Conference presentation
Spatial and temporal variability of CO2 and CH4 gas transfer velocities in mangrove dominated estuaries.
V. M. Goldschmidt Conference, 26th (Yokohama, Japan, 26/06/2016 - 01/07/2016)
01/07/2016
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Abstract
Gas exchange fluxes of CO2 and CH4 in mangrove estuaries are an important component of the coastal carbon cycle. The highest uncertainty in the flux computation, however, remains in the estimate of the gas transfer velocity (k), which is system specific.
Gas transfer velocities of CO2 (kCO2) and CH4 (kCH4) were calculated from 215 floating chamber deployments in mangrove dominated estuaries in Australia and the Everglades, USA. High temporal and spatial variability of kCO2 and kCH4 was found (0.9 to 28.3 cm h-1 ), mainly controlled by current generated turbulence.
A direct comparison of measurement pairs showed kCH4 was on average 1.2 times higher than kCO2, most likely reflecting a microbubble flux, which contributed up to 73 % of the total CH4 flux. The potential for underestimating CH4 evasion rates due to the presence of a microbubble flux contribution should be considered in future CH4 flux studies, especially in ecosystems with high CH4 saturation levels.
Details
- Title
- Spatial and temporal variability of CO2 and CH4 gas transfer velocities in mangrove dominated estuaries.
- Creators
- J A Rosentreter - Southern Cross UniversityD T Maher - Southern Cross UniversityD T Ho - University of Hawaii at HiloM Call - Southern Cross UniversityJ G Barr - South Florida Natural Resources CenterB D Eyre - Southern Cross University
- Conference
- V. M. Goldschmidt Conference, 26th (Yokohama, Japan, 26/06/2016 - 01/07/2016)
- Identifiers
- 991012845997002368
- Academic Unit
- Faculty of Science and Engineering; Centre for Coastal Biogeochemistry; School of Environment, Science and Engineering; Science
- Resource Type
- Conference presentation