Journal article
Seasonal and temporal CO2 dynamics in three tropical mangrove creeks – A revision of global mangrove CO2 emissions
Geochimica et Cosmochimica Acta, Vol.222, pp.729-745
01/02/2018
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Source: InCites
Abstract
Continuous high-resolution surface water pCO2 and δ13C-CO2 and 222Rn (dry season only) were measured over two tidal cycles in the wet and dry season in three tropical tidal mangrove creeks on the north-eastern coast of Queensland, Australia. Mangrove surface water pCO2 followed a clear tidal pattern (ranging from 387 to 13,031 µatm) with higher pCO2-values in the wet season than in the dry season. The δ13C-CO2 in the mangrove waters ranged from −21.7 to −8.8‰ and was rather indicative of a mixed source than a distinct mangrove signature. Surface water CO2 was likely driven by a combination of mangrove and external carbon sources, e.g. exchange with groundwater/pore water enriched in 13C, or terrestrial carbon inputs with a significant contribution of C4-vegetation (sugar cane) source. The kinetic and equilibrium fractionation during the gas exchange at the water-atmosphere interface may have further caused a 13C-enrichment of the CO2 pool in the mangrove surface waters. Average CO2 evasion rates (58.7–277.6 mmol m−2 d−1) were calculated using different empirical gas transfer velocity models. Using our high-resolution time series data and previously published data, the average CO2 flux rate in mangrove ecosystems was estimated to be 56.5 ± 8.9 mmol m−2 d−1, which corresponds to a revised global mangrove CO2 emission of 34.1 ± 5.4 Tg C per year.
Details
- Title
- Seasonal and temporal CO2 dynamics in three tropical mangrove creeks – A revision of global mangrove CO2 emissions
- Creators
- Judith A Rosentreter - Southern Cross UniversityD T Maher - Southern Cross UniversityD V Erler - Southern Cross UniversityR Murray - Southern Cross UniversityB D Eyre - Southern Cross University
- Publication Details
- Geochimica et Cosmochimica Acta, Vol.222, pp.729-745
- Publisher
- Elsevier Ltd
- Grant note
- The manuscript was greatly improved by addressing the constructive comments of two anonymous reviewers and the Associated Editor. This project was funded by the Great Barrier Reef Foundation’s Resilient Coral Reefs Successfully Adapting to Climate Change research and development program in collaboration with the Australian Government, and by Australian Research Council Grants DE150100581, DP160100248, and LP150100519.
- Identifiers
- 991012831987602368
- Copyright
- © 2017 Elsevier Ltd. All rights reserved.
- Academic Unit
- Science; Faculty of Science and Engineering; Centre for Coastal Biogeochemistry; National Marine Science Centre; School of Environment, Science and Engineering
- Language
- English
- Resource Type
- Journal article