Journal article
Dimethylsulfide (DMS) fluxes from permeable coral reef carbonate sediments
Marine Chemistry, Vol.208, pp.1-10
2019
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Abstract
Dimethylsulfide (DMS) is a biogenic volatile organic compound of high interest as it can influence the Earth's 10 climate by contributing to cloud formation in the atmosphere. Although DMS occurs at high concentrations in 11 coral reef ecosystems, the role of permeable coral reef carbonate sediments as a source and sink of DMS to the 12 surrounding seawater is unknown. Here, we report for the first time fluxes of dissolved DMS from permeable 13 coral reef carbonate sediments over a full diel cycle obtained from benthic chamber deployments on the reef flat 14 of Heron Island, southern Great Barrier Reef. Carbonate coral reef sediments were a substantial net diel source of 15 DMS to the water column (mean 85.4 ± 13.2; range 42.3 ± 5.1 to 114 ± 4.7 nmol m-2 h-1), with rates similar to 16 saltmarsh sediments. DMS effluxes were higher in the light under advective porewater flow, suggesting that DMS 17 production in carbonate coral reef sediments is associated with photosynthesis by benthic microalgae. However, 18 DMS effluxes decreased with advection at night, suggesting either greater DMS consumption or less DMS 19 production under dark conditions. Similarly, dimethylsulfoniopropionate (DMSP), which is generally considered 20 the main precursor of DMS, was mainly produced during the day. Net and dark methane (CH4) effluxes negatively 21 correlated with net DMSP and dark DMS fluxes, respectively; suggesting that CH4 production via methanogenesis 22 could be a sink for DMS and DMSP in carbonate coral reef sediments, especially under dark anoxic conditions. 23 On Heron Island the permeable sands were estimated to contribute from about 22% to 44% of the benthic DMS 24 emitted from the reef to the water column, which could represent an important portion of the yearly sea-to-25 atmosphere DMS fluxes. Permeable carbonate sediments should be considered further as a source of benthic DMS 26 emitted from coral reefs and the broader continental shelf.
Details
- Title
- Dimethylsulfide (DMS) fluxes from permeable coral reef carbonate sediments
- Creators
- Elisabeth Deschaseaux (Corresponding Author) - Southern Cross UniversityLaura Stoltenberg - Southern Cross UniversityVictoria Hrebien - Southern Cross UniversityEdwin P Koveke - Kumamoto UniversityKei Toda - Kumamoto UniversityBradley D Eyre - Southern Cross University
- Publication Details
- Marine Chemistry, Vol.208, pp.1-10
- Publisher
- Elsevier
- Grants
- Dissolution of calcium carbonate in sediments in an acidifying ocean, DP150102092, Australian Research Council
- Identifiers
- 991012882198602368
- Copyright
- © 2018 Elsevier B.V.
- Academic Unit
- Faculty of Science and Engineering; Centre for Coastal Biogeochemistry; School of Environment, Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article