contrast to other seagrass meadows where seawater carbonate chemistry generally shows strong diel variations with higher pH but lower partial pressure of CO2 (pCO2) during the daytime and lower pH but higher pCO2 during nighttime due to the alternation in photosynthesis and respiration, the seagrass meadows of the inner lagoon (IL) on Dongsha Island had a unique diel pattern with extremely high pH and low pCO2 across a diel cycle. We suggest that this distinct diel pattern in pH and pCO2 could be associated with the enhancement of total alkalinity (TA) production coupled to carbonate sediment dissolution in a semienclosed lagoon. The confinement of the IL may hamper water exchange and seagrass detritus export to the adjacent open ocean, which may result in higher organic matter loading to the sediments, and longer residence time of the water in the IL, accompanied by microbial respiration (both aerobic and anaerobic) that may reduce carbonate saturation level to drive carbonate dissolution and thus TA elevation, thereby forming such a unique diel pattern in carbonate chemistry. This finding further highlights the importance of considering TA production through metabolic carbonate dissolution when evaluating the potential of coastal blue carbon ecosystems to buffer ocean acidification and to absorb atmospheric CO2, in particular in a semienclosed setting.
format	article
author	Wen-Chen Chou Wen-Chen Chou Lan-Feng Fan Chang-Chang Yang Ying-Hsuan Chen Chin-Chang Hung Wei-Jen Huang Yung-Yen Shih Yung-Yen Shih Keryea Soong Hsiao-Chun Tseng Gwo-Ching Gong Gwo-Ching Gong Hung-Yu Chen Cheng-Kuan Su
author_facet	Wen-Chen Chou Wen-Chen Chou Lan-Feng Fan Chang-Chang Yang Ying-Hsuan Chen Chin-Chang Hung Wei-Jen Huang Yung-Yen Shih Yung-Yen Shih Keryea Soong Hsiao-Chun Tseng Gwo-Ching Gong Gwo-Ching Gong Hung-Yu Chen Cheng-Kuan Su
author_sort	Wen-Chen Chou
title	A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon
title_short	A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon
title_full	A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon
title_fullStr	A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon
title_full_unstemmed	A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon
title_sort	unique diel pattern in carbonate chemistry in the seagrass meadows of dongsha island: the enhancement of metabolic carbonate dissolution in a semienclosed lagoon
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/a0c41b841dd543e494aa3e731ab13392
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A Unique Diel Pattern in Carbonate Chemistry in the Seagrass Meadows of Dongsha Island: The Enhancement of Metabolic Carbonate Dissolution in a Semienclosed Lagoon

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