Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam)

Pierre Taillardat (Corresponding Author), Pim Wilhelmus Johannes Maria Willemsen, Cyril Marchand, D.A. Friess, David Widory, Paul Baudron, Van Vinh Truong, Thanh-Nho Nguyễn, Alan D. Ziegler

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

Although mangrove forests are efficient natural carbon sinks, most of the atmospheric carbon dioxide (CO2) fixed by its vegetation is believed to be exported via tidal exchange, rather than stored in the vegetative biomass and sediment. However, the magnitude of tidal export is largely unknown because direct measurements are scarce. We deployed a novel experimental design that combined automated high-resolution measurements of hydrodynamic, hydrogeochemical and biogeochemical parameters during the dry season in a mangrove tidal creek in the Can Gio Mangrove Forest in Vietnam. The objective was to quantify the tide-controlled water, porewater, DIC and DOC exchange, and estimate the CO2 evasion throughout tidal cycles contrasted by amplitude. Data from three 25-h time series showed a clear peak of DIC, DOC, pCO2, and 222Rn at low tide, particularly during tidal cycles of large amplitude, which directly relate to porewater discharge. Our mass balance models revealed that the tidal creek was a net exporter of dissolved carbon to coastal waters, with an important contribution (38%) coming from DIC in porewater discharge. Porewater exchange varied from 3.1 ± 1.6 to 7.1 ± 2.4 cm day−1. DIC exchange ranged from 352 ± 34 to 678 ± 79 mmolC m−2 day−1; DOC exchange, 20.6 ± 1.9 to 67.7 ± 7.9 mmol C m−2 day−1; and CO2 evasion, 69.9 ± 10.5 to 173.7 ± 26.1 mmolC m−2 day−1. These estimates were in the high range of previous carbon assessments and were explained by (i) the monitoring station being located at equal distance from the head and the mouth of the creek, which minimized carbon degradation and losses associated to transport in water; and (ii) the site being a highly productive mangrove within South East Asia.
Original languageEnglish
Pages (from-to)303-318
Number of pages16
JournalJournal of hydrology
Volume563
DOIs
Publication statusPublished - 1 Aug 2018

Fingerprint

mangrove
porewater
carbon
tidal cycle
tide
carbon sink
experimental design
dry season
coastal water
mass balance
carbon dioxide
hydrodynamics
time series
water
degradation
creek
vegetation
biomass
sediment

Keywords

  • UT-Hybrid-D

Cite this

Taillardat, Pierre ; Willemsen, Pim Wilhelmus Johannes Maria ; Marchand, Cyril ; Friess, D.A. ; Widory, David ; Baudron, Paul ; Truong, Van Vinh ; Nguyễn, Thanh-Nho ; Ziegler, Alan D. / Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam). In: Journal of hydrology. 2018 ; Vol. 563. pp. 303-318.
@article{9ad0fdabfb094918b3efac0a205296fd,
title = "Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam)",
abstract = "Although mangrove forests are efficient natural carbon sinks, most of the atmospheric carbon dioxide (CO2) fixed by its vegetation is believed to be exported via tidal exchange, rather than stored in the vegetative biomass and sediment. However, the magnitude of tidal export is largely unknown because direct measurements are scarce. We deployed a novel experimental design that combined automated high-resolution measurements of hydrodynamic, hydrogeochemical and biogeochemical parameters during the dry season in a mangrove tidal creek in the Can Gio Mangrove Forest in Vietnam. The objective was to quantify the tide-controlled water, porewater, DIC and DOC exchange, and estimate the CO2 evasion throughout tidal cycles contrasted by amplitude. Data from three 25-h time series showed a clear peak of DIC, DOC, pCO2, and 222Rn at low tide, particularly during tidal cycles of large amplitude, which directly relate to porewater discharge. Our mass balance models revealed that the tidal creek was a net exporter of dissolved carbon to coastal waters, with an important contribution (38{\%}) coming from DIC in porewater discharge. Porewater exchange varied from 3.1 ± 1.6 to 7.1 ± 2.4 cm day−1. DIC exchange ranged from 352 ± 34 to 678 ± 79 mmolC m−2 day−1; DOC exchange, 20.6 ± 1.9 to 67.7 ± 7.9 mmol C m−2 day−1; and CO2 evasion, 69.9 ± 10.5 to 173.7 ± 26.1 mmolC m−2 day−1. These estimates were in the high range of previous carbon assessments and were explained by (i) the monitoring station being located at equal distance from the head and the mouth of the creek, which minimized carbon degradation and losses associated to transport in water; and (ii) the site being a highly productive mangrove within South East Asia.",
keywords = "UT-Hybrid-D",
author = "Pierre Taillardat and Willemsen, {Pim Wilhelmus Johannes Maria} and Cyril Marchand and D.A. Friess and David Widory and Paul Baudron and Truong, {Van Vinh} and Thanh-Nho Nguyễn and Ziegler, {Alan D.}",
note = "Elsevier deal",
year = "2018",
month = "8",
day = "1",
doi = "10.1016/j.jhydrol.2018.05.042",
language = "English",
volume = "563",
pages = "303--318",
journal = "Journal of hydrology",
issn = "0022-1694",
publisher = "Elsevier",

}

Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam). / Taillardat, Pierre (Corresponding Author); Willemsen, Pim Wilhelmus Johannes Maria; Marchand, Cyril; Friess, D.A.; Widory, David; Baudron, Paul; Truong, Van Vinh; Nguyễn, Thanh-Nho; Ziegler, Alan D.

In: Journal of hydrology, Vol. 563, 01.08.2018, p. 303-318.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam)

AU - Taillardat, Pierre

AU - Willemsen, Pim Wilhelmus Johannes Maria

AU - Marchand, Cyril

AU - Friess, D.A.

AU - Widory, David

AU - Baudron, Paul

AU - Truong, Van Vinh

AU - Nguyễn, Thanh-Nho

AU - Ziegler, Alan D.

N1 - Elsevier deal

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Although mangrove forests are efficient natural carbon sinks, most of the atmospheric carbon dioxide (CO2) fixed by its vegetation is believed to be exported via tidal exchange, rather than stored in the vegetative biomass and sediment. However, the magnitude of tidal export is largely unknown because direct measurements are scarce. We deployed a novel experimental design that combined automated high-resolution measurements of hydrodynamic, hydrogeochemical and biogeochemical parameters during the dry season in a mangrove tidal creek in the Can Gio Mangrove Forest in Vietnam. The objective was to quantify the tide-controlled water, porewater, DIC and DOC exchange, and estimate the CO2 evasion throughout tidal cycles contrasted by amplitude. Data from three 25-h time series showed a clear peak of DIC, DOC, pCO2, and 222Rn at low tide, particularly during tidal cycles of large amplitude, which directly relate to porewater discharge. Our mass balance models revealed that the tidal creek was a net exporter of dissolved carbon to coastal waters, with an important contribution (38%) coming from DIC in porewater discharge. Porewater exchange varied from 3.1 ± 1.6 to 7.1 ± 2.4 cm day−1. DIC exchange ranged from 352 ± 34 to 678 ± 79 mmolC m−2 day−1; DOC exchange, 20.6 ± 1.9 to 67.7 ± 7.9 mmol C m−2 day−1; and CO2 evasion, 69.9 ± 10.5 to 173.7 ± 26.1 mmolC m−2 day−1. These estimates were in the high range of previous carbon assessments and were explained by (i) the monitoring station being located at equal distance from the head and the mouth of the creek, which minimized carbon degradation and losses associated to transport in water; and (ii) the site being a highly productive mangrove within South East Asia.

AB - Although mangrove forests are efficient natural carbon sinks, most of the atmospheric carbon dioxide (CO2) fixed by its vegetation is believed to be exported via tidal exchange, rather than stored in the vegetative biomass and sediment. However, the magnitude of tidal export is largely unknown because direct measurements are scarce. We deployed a novel experimental design that combined automated high-resolution measurements of hydrodynamic, hydrogeochemical and biogeochemical parameters during the dry season in a mangrove tidal creek in the Can Gio Mangrove Forest in Vietnam. The objective was to quantify the tide-controlled water, porewater, DIC and DOC exchange, and estimate the CO2 evasion throughout tidal cycles contrasted by amplitude. Data from three 25-h time series showed a clear peak of DIC, DOC, pCO2, and 222Rn at low tide, particularly during tidal cycles of large amplitude, which directly relate to porewater discharge. Our mass balance models revealed that the tidal creek was a net exporter of dissolved carbon to coastal waters, with an important contribution (38%) coming from DIC in porewater discharge. Porewater exchange varied from 3.1 ± 1.6 to 7.1 ± 2.4 cm day−1. DIC exchange ranged from 352 ± 34 to 678 ± 79 mmolC m−2 day−1; DOC exchange, 20.6 ± 1.9 to 67.7 ± 7.9 mmol C m−2 day−1; and CO2 evasion, 69.9 ± 10.5 to 173.7 ± 26.1 mmolC m−2 day−1. These estimates were in the high range of previous carbon assessments and were explained by (i) the monitoring station being located at equal distance from the head and the mouth of the creek, which minimized carbon degradation and losses associated to transport in water; and (ii) the site being a highly productive mangrove within South East Asia.

KW - UT-Hybrid-D

U2 - 10.1016/j.jhydrol.2018.05.042

DO - 10.1016/j.jhydrol.2018.05.042

M3 - Article

VL - 563

SP - 303

EP - 318

JO - Journal of hydrology

JF - Journal of hydrology

SN - 0022-1694

ER -