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Temporal variation of dissolved methane in a subtropical mesoscale eddy during a phytoplankton bloom in the southwest Pacific Ocean


Weller, DI and Law, CS and Marriner, A and Nodder, SD and Chang, FH and Stephens, JA and Wilhelm, SW and Boyd, PW and Sutton, PJH, Temporal variation of dissolved methane in a subtropical mesoscale eddy during a phytoplankton bloom in the southwest Pacific Ocean, Progress in Oceanography, 116 pp. 193-206. ISSN 0079-6611 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier

DOI: doi:10.1016/j.pocean.2013.07.008


A multi-disciplinary examination of the drivers of dissolved methane was carried out during a phytoplankton bloom located in a subtropical mesoscale eddy. This investigation related temporal signals in methane concentrations with other biophysical and biogeochemical parameters in the upper waters (<300m) of the southwest Pacific Ocean. In the surface mixed layer, methane supersaturation increased and δ13CCH4 became more depleted coincident with increases in particulate dimethylsulfoniopropionate (DMSPp) and succession from the diatom Asterionellopsis glacialis to the nanoflagellate Phaeocystis globosa and the cyanobacterium Synechococcus sp. In situ methane production was calculated in a surface mixed layer methane budget that incorporated sea-to-air exchange and vertical diffusion. Methane concentrations increased in and below the mixed layer when the export of biogenic particles increased. Increased grazing of microbes by microzooplankton may have contributed to particle recycling (rich in organic carbon and DMSP) and increased the potential for methanogenesis. Phytoplankton species composition and biomass in different bloom phases, and eddy dynamics, were important determinants of methane saturation and emission, and the potential implications for methane are considered for the future surface ocean.

Item Details

Item Type:Refereed Article
Keywords:dimethylsulfoniopropionate, methane concentrations, methane production, particle recycling. phaeocystis globosa, phytoplankton bloom, phytoplankton species, surface mixed layers
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Air quality
UTAS Author:Boyd, PW (Professor Philip Boyd)
ID Code:91754
Year Published:2013
Web of Science® Times Cited:16
Deposited By:IMAS Research and Education Centre
Deposited On:2014-05-29
Last Modified:2017-11-01

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