Spatial and temporal variability of biogenic isoprene emissions from a temperate estuary

Exton, DA; Suggett, DJ; Steinke, M; McGenity, TJ

Spatial and temporal variability of biogenic isoprene emissions from a temperate estuary

Exton, DA Suggett, DJ

Steinke, M McGenity, TJ

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Publication Type:: Journal Article
Citation:: Global Biogeochemical Cycles, 2012, 26 (2)
Issue Date:: 2012-05-22

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Field	Value	Language
dc.contributor.author	Exton, DA	en_US
dc.contributor.author	Suggett, DJ https://orcid.org/0000-0001-5326-2520	en_US
dc.contributor.author	Steinke, M	en_US
dc.contributor.author	McGenity, TJ	en_US
dc.date.issued	2012-05-22	en_US
dc.identifier.citation	Global Biogeochemical Cycles, 2012, 26 (2)	en_US
dc.identifier.issn	0886-6236	en_US
dc.identifier.uri	http://hdl.handle.net/10453/28763
dc.description.abstract	Isoprene is important for its atmospheric impacts and the ecophysiological benefits it affords to emitting organisms; however, isoprene emissions from marine systems remain vastly understudied compared to terrestrial systems. This study investigates for the first time drivers of isoprene production in a temperate estuary, and the role this production may play in enabling organisms to tolerate the inherently wide range of environmental conditions. Intertidal sediment cores as well as high and low tide water samples were collected from four sites along the Colne Estuary, UK, every six weeks over a year. Isoprene concentrations in the water were significantly higher at low than high tide, and decreased toward the mouth of the estuary; sediment production showed no spatial variability. Diel isoprene concentration increased with light availability and decreased with tidal height; nighttime production was 79% lower than daytime production. Seasonal isoprene production and water concentrations were highest for the warmest months, with production strongly correlated with light (r2=0.800) and temperature (r2=0.752). Intertidal microphytobenthic communities were found to be the primary source of isoprene, with tidal action acting as a concentrating factor for isoprene entering the water column. Using these data we estimated an annual production rate for this estuary of 681 mol m-2 y-1. This value falls at the upper end of other marine estimates and highlights the potentially significant role of estuaries as isoprene sources. The control of estuarine isoprene production by environmental processes identified here further suggests that such emissions may be altered by future environmental change. © 2012 by the American Geophysical Union.	en_US
dc.relation.ispartof	Global Biogeochemical Cycles	en_US
dc.relation.isbasedon	10.1029/2011GB004210	en_US
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.title	Spatial and temporal variability of biogenic isoprene emissions from a temperate estuary	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	26	en_US
utslib.for	0402 Geochemistry	en_US
utslib.for	0401 Atmospheric Sciences	en_US
utslib.for	0405 Oceanography	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	26	en_US

Abstract:

Isoprene is important for its atmospheric impacts and the ecophysiological benefits it affords to emitting organisms; however, isoprene emissions from marine systems remain vastly understudied compared to terrestrial systems. This study investigates for the first time drivers of isoprene production in a temperate estuary, and the role this production may play in enabling organisms to tolerate the inherently wide range of environmental conditions. Intertidal sediment cores as well as high and low tide water samples were collected from four sites along the Colne Estuary, UK, every six weeks over a year. Isoprene concentrations in the water were significantly higher at low than high tide, and decreased toward the mouth of the estuary; sediment production showed no spatial variability. Diel isoprene concentration increased with light availability and decreased with tidal height; nighttime production was 79% lower than daytime production. Seasonal isoprene production and water concentrations were highest for the warmest months, with production strongly correlated with light (r2=0.800) and temperature (r2=0.752). Intertidal microphytobenthic communities were found to be the primary source of isoprene, with tidal action acting as a concentrating factor for isoprene entering the water column. Using these data we estimated an annual production rate for this estuary of 681 mol m-2 y-1. This value falls at the upper end of other marine estimates and highlights the potentially significant role of estuaries as isoprene sources. The control of estuarine isoprene production by environmental processes identified here further suggests that such emissions may be altered by future environmental change. © 2012 by the American Geophysical Union.

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http://hdl.handle.net/10453/28763