Carbon dioxide and methane fluxes at the air–sea interface of Red Sea mangroves
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Marine Science Program
Red Sea Research Center (RSRC)
Permanent link to this recordhttp://hdl.handle.net/10754/628702
MetadataShow full item record
AbstractMangrove forests are highly productive tropical and subtropical coastal systems that provide a variety of ecosystem services, including the sequestration of carbon. While mangroves are reported to be the most intense carbon sinks among all forests, they can also support large emissions of greenhouse gases (GHGs), such as carbon dioxide (CO2) and methane (CH4), to the atmosphere. However, data derived from arid mangrove systems like the Red Sea are lacking. Here, we report net emission rates of CO2 and CH4 from mangroves along the eastern coast of the Red Sea and assess the relative role of these two gases in supporting total GHG emissions to the atmosphere. Diel CO2 and CH4 emission rates ranged from −3452 to 7500µmol CO2m−2d−1 and from 0.9 to 13.3µmol CH4m−2d−1 respectively. The rates reported here fall within previously reported ranges for both CO2 and CH4, but maximum CO2 and CH4 flux rates in the Red Sea are 10- to 100-fold below those previously reported for mangroves elsewhere. Based on the isotopic composition of the CO2 and CH4 produced, we identified potential origins of the organic matter that support GHG emissions. In all but one mangrove stand, GHG emissions appear to be supported by organic matter from mixed sources, potentially reducing CO2 fluxes and instead enhancing CH4 production, a finding that highlights the importance of determining the origin of organic matter in GHG emissions. Methane was the main source of CO2 equivalents despite the comparatively low emission rates in most of the sampled mangroves and therefore deserves careful monitoring in this region. By further resolving GHG fluxes in arid mangroves, we will better ascertain the role of these forests in global carbon budgets.
CitationSea MA, Garcias-Bonet N, Saderne V, Duarte CM (2018) Carbon dioxide and methane fluxes at the air–sea interface of Red Sea mangroves. Biogeosciences 15: 5365–5375. Available: http://dx.doi.org/10.5194/bg-15-5365-2018.
SponsorsThis research was funded by King Abdullah University of Science and Technology (KAUST) through baseline funding to Carlos M. Duarte. We thank Dorte Krause-Jensen, Nadia Salah Massoudi Ennasri, and Kimberly Baldry for help during sampling, and the captain and crew of KAUST R/V Thuwal for support. Mallory A. Sea was supported by King Abdullah University of Science and Technology through the VRSP programme. We thank Paloma Carrillo de Albornoz for lab instrument support, and Mongi Ennasri for help with sediment analysis.
RelationsIs Supplemented By:
Sea, M. A., Garcias-Bonet, N., Saderne, V., & Duarte, C. M. (2018). Carbon dioxide and methane fluxes at the air-sea interface of Red Sea mangroves, supplement to: Sea, Mallory A; Garcias-Bonet, Neus; Saderne, Vincent; Duarte, Carlos Manuel (2018): Carbon dioxide and methane fluxes at the air–sea interface of Red Sea mangroves. Biogeosciences, 15(17), 5365-5375. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.892847. DOI: 10.1594/PANGAEA.892847 Handle: 10754/663497
Except where otherwise noted, this item's license is described as This work is distributed under the Creative Commons Attribution 4.0 License.